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authorLinus Torvalds <torvalds@linux-foundation.org>2019-01-05 13:25:58 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-05 13:25:58 -0800
commit505b050fdf42097883b2d37b8e796e1f11dbef50 (patch)
tree21f5b43505a5771d13533ac675c785a9bf480fdc
parent9b286efeb5eb5aaa2712873fc1f928b2f879dbde (diff)
parent718c43038f287e843c2f63d946977de90014cb11 (diff)
downloadlinux-505b050fdf42097883b2d37b8e796e1f11dbef50.tar.gz
Merge branch 'mount.part1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs mount API prep from Al Viro: "Mount API prereqs. Mostly that's LSM mount options cleanups. There are several minor fixes in there, but nothing earth-shattering (leaks on failure exits, mostly)" * 'mount.part1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (27 commits) mount_fs: suppress MAC on MS_SUBMOUNT as well as MS_KERNMOUNT smack: rewrite smack_sb_eat_lsm_opts() smack: get rid of match_token() smack: take the guts of smack_parse_opts_str() into a new helper LSM: new method: ->sb_add_mnt_opt() selinux: rewrite selinux_sb_eat_lsm_opts() selinux: regularize Opt_... names a bit selinux: switch away from match_token() selinux: new helper - selinux_add_opt() LSM: bury struct security_mnt_opts smack: switch to private smack_mnt_opts selinux: switch to private struct selinux_mnt_opts LSM: hide struct security_mnt_opts from any generic code selinux: kill selinux_sb_get_mnt_opts() LSM: turn sb_eat_lsm_opts() into a method nfs_remount(): don't leak, don't ignore LSM options quietly btrfs: sanitize security_mnt_opts use selinux; don't open-code a loop in sb_finish_set_opts() LSM: split ->sb_set_mnt_opts() out of ->sb_kern_mount() new helper: security_sb_eat_lsm_opts() ...
-rw-r--r--arch/arc/kernel/setup.c1
-rw-r--r--arch/arm/kernel/atags_parse.c1
-rw-r--r--arch/sh/kernel/setup.c1
-rw-r--r--arch/sparc/kernel/setup_32.c1
-rw-r--r--arch/sparc/kernel/setup_64.c1
-rw-r--r--arch/x86/kernel/setup.c1
-rw-r--r--drivers/base/devtmpfs.c1
-rw-r--r--fs/btrfs/ctree.h4
-rw-r--r--fs/btrfs/super.c82
-rw-r--r--fs/exofs/super.c37
-rw-r--r--fs/namespace.c156
-rw-r--r--fs/nfs/internal.h2
-rw-r--r--fs/nfs/super.c34
-rw-r--r--fs/pnode.c1
-rw-r--r--fs/super.c24
-rw-r--r--include/linux/lsm_hooks.h17
-rw-r--r--include/linux/mount.h2
-rw-r--r--include/linux/security.h82
-rw-r--r--include/uapi/linux/fs.h56
-rw-r--r--include/uapi/linux/mount.h58
-rw-r--r--init/do_mounts.c1
-rw-r--r--init/do_mounts_initrd.c1
-rw-r--r--security/apparmor/lsm.c1
-rw-r--r--security/apparmor/mount.c1
-rw-r--r--security/security.c39
-rw-r--r--security/selinux/hooks.c799
-rw-r--r--security/smack/smack_lsm.c359
-rw-r--r--security/tomoyo/mount.c1
28 files changed, 724 insertions, 1040 deletions
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index eea8c5ce6335..2e018b8c2e19 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -19,6 +19,7 @@
#include <linux/of_fdt.h>
#include <linux/of.h>
#include <linux/cache.h>
+#include <uapi/linux/mount.h>
#include <asm/sections.h>
#include <asm/arcregs.h>
#include <asm/tlb.h>
diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c
index c10a3e8ee998..a8a4333929f5 100644
--- a/arch/arm/kernel/atags_parse.c
+++ b/arch/arm/kernel/atags_parse.c
@@ -24,6 +24,7 @@
#include <linux/root_dev.h>
#include <linux/screen_info.h>
#include <linux/memblock.h>
+#include <uapi/linux/mount.h>
#include <asm/setup.h>
#include <asm/system_info.h>
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index c286cf5da6e7..2c0e0f37a318 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -32,6 +32,7 @@
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/uaccess.h>
+#include <uapi/linux/mount.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/elf.h>
diff --git a/arch/sparc/kernel/setup_32.c b/arch/sparc/kernel/setup_32.c
index 3fd238e54af9..afe1592a6d08 100644
--- a/arch/sparc/kernel/setup_32.c
+++ b/arch/sparc/kernel/setup_32.c
@@ -34,6 +34,7 @@
#include <linux/kdebug.h>
#include <linux/export.h>
#include <linux/start_kernel.h>
+#include <uapi/linux/mount.h>
#include <asm/io.h>
#include <asm/processor.h>
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index ecc788aa07bd..51c4d12c0853 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -33,6 +33,7 @@
#include <linux/module.h>
#include <linux/start_kernel.h>
#include <linux/memblock.h>
+#include <uapi/linux/mount.h>
#include <asm/io.h>
#include <asm/processor.h>
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index d494b9bfe618..3d872a527cd9 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -50,6 +50,7 @@
#include <linux/kvm_para.h>
#include <linux/dma-contiguous.h>
#include <xen/xen.h>
+#include <uapi/linux/mount.h>
#include <linux/errno.h>
#include <linux/kernel.h>
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index b93fc862d365..0dbc43068eeb 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -25,6 +25,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/kthread.h>
+#include <uapi/linux/mount.h>
#include "base.h"
static struct task_struct *thread;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f031a447a047..0a68cf7032f5 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1144,9 +1144,6 @@ struct btrfs_fs_info {
struct mutex unused_bg_unpin_mutex;
struct mutex delete_unused_bgs_mutex;
- /* For btrfs to record security options */
- struct security_mnt_opts security_opts;
-
/*
* Chunks that can't be freed yet (under a trim/discard operation)
* and will be latter freed. Protected by fs_info->chunk_mutex.
@@ -3021,7 +3018,6 @@ static inline void free_fs_info(struct btrfs_fs_info *fs_info)
kfree(fs_info->free_space_root);
kfree(fs_info->super_copy);
kfree(fs_info->super_for_commit);
- security_free_mnt_opts(&fs_info->security_opts);
kvfree(fs_info);
}
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 368a5b9e6c13..c5586ffd1426 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1458,56 +1458,6 @@ out:
return root;
}
-static int parse_security_options(char *orig_opts,
- struct security_mnt_opts *sec_opts)
-{
- char *secdata = NULL;
- int ret = 0;
-
- secdata = alloc_secdata();
- if (!secdata)
- return -ENOMEM;
- ret = security_sb_copy_data(orig_opts, secdata);
- if (ret) {
- free_secdata(secdata);
- return ret;
- }
- ret = security_sb_parse_opts_str(secdata, sec_opts);
- free_secdata(secdata);
- return ret;
-}
-
-static int setup_security_options(struct btrfs_fs_info *fs_info,
- struct super_block *sb,
- struct security_mnt_opts *sec_opts)
-{
- int ret = 0;
-
- /*
- * Call security_sb_set_mnt_opts() to check whether new sec_opts
- * is valid.
- */
- ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL);
- if (ret)
- return ret;
-
-#ifdef CONFIG_SECURITY
- if (!fs_info->security_opts.num_mnt_opts) {
- /* first time security setup, copy sec_opts to fs_info */
- memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts));
- } else {
- /*
- * Since SELinux (the only one supporting security_mnt_opts)
- * does NOT support changing context during remount/mount of
- * the same sb, this must be the same or part of the same
- * security options, just free it.
- */
- security_free_mnt_opts(sec_opts);
- }
-#endif
- return ret;
-}
-
/*
* Find a superblock for the given device / mount point.
*
@@ -1522,16 +1472,15 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
struct btrfs_device *device = NULL;
struct btrfs_fs_devices *fs_devices = NULL;
struct btrfs_fs_info *fs_info = NULL;
- struct security_mnt_opts new_sec_opts;
+ void *new_sec_opts = NULL;
fmode_t mode = FMODE_READ;
int error = 0;
if (!(flags & SB_RDONLY))
mode |= FMODE_WRITE;
- security_init_mnt_opts(&new_sec_opts);
if (data) {
- error = parse_security_options(data, &new_sec_opts);
+ error = security_sb_eat_lsm_opts(data, &new_sec_opts);
if (error)
return ERR_PTR(error);
}
@@ -1550,7 +1499,6 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
- security_init_mnt_opts(&fs_info->security_opts);
if (!fs_info->super_copy || !fs_info->super_for_commit) {
error = -ENOMEM;
goto error_fs_info;
@@ -1601,16 +1549,12 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
btrfs_sb(s)->bdev_holder = fs_type;
error = btrfs_fill_super(s, fs_devices, data);
}
+ if (!error)
+ error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL);
+ security_free_mnt_opts(&new_sec_opts);
if (error) {
deactivate_locked_super(s);
- goto error_sec_opts;
- }
-
- fs_info = btrfs_sb(s);
- error = setup_security_options(fs_info, s, &new_sec_opts);
- if (error) {
- deactivate_locked_super(s);
- goto error_sec_opts;
+ return ERR_PTR(error);
}
return dget(s->s_root);
@@ -1779,18 +1723,14 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
btrfs_remount_prepare(fs_info);
if (data) {
- struct security_mnt_opts new_sec_opts;
+ void *new_sec_opts = NULL;
- security_init_mnt_opts(&new_sec_opts);
- ret = parse_security_options(data, &new_sec_opts);
+ ret = security_sb_eat_lsm_opts(data, &new_sec_opts);
+ if (!ret)
+ ret = security_sb_remount(sb, new_sec_opts);
+ security_free_mnt_opts(&new_sec_opts);
if (ret)
goto restore;
- ret = setup_security_options(fs_info, sb,
- &new_sec_opts);
- if (ret) {
- security_free_mnt_opts(&new_sec_opts);
- goto restore;
- }
}
ret = btrfs_parse_options(fs_info, data, *flags);
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 906839a4da8f..fc80c7233fa5 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -705,21 +705,18 @@ out:
/*
* Read the superblock from the OSD and fill in the fields
*/
-static int exofs_fill_super(struct super_block *sb, void *data, int silent)
+static int exofs_fill_super(struct super_block *sb,
+ struct exofs_mountopt *opts,
+ struct exofs_sb_info *sbi,
+ int silent)
{
struct inode *root;
- struct exofs_mountopt *opts = data;
- struct exofs_sb_info *sbi; /*extended info */
struct osd_dev *od; /* Master device */
struct exofs_fscb fscb; /*on-disk superblock info */
struct ore_comp comp;
unsigned table_count;
int ret;
- sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
- if (!sbi)
- return -ENOMEM;
-
/* use mount options to fill superblock */
if (opts->is_osdname) {
struct osd_dev_info odi = {.systemid_len = 0};
@@ -863,7 +860,9 @@ static struct dentry *exofs_mount(struct file_system_type *type,
int flags, const char *dev_name,
void *data)
{
+ struct super_block *s;
struct exofs_mountopt opts;
+ struct exofs_sb_info *sbi;
int ret;
ret = parse_options(data, &opts);
@@ -872,9 +871,31 @@ static struct dentry *exofs_mount(struct file_system_type *type,
return ERR_PTR(ret);
}
+ sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
+ if (!sbi) {
+ kfree(opts.dev_name);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ s = sget(type, NULL, set_anon_super, flags, NULL);
+
+ if (IS_ERR(s)) {
+ kfree(opts.dev_name);
+ kfree(sbi);
+ return ERR_CAST(s);
+ }
+
if (!opts.dev_name)
opts.dev_name = dev_name;
- return mount_nodev(type, flags, &opts, exofs_fill_super);
+
+
+ ret = exofs_fill_super(s, &opts, sbi, flags & SB_SILENT ? 1 : 0);
+ if (ret) {
+ deactivate_locked_super(s);
+ return ERR_PTR(ret);
+ }
+ s->s_flags |= SB_ACTIVE;
+ return dget(s->s_root);
}
/*
diff --git a/fs/namespace.c b/fs/namespace.c
index 9b0140e7d8da..a677b59efd74 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -26,6 +26,7 @@
#include <linux/memblock.h>
#include <linux/task_work.h>
#include <linux/sched/task.h>
+#include <uapi/linux/mount.h>
#include "pnode.h"
#include "internal.h"
@@ -245,13 +246,9 @@ out_free_cache:
* mnt_want/drop_write() will _keep_ the filesystem
* r/w.
*/
-int __mnt_is_readonly(struct vfsmount *mnt)
+bool __mnt_is_readonly(struct vfsmount *mnt)
{
- if (mnt->mnt_flags & MNT_READONLY)
- return 1;
- if (sb_rdonly(mnt->mnt_sb))
- return 1;
- return 0;
+ return (mnt->mnt_flags & MNT_READONLY) || sb_rdonly(mnt->mnt_sb);
}
EXPORT_SYMBOL_GPL(__mnt_is_readonly);
@@ -507,11 +504,12 @@ static int mnt_make_readonly(struct mount *mnt)
return ret;
}
-static void __mnt_unmake_readonly(struct mount *mnt)
+static int __mnt_unmake_readonly(struct mount *mnt)
{
lock_mount_hash();
mnt->mnt.mnt_flags &= ~MNT_READONLY;
unlock_mount_hash();
+ return 0;
}
int sb_prepare_remount_readonly(struct super_block *sb)
@@ -2215,21 +2213,91 @@ out:
return err;
}
-static int change_mount_flags(struct vfsmount *mnt, int ms_flags)
+/*
+ * Don't allow locked mount flags to be cleared.
+ *
+ * No locks need to be held here while testing the various MNT_LOCK
+ * flags because those flags can never be cleared once they are set.
+ */
+static bool can_change_locked_flags(struct mount *mnt, unsigned int mnt_flags)
{
- int error = 0;
- int readonly_request = 0;
+ unsigned int fl = mnt->mnt.mnt_flags;
+
+ if ((fl & MNT_LOCK_READONLY) &&
+ !(mnt_flags & MNT_READONLY))
+ return false;
- if (ms_flags & MS_RDONLY)
- readonly_request = 1;
- if (readonly_request == __mnt_is_readonly(mnt))
+ if ((fl & MNT_LOCK_NODEV) &&
+ !(mnt_flags & MNT_NODEV))
+ return false;
+
+ if ((fl & MNT_LOCK_NOSUID) &&
+ !(mnt_flags & MNT_NOSUID))
+ return false;
+
+ if ((fl & MNT_LOCK_NOEXEC) &&
+ !(mnt_flags & MNT_NOEXEC))
+ return false;
+
+ if ((fl & MNT_LOCK_ATIME) &&
+ ((fl & MNT_ATIME_MASK) != (mnt_flags & MNT_ATIME_MASK)))
+ return false;
+
+ return true;
+}
+
+static int change_mount_ro_state(struct mount *mnt, unsigned int mnt_flags)
+{
+ bool readonly_request = (mnt_flags & MNT_READONLY);
+
+ if (readonly_request == __mnt_is_readonly(&mnt->mnt))
return 0;
if (readonly_request)
- error = mnt_make_readonly(real_mount(mnt));
- else
- __mnt_unmake_readonly(real_mount(mnt));
- return error;
+ return mnt_make_readonly(mnt);
+
+ return __mnt_unmake_readonly(mnt);
+}
+
+/*
+ * Update the user-settable attributes on a mount. The caller must hold
+ * sb->s_umount for writing.
+ */
+static void set_mount_attributes(struct mount *mnt, unsigned int mnt_flags)
+{
+ lock_mount_hash();
+ mnt_flags |= mnt->mnt.mnt_flags & ~MNT_USER_SETTABLE_MASK;
+ mnt->mnt.mnt_flags = mnt_flags;
+ touch_mnt_namespace(mnt->mnt_ns);
+ unlock_mount_hash();
+}
+
+/*
+ * Handle reconfiguration of the mountpoint only without alteration of the
+ * superblock it refers to. This is triggered by specifying MS_REMOUNT|MS_BIND
+ * to mount(2).
+ */
+static int do_reconfigure_mnt(struct path *path, unsigned int mnt_flags)
+{
+ struct super_block *sb = path->mnt->mnt_sb;
+ struct mount *mnt = real_mount(path->mnt);
+ int ret;
+
+ if (!check_mnt(mnt))
+ return -EINVAL;
+
+ if (path->dentry != mnt->mnt.mnt_root)
+ return -EINVAL;
+
+ if (!can_change_locked_flags(mnt, mnt_flags))
+ return -EPERM;
+
+ down_write(&sb->s_umount);
+ ret = change_mount_ro_state(mnt, mnt_flags);
+ if (ret == 0)
+ set_mount_attributes(mnt, mnt_flags);
+ up_write(&sb->s_umount);
+ return ret;
}
/*
@@ -2243,6 +2311,7 @@ static int do_remount(struct path *path, int ms_flags, int sb_flags,
int err;
struct super_block *sb = path->mnt->mnt_sb;
struct mount *mnt = real_mount(path->mnt);
+ void *sec_opts = NULL;
if (!check_mnt(mnt))
return -EINVAL;
@@ -2250,50 +2319,25 @@ static int do_remount(struct path *path, int ms_flags, int sb_flags,
if (path->dentry != path->mnt->mnt_root)
return -EINVAL;
- /* Don't allow changing of locked mnt flags.
- *
- * No locks need to be held here while testing the various
- * MNT_LOCK flags because those flags can never be cleared
- * once they are set.
- */
- if ((mnt->mnt.mnt_flags & MNT_LOCK_READONLY) &&
- !(mnt_flags & MNT_READONLY)) {
- return -EPERM;
- }
- if ((mnt->mnt.mnt_flags & MNT_LOCK_NODEV) &&
- !(mnt_flags & MNT_NODEV)) {
- return -EPERM;
- }
- if ((mnt->mnt.mnt_flags & MNT_LOCK_NOSUID) &&
- !(mnt_flags & MNT_NOSUID)) {
- return -EPERM;
- }
- if ((mnt->mnt.mnt_flags & MNT_LOCK_NOEXEC) &&
- !(mnt_flags & MNT_NOEXEC)) {
- return -EPERM;
- }
- if ((mnt->mnt.mnt_flags & MNT_LOCK_ATIME) &&
- ((mnt->mnt.mnt_flags & MNT_ATIME_MASK) != (mnt_flags & MNT_ATIME_MASK))) {
+ if (!can_change_locked_flags(mnt, mnt_flags))
return -EPERM;
- }
- err = security_sb_remount(sb, data);
+ if (data && !(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)) {
+ err = security_sb_eat_lsm_opts(data, &sec_opts);
+ if (err)
+ return err;
+ }
+ err = security_sb_remount(sb, sec_opts);
+ security_free_mnt_opts(&sec_opts);
if (err)
return err;
down_write(&sb->s_umount);
- if (ms_flags & MS_BIND)
- err = change_mount_flags(path->mnt, ms_flags);
- else if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
- err = -EPERM;
- else
+ err = -EPERM;
+ if (ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) {
err = do_remount_sb(sb, sb_flags, data, 0);
- if (!err) {
- lock_mount_hash();
- mnt_flags |= mnt->mnt.mnt_flags & ~MNT_USER_SETTABLE_MASK;
- mnt->mnt.mnt_flags = mnt_flags;
- touch_mnt_namespace(mnt->mnt_ns);
- unlock_mount_hash();
+ if (!err)
+ set_mount_attributes(mnt, mnt_flags);
}
up_write(&sb->s_umount);
return err;
@@ -2788,7 +2832,9 @@ long do_mount(const char *dev_name, const char __user *dir_name,
SB_LAZYTIME |
SB_I_VERSION);
- if (flags & MS_REMOUNT)
+ if ((flags & (MS_REMOUNT | MS_BIND)) == (MS_REMOUNT | MS_BIND))
+ retval = do_reconfigure_mnt(&path, mnt_flags);
+ else if (flags & MS_REMOUNT)
retval = do_remount(&path, flags, sb_flags, mnt_flags,
data_page);
else if (flags & MS_BIND)
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 7f80f036ebd9..b1e577302518 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -123,7 +123,7 @@ struct nfs_parsed_mount_data {
unsigned short protocol;
} nfs_server;
- struct security_mnt_opts lsm_opts;
+ void *lsm_opts;
struct net *net;
};
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 7c942462d8c6..22ce3c8a2f46 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -929,7 +929,7 @@ static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
data->minorversion = 0;
data->need_mount = true;
data->net = current->nsproxy->net_ns;
- security_init_mnt_opts(&data->lsm_opts);
+ data->lsm_opts = NULL;
}
return data;
}
@@ -1206,7 +1206,7 @@ static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
static int nfs_parse_mount_options(char *raw,
struct nfs_parsed_mount_data *mnt)
{
- char *p, *string, *secdata;
+ char *p, *string;
int rc, sloppy = 0, invalid_option = 0;
unsigned short protofamily = AF_UNSPEC;
unsigned short mountfamily = AF_UNSPEC;
@@ -1217,20 +1217,10 @@ static int nfs_parse_mount_options(char *raw,
}
dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
- secdata = alloc_secdata();
- if (!secdata)
- goto out_nomem;
-
- rc = security_sb_copy_data(raw, secdata);
+ rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
if (rc)
goto out_security_failure;
- rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
- if (rc)
- goto out_security_failure;
-
- free_secdata(secdata);
-
while ((p = strsep(&raw, ",")) != NULL) {
substring_t args[MAX_OPT_ARGS];
unsigned long option;
@@ -1682,7 +1672,6 @@ out_nomem:
printk(KERN_INFO "NFS: not enough memory to parse option\n");
return 0;
out_security_failure:
- free_secdata(secdata);
printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
return 0;
}
@@ -2081,14 +2070,9 @@ static int nfs23_validate_mount_data(void *options,
if (data->context[0]){
#ifdef CONFIG_SECURITY_SELINUX
int rc;
- char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
- if (!opts_str)
- return -ENOMEM;
- strcpy(opts_str, "context=");
data->context[NFS_MAX_CONTEXT_LEN] = '\0';
- strcat(opts_str, &data->context[0]);
- rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
- kfree(opts_str);
+ rc = security_add_mnt_opt("context", data->context,
+ strlen(data->context), &args->lsm_opts);
if (rc)
return rc;
#else
@@ -2271,7 +2255,7 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
options->version <= 6))))
return 0;
- data = kzalloc(sizeof(*data), GFP_KERNEL);
+ data = nfs_alloc_parsed_mount_data();
if (data == NULL)
return -ENOMEM;
@@ -2310,8 +2294,10 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
/* compare new mount options with old ones */
error = nfs_compare_remount_data(nfss, data);
+ if (!error)
+ error = security_sb_remount(sb, data->lsm_opts);
out:
- kfree(data);
+ nfs_free_parsed_mount_data(data);
return error;
}
EXPORT_SYMBOL_GPL(nfs_remount);
@@ -2548,7 +2534,7 @@ int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
kflags |= SECURITY_LSM_NATIVE_LABELS;
- error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
+ error = security_sb_set_mnt_opts(s, mount_info->parsed->lsm_opts,
kflags, &kflags_out);
if (error)
goto err;
diff --git a/fs/pnode.c b/fs/pnode.c
index 53d411a371ce..1100e810d855 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -10,6 +10,7 @@
#include <linux/mount.h>
#include <linux/fs.h>
#include <linux/nsproxy.h>
+#include <uapi/linux/mount.h>
#include "internal.h"
#include "pnode.h"
diff --git a/fs/super.c b/fs/super.c
index ca53a08497ed..48e25eba8465 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -35,6 +35,7 @@
#include <linux/fsnotify.h>
#include <linux/lockdep.h>
#include <linux/user_namespace.h>
+#include <uapi/linux/mount.h>
#include "internal.h"
static int thaw_super_locked(struct super_block *sb);
@@ -1245,17 +1246,13 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
{
struct dentry *root;
struct super_block *sb;
- char *secdata = NULL;
int error = -ENOMEM;
+ void *sec_opts = NULL;
if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) {
- secdata = alloc_secdata();
- if (!secdata)
- goto out;
-
- error = security_sb_copy_data(data, secdata);
+ error = security_sb_eat_lsm_opts(data, &sec_opts);
if (error)
- goto out_free_secdata;
+ return ERR_PTR(error);
}
root = type->mount(type, flags, name, data);
@@ -1276,10 +1273,16 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
smp_wmb();
sb->s_flags |= SB_BORN;
- error = security_sb_kern_mount(sb, flags, secdata);
+ error = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL);
if (error)
goto out_sb;
+ if (!(flags & (MS_KERNMOUNT|MS_SUBMOUNT))) {
+ error = security_sb_kern_mount(sb);
+ if (error)
+ goto out_sb;
+ }
+
/*
* filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE
* but s_maxbytes was an unsigned long long for many releases. Throw
@@ -1290,14 +1293,13 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
"negative value (%lld)\n", type->name, sb->s_maxbytes);
up_write(&sb->s_umount);
- free_secdata(secdata);
+ security_free_mnt_opts(&sec_opts);
return root;
out_sb:
dput(root);
deactivate_locked_super(sb);
out_free_secdata:
- free_secdata(secdata);
-out:
+ security_free_mnt_opts(&sec_opts);
return ERR_PTR(error);
}
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index aaeb7fa24dc4..9a0bdf91e646 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1461,9 +1461,10 @@ union security_list_options {
int (*sb_alloc_security)(struct super_block *sb);
void (*sb_free_security)(struct super_block *sb);
- int (*sb_copy_data)(char *orig, char *copy);
- int (*sb_remount)(struct super_block *sb, void *data);
- int (*sb_kern_mount)(struct super_block *sb, int flags, void *data);
+ void (*sb_free_mnt_opts)(void *mnt_opts);
+ int (*sb_eat_lsm_opts)(char *orig, void **mnt_opts);
+ int (*sb_remount)(struct super_block *sb, void *mnt_opts);
+ int (*sb_kern_mount)(struct super_block *sb);
int (*sb_show_options)(struct seq_file *m, struct super_block *sb);
int (*sb_statfs)(struct dentry *dentry);
int (*sb_mount)(const char *dev_name, const struct path *path,
@@ -1471,14 +1472,15 @@ union security_list_options {
int (*sb_umount)(struct vfsmount *mnt, int flags);
int (*sb_pivotroot)(const struct path *old_path, const struct path *new_path);
int (*sb_set_mnt_opts)(struct super_block *sb,
- struct security_mnt_opts *opts,
+ void *mnt_opts,
unsigned long kern_flags,
unsigned long *set_kern_flags);
int (*sb_clone_mnt_opts)(const struct super_block *oldsb,
struct super_block *newsb,
unsigned long kern_flags,
unsigned long *set_kern_flags);
- int (*sb_parse_opts_str)(char *options, struct security_mnt_opts *opts);
+ int (*sb_add_mnt_opt)(const char *option, const char *val, int len,
+ void **mnt_opts);
int (*dentry_init_security)(struct dentry *dentry, int mode,
const struct qstr *name, void **ctx,
u32 *ctxlen);
@@ -1800,7 +1802,8 @@ struct security_hook_heads {
struct hlist_head bprm_committed_creds;
struct hlist_head sb_alloc_security;
struct hlist_head sb_free_security;
- struct hlist_head sb_copy_data;
+ struct hlist_head sb_free_mnt_opts;
+ struct hlist_head sb_eat_lsm_opts;
struct hlist_head sb_remount;
struct hlist_head sb_kern_mount;
struct hlist_head sb_show_options;
@@ -1810,7 +1813,7 @@ struct security_hook_heads {
struct hlist_head sb_pivotroot;
struct hlist_head sb_set_mnt_opts;
struct hlist_head sb_clone_mnt_opts;
- struct hlist_head sb_parse_opts_str;
+ struct hlist_head sb_add_mnt_opt;
struct hlist_head dentry_init_security;
struct hlist_head dentry_create_files_as;
#ifdef CONFIG_SECURITY_PATH
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 45b1f56c6c2f..037eed52164b 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -81,7 +81,7 @@ extern void mnt_drop_write_file(struct file *file);
extern void mntput(struct vfsmount *mnt);
extern struct vfsmount *mntget(struct vfsmount *mnt);
extern struct vfsmount *mnt_clone_internal(const struct path *path);
-extern int __mnt_is_readonly(struct vfsmount *mnt);
+extern bool __mnt_is_readonly(struct vfsmount *mnt);
extern bool mnt_may_suid(struct vfsmount *mnt);
struct path;
diff --git a/include/linux/security.h b/include/linux/security.h
index d170a5b031f3..dbfb5a66babb 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -182,36 +182,10 @@ static inline const char *kernel_load_data_id_str(enum kernel_load_data_id id)
#ifdef CONFIG_SECURITY
-struct security_mnt_opts {
- char **mnt_opts;
- int *mnt_opts_flags;
- int num_mnt_opts;
-};
-
int call_lsm_notifier(enum lsm_event event, void *data);
int register_lsm_notifier(struct notifier_block *nb);
int unregister_lsm_notifier(struct notifier_block *nb);
-static inline void security_init_mnt_opts(struct security_mnt_opts *opts)
-{
- opts->mnt_opts = NULL;
- opts->mnt_opts_flags = NULL;
- opts->num_mnt_opts = 0;
-}
-
-static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
-{
- int i;
- if (opts->mnt_opts)
- for (i = 0; i < opts->num_mnt_opts; i++)
- kfree(opts->mnt_opts[i]);
- kfree(opts->mnt_opts);
- opts->mnt_opts = NULL;
- kfree(opts->mnt_opts_flags);
- opts->mnt_opts_flags = NULL;
- opts->num_mnt_opts = 0;
-}
-
/* prototypes */
extern int security_init(void);
@@ -248,9 +222,10 @@ void security_bprm_committing_creds(struct linux_binprm *bprm);
void security_bprm_committed_creds(struct linux_binprm *bprm);
int security_sb_alloc(struct super_block *sb);
void security_sb_free(struct super_block *sb);
-int security_sb_copy_data(char *orig, char *copy);
-int security_sb_remount(struct super_block *sb, void *data);
-int security_sb_kern_mount(struct super_block *sb, int flags, void *data);
+void security_free_mnt_opts(void **mnt_opts);
+int security_sb_eat_lsm_opts(char *options, void **mnt_opts);
+int security_sb_remount(struct super_block *sb, void *mnt_opts);
+int security_sb_kern_mount(struct super_block *sb);
int security_sb_show_options(struct seq_file *m, struct super_block *sb);
int security_sb_statfs(struct dentry *dentry);
int security_sb_mount(const char *dev_name, const struct path *path,
@@ -258,14 +233,15 @@ int security_sb_mount(const char *dev_name, const struct path *path,
int security_sb_umount(struct vfsmount *mnt, int flags);
int security_sb_pivotroot(const struct path *old_path, const struct path *new_path);
int security_sb_set_mnt_opts(struct super_block *sb,
- struct security_mnt_opts *opts,
+ void *mnt_opts,
unsigned long kern_flags,
unsigned long *set_kern_flags);
int security_sb_clone_mnt_opts(const struct super_block *oldsb,
struct super_block *newsb,
unsigned long kern_flags,
unsigned long *set_kern_flags);
-int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts);
+int security_add_mnt_opt(const char *option, const char *val,
+ int len, void **mnt_opts);
int security_dentry_init_security(struct dentry *dentry, int mode,
const struct qstr *name, void **ctx,
u32 *ctxlen);
@@ -403,8 +379,6 @@ int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen);
int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen);
int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen);
#else /* CONFIG_SECURITY */
-struct security_mnt_opts {
-};
static inline int call_lsm_notifier(enum lsm_event event, void *data)
{
@@ -421,11 +395,7 @@ static inline int unregister_lsm_notifier(struct notifier_block *nb)
return 0;
}
-static inline void security_init_mnt_opts(struct security_mnt_opts *opts)
-{
-}
-
-static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
+static inline void security_free_mnt_opts(void **mnt_opts)
{
}
@@ -555,17 +525,19 @@ static inline int security_sb_alloc(struct super_block *sb)
static inline void security_sb_free(struct super_block *sb)
{ }
-static inline int security_sb_copy_data(char *orig, char *copy)
+static inline int security_sb_eat_lsm_opts(char *options,
+ void **mnt_opts)
{
return 0;
}
-static inline int security_sb_remount(struct super_block *sb, void *data)
+static inline int security_sb_remount(struct super_block *sb,
+ void *mnt_opts)
{
return 0;
}
-static inline int security_sb_kern_mount(struct super_block *sb, int flags, void *data)
+static inline int security_sb_kern_mount(struct super_block *sb)
{
return 0;
}
@@ -600,7 +572,7 @@ static inline int security_sb_pivotroot(const struct path *old_path,
}
static inline int security_sb_set_mnt_opts(struct super_block *sb,
- struct security_mnt_opts *opts,
+ void *mnt_opts,
unsigned long kern_flags,
unsigned long *set_kern_flags)
{
@@ -615,7 +587,8 @@ static inline int security_sb_clone_mnt_opts(const struct super_block *oldsb,
return 0;
}
-static inline int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
+static inline int security_add_mnt_opt(const char *option, const char *val,
+ int len, void **mnt_opts)
{
return 0;
}
@@ -1820,28 +1793,5 @@ static inline void security_bpf_prog_free(struct bpf_prog_aux *aux)
#endif /* CONFIG_SECURITY */
#endif /* CONFIG_BPF_SYSCALL */
-#ifdef CONFIG_SECURITY
-
-static inline char *alloc_secdata(void)
-{
- return (char *)get_zeroed_page(GFP_KERNEL);
-}
-
-static inline void free_secdata(void *secdata)
-{
- free_page((unsigned long)secdata);
-}
-
-#else
-
-static inline char *alloc_secdata(void)
-{
- return (char *)1;
-}
-
-static inline void free_secdata(void *secdata)
-{ }
-#endif /* CONFIG_SECURITY */
-
#endif /* ! __LINUX_SECURITY_H */
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index a441ea1bfe6d..53a22e8e0408 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -14,6 +14,11 @@
#include <linux/ioctl.h>
#include <linux/types.h>
+/* Use of MS_* flags within the kernel is restricted to core mount(2) code. */
+#if !defined(__KERNEL__)
+#include <linux/mount.h>
+#endif
+
/*
* It's silly to have NR_OPEN bigger than NR_FILE, but you can change
* the file limit at runtime and only root can increase the per-process
@@ -101,57 +106,6 @@ struct inodes_stat_t {
#define NR_FILE 8192 /* this can well be larger on a larger system */
-
-/*
- * These are the fs-independent mount-flags: up to 32 flags are supported
- */
-#define MS_RDONLY 1 /* Mount read-only */
-#define MS_NOSUID 2 /* Ignore suid and sgid bits */
-#define MS_NODEV 4 /* Disallow access to device special files */
-#define MS_NOEXEC 8 /* Disallow program execution */
-#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
-#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
-#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
-#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
-#define MS_NOATIME 1024 /* Do not update access times. */
-#define MS_NODIRATIME 2048 /* Do not update directory access times */
-#define MS_BIND 4096
-#define MS_MOVE 8192
-#define MS_REC 16384
-#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
- MS_VERBOSE is deprecated. */
-#define MS_SILENT 32768
-#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
-#define MS_UNBINDABLE (1<<17) /* change to unbindable */
-#define MS_PRIVATE (1<<18) /* change to private */
-#define MS_SLAVE (1<<19) /* change to slave */
-#define MS_SHARED (1<<20) /* change to shared */
-#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
-#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
-#define MS_I_VERSION (1<<23) /* Update inode I_version field */
-#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
-#define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
-
-/* These sb flags are internal to the kernel */
-#define MS_SUBMOUNT (1<<26)
-#define MS_NOREMOTELOCK (1<<27)
-#define MS_NOSEC (1<<28)
-#define MS_BORN (1<<29)
-#define MS_ACTIVE (1<<30)
-#define MS_NOUSER (1<<31)
-
-/*
- * Superblock flags that can be altered by MS_REMOUNT
- */
-#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
- MS_LAZYTIME)
-
-/*
- * Old magic mount flag and mask
- */
-#define MS_MGC_VAL 0xC0ED0000
-#define MS_MGC_MSK 0xffff0000
-
/*
* Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR.
*/
diff --git a/include/uapi/linux/mount.h b/include/uapi/linux/mount.h
new file mode 100644
index 000000000000..3f9ec42510b0
--- /dev/null
+++ b/include/uapi/linux/mount.h
@@ -0,0 +1,58 @@
+#ifndef _UAPI_LINUX_MOUNT_H
+#define _UAPI_LINUX_MOUNT_H
+
+/*
+ * These are the fs-independent mount-flags: up to 32 flags are supported
+ *
+ * Usage of these is restricted within the kernel to core mount(2) code and
+ * callers of sys_mount() only. Filesystems should be using the SB_*
+ * equivalent instead.
+ */
+#define MS_RDONLY 1 /* Mount read-only */
+#define MS_NOSUID 2 /* Ignore suid and sgid bits */
+#define MS_NODEV 4 /* Disallow access to device special files */
+#define MS_NOEXEC 8 /* Disallow program execution */
+#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
+#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
+#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
+#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
+#define MS_NOATIME 1024 /* Do not update access times. */
+#define MS_NODIRATIME 2048 /* Do not update directory access times */
+#define MS_BIND 4096
+#define MS_MOVE 8192
+#define MS_REC 16384
+#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
+ MS_VERBOSE is deprecated. */
+#define MS_SILENT 32768
+#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
+#define MS_UNBINDABLE (1<<17) /* change to unbindable */
+#define MS_PRIVATE (1<<18) /* change to private */
+#define MS_SLAVE (1<<19) /* change to slave */
+#define MS_SHARED (1<<20) /* change to shared */
+#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
+#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
+#define MS_I_VERSION (1<<23) /* Update inode I_version field */
+#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
+#define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
+
+/* These sb flags are internal to the kernel */
+#define MS_SUBMOUNT (1<<26)
+#define MS_NOREMOTELOCK (1<<27)
+#define MS_NOSEC (1<<28)
+#define MS_BORN (1<<29)
+#define MS_ACTIVE (1<<30)
+#define MS_NOUSER (1<<31)
+
+/*
+ * Superblock flags that can be altered by MS_REMOUNT
+ */
+#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
+ MS_LAZYTIME)
+
+/*
+ * Old magic mount flag and mask
+ */
+#define MS_MGC_VAL 0xC0ED0000
+#define MS_MGC_MSK 0xffff0000
+
+#endif /* _UAPI_LINUX_MOUNT_H */
diff --git a/init/do_mounts.c b/init/do_mounts.c
index a754e3ba9831..f8c230c77035 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -22,6 +22,7 @@
#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
#include <linux/nfs_mount.h>
+#include <uapi/linux/mount.h>
#include "do_mounts.h"
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index ccfc06607ef2..a9c6cc56f505 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -8,6 +8,7 @@
#include <linux/sched.h>
#include <linux/freezer.h>
#include <linux/kmod.h>
+#include <uapi/linux/mount.h>
#include "do_mounts.h"
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 42446a216f3b..2c010874329f 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -26,6 +26,7 @@
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <net/sock.h>
+#include <uapi/linux/mount.h>
#include "include/apparmor.h"
#include "include/apparmorfs.h"
diff --git a/security/apparmor/mount.c b/security/apparmor/mount.c
index c1da22482bfb..8c3787399356 100644
--- a/security/apparmor/mount.c
+++ b/security/apparmor/mount.c
@@ -15,6 +15,7 @@
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/namei.h>
+#include <uapi/linux/mount.h>
#include "include/apparmor.h"
#include "include/audit.h"
diff --git a/security/security.c b/security/security.c
index d670136dda2c..f1b8d2587639 100644
--- a/security/security.c
+++ b/security/security.c
@@ -384,20 +384,31 @@ void security_sb_free(struct super_block *sb)
call_void_hook(sb_free_security, sb);
}
-int security_sb_copy_data(char *orig, char *copy)
+void security_free_mnt_opts(void **mnt_opts)
{
- return call_int_hook(sb_copy_data, 0, orig, copy);
+ if (!*mnt_opts)
+ return;
+ call_void_hook(sb_free_mnt_opts, *mnt_opts);
+ *mnt_opts = NULL;
+}
+EXPORT_SYMBOL(security_free_mnt_opts);
+
+int security_sb_eat_lsm_opts(char *options, void **mnt_opts)
+{
+ return call_int_hook(sb_eat_lsm_opts, 0, options, mnt_opts);
}
-EXPORT_SYMBOL(security_sb_copy_data);
+EXPORT_SYMBOL(security_sb_eat_lsm_opts);
-int security_sb_remount(struct super_block *sb, void *data)
+int security_sb_remount(struct super_block *sb,
+ void *mnt_opts)
{
- return call_int_hook(sb_remount, 0, sb, data);
+ return call_int_hook(sb_remount, 0, sb, mnt_opts);
}
+EXPORT_SYMBOL(security_sb_remount);
-int security_sb_kern_mount(struct super_block *sb, int flags, void *data)
+int security_sb_kern_mount(struct super_block *sb)
{
- return call_int_hook(sb_kern_mount, 0, sb, flags, data);
+ return call_int_hook(sb_kern_mount, 0, sb);
}
int security_sb_show_options(struct seq_file *m, struct super_block *sb)
@@ -427,13 +438,13 @@ int security_sb_pivotroot(const struct path *old_path, const struct path *new_pa
}
int security_sb_set_mnt_opts(struct super_block *sb,
- struct security_mnt_opts *opts,
+ void *mnt_opts,
unsigned long kern_flags,
unsigned long *set_kern_flags)
{
return call_int_hook(sb_set_mnt_opts,
- opts->num_mnt_opts ? -EOPNOTSUPP : 0, sb,
- opts, kern_flags, set_kern_flags);
+ mnt_opts ? -EOPNOTSUPP : 0, sb,
+ mnt_opts, kern_flags, set_kern_flags);
}
EXPORT_SYMBOL(security_sb_set_mnt_opts);
@@ -447,11 +458,13 @@ int security_sb_clone_mnt_opts(const struct super_block *oldsb,
}
EXPORT_SYMBOL(security_sb_clone_mnt_opts);
-int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
+int security_add_mnt_opt(const char *option, const char *val, int len,
+ void **mnt_opts)
{
- return call_int_hook(sb_parse_opts_str, 0, options, opts);
+ return call_int_hook(sb_add_mnt_opt, -EINVAL,
+ option, val, len, mnt_opts);
}
-EXPORT_SYMBOL(security_sb_parse_opts_str);
+EXPORT_SYMBOL(security_add_mnt_opt);
int security_inode_alloc(struct inode *inode)
{
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 0f27db6d94a9..f0e36c3492ba 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -88,6 +88,7 @@
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/bpf.h>
+#include <uapi/linux/mount.h>
#include "avc.h"
#include "objsec.h"
@@ -432,6 +433,20 @@ static void superblock_free_security(struct super_block *sb)
kfree(sbsec);
}
+struct selinux_mnt_opts {
+ const char *fscontext, *context, *rootcontext, *defcontext;
+};
+
+static void selinux_free_mnt_opts(void *mnt_opts)
+{
+ struct selinux_mnt_opts *opts = mnt_opts;
+ kfree(opts->fscontext);
+ kfree(opts->context);
+ kfree(opts->rootcontext);
+ kfree(opts->defcontext);
+ kfree(opts);
+}
+
static inline int inode_doinit(struct inode *inode)
{
return inode_doinit_with_dentry(inode, NULL);
@@ -443,20 +458,42 @@ enum {
Opt_fscontext = 2,
Opt_defcontext = 3,
Opt_rootcontext = 4,
- Opt_labelsupport = 5,
- Opt_nextmntopt = 6,
+ Opt_seclabel = 5,
};
-#define NUM_SEL_MNT_OPTS (Opt_nextmntopt - 1)
-
-static const match_table_t tokens = {
- {Opt_context, CONTEXT_STR "%s"},
- {Opt_fscontext, FSCONTEXT_STR "%s"},
- {Opt_defcontext, DEFCONTEXT_STR "%s"},
- {Opt_rootcontext, ROOTCONTEXT_STR "%s"},
- {Opt_labelsupport, LABELSUPP_STR},
- {Opt_error, NULL},
+#define A(s, has_arg) {#s, sizeof(#s) - 1, Opt_##s, has_arg}
+static struct {
+ const char *name;
+ int len;
+ int opt;
+ bool has_arg;
+} tokens[] = {
+ A(context, true),
+ A(fscontext, true),
+ A(defcontext, true),
+ A(rootcontext, true),
+ A(seclabel, false),
};
+#undef A
+
+static int match_opt_prefix(char *s, int l, char **arg)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(tokens); i++) {
+ size_t len = tokens[i].len;
+ if (len > l || memcmp(s, tokens[i].name, len))
+ continue;
+ if (tokens[i].has_arg) {
+ if (len == l || s[len] != '=')
+ continue;
+ *arg = s + len + 1;
+ } else if (len != l)
+ continue;
+ return tokens[i].opt;
+ }
+ return Opt_error;
+}
#define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
@@ -570,10 +607,9 @@ static int sb_finish_set_opts(struct super_block *sb)
during get_sb by a pseudo filesystem that directly
populates itself. */
spin_lock(&sbsec->isec_lock);
-next_inode:
- if (!list_empty(&sbsec->isec_head)) {
+ while (!list_empty(&sbsec->isec_head)) {
struct inode_security_struct *isec =
- list_entry(sbsec->isec_head.next,
+ list_first_entry(&sbsec->isec_head,
struct inode_security_struct, list);
struct inode *inode = isec->inode;
list_del_init(&isec->list);
@@ -585,112 +621,12 @@ next_inode:
iput(inode);
}
spin_lock(&sbsec->isec_lock);
- goto next_inode;
}
spin_unlock(&sbsec->isec_lock);
out:
return rc;
}
-/*
- * This function should allow an FS to ask what it's mount security
- * options were so it can use those later for submounts, displaying
- * mount options, or whatever.
- */
-static int selinux_get_mnt_opts(const struct super_block *sb,
- struct security_mnt_opts *opts)
-{
- int rc = 0, i;
- struct superblock_security_struct *sbsec = sb->s_security;
- char *context = NULL;
- u32 len;
- char tmp;
-
- security_init_mnt_opts(opts);
-
- if (!(sbsec->flags & SE_SBINITIALIZED))
- return -EINVAL;
-
- if (!selinux_state.initialized)
- return -EINVAL;
-
- /* make sure we always check enough bits to cover the mask */
- BUILD_BUG_ON(SE_MNTMASK >= (1 << NUM_SEL_MNT_OPTS));
-
- tmp = sbsec->flags & SE_MNTMASK;
- /* count the number of mount options for this sb */
- for (i = 0; i < NUM_SEL_MNT_OPTS; i++) {
- if (tmp & 0x01)
- opts->num_mnt_opts++;
- tmp >>= 1;
- }
- /* Check if the Label support flag is set */
- if (sbsec->flags & SBLABEL_MNT)
- opts->num_mnt_opts++;
-
- opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC);
- if (!opts->mnt_opts) {
- rc = -ENOMEM;
- goto out_free;
- }
-
- opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC);
- if (!opts->mnt_opts_flags) {
- rc = -ENOMEM;
- goto out_free;
- }
-
- i = 0;
- if (sbsec->flags & FSCONTEXT_MNT) {
- rc = security_sid_to_context(&selinux_state, sbsec->sid,
- &context, &len);
- if (rc)
- goto out_free;
- opts->mnt_opts[i] = context;
- opts->mnt_opts_flags[i++] = FSCONTEXT_MNT;
- }
- if (sbsec->flags & CONTEXT_MNT) {
- rc = security_sid_to_context(&selinux_state,
- sbsec->mntpoint_sid,
- &context, &len);
- if (rc)
- goto out_free;
- opts->mnt_opts[i] = context;
- opts->mnt_opts_flags[i++] = CONTEXT_MNT;
- }
- if (sbsec->flags & DEFCONTEXT_MNT) {
- rc = security_sid_to_context(&selinux_state, sbsec->def_sid,
- &context, &len);
- if (rc)
- goto out_free;
- opts->mnt_opts[i] = context;
- opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT;
- }
- if (sbsec->flags & ROOTCONTEXT_MNT) {
- struct dentry *root = sbsec->sb->s_root;
- struct inode_security_struct *isec = backing_inode_security(root);
-
- rc = security_sid_to_context(&selinux_state, isec->sid,
- &context, &len);
- if (rc)
- goto out_free;
- opts->mnt_opts[i] = context;
- opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT;
- }
- if (sbsec->flags & SBLABEL_MNT) {
- opts->mnt_opts[i] = NULL;
- opts->mnt_opts_flags[i++] = SBLABEL_MNT;
- }
-
- BUG_ON(i != opts->num_mnt_opts);
-
- return 0;
-
-out_free:
- security_free_mnt_opts(opts);
- return rc;
-}
-
static int bad_option(struct superblock_security_struct *sbsec, char flag,
u32 old_sid, u32 new_sid)
{
@@ -711,31 +647,39 @@ static int bad_option(struct superblock_security_struct *sbsec, char flag,
return 0;
}
+static int parse_sid(struct super_block *sb, const char *s, u32 *sid)
+{
+ int rc = security_context_str_to_sid(&selinux_state, s,
+ sid, GFP_KERNEL);
+ if (rc)
+ pr_warn("SELinux: security_context_str_to_sid"
+ "(%s) failed for (dev %s, type %s) errno=%d\n",
+ s, sb->s_id, sb->s_type->name, rc);
+ return rc;
+}
+
/*
* Allow filesystems with binary mount data to explicitly set mount point
* labeling information.
*/
static int selinux_set_mnt_opts(struct super_block *sb,
- struct security_mnt_opts *opts,
+ void *mnt_opts,
unsigned long kern_flags,
unsigned long *set_kern_flags)
{
const struct cred *cred = current_cred();
- int rc = 0, i;
struct superblock_security_struct *sbsec = sb->s_security;
- const char *name = sb->s_type->name;
struct dentry *root = sbsec->sb->s_root;
+ struct selinux_mnt_opts *opts = mnt_opts;
struct inode_security_struct *root_isec;
u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
u32 defcontext_sid = 0;
- char **mount_options = opts->mnt_opts;
- int *flags = opts->mnt_opts_flags;
- int num_opts = opts->num_mnt_opts;
+ int rc = 0;
mutex_lock(&sbsec->lock);
if (!selinux_state.initialized) {
- if (!num_opts) {
+ if (!opts) {
/* Defer initialization until selinux_complete_init,
after the initial policy is loaded and the security
server is ready to handle calls. */
@@ -765,7 +709,7 @@ static int selinux_set_mnt_opts(struct super_block *sb,
* will be used for both mounts)
*/
if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
- && (num_opts == 0))
+ && !opts)
goto out;
root_isec = backing_inode_security_novalidate(root);
@@ -775,68 +719,48 @@ static int selinux_set_mnt_opts(struct super_block *sb,
* also check if someone is trying to mount the same sb more
* than once with different security options.
*/
- for (i = 0; i < num_opts; i++) {
- u32 sid;
-
- if (flags[i] == SBLABEL_MNT)
- continue;
- rc = security_context_str_to_sid(&selinux_state,
- mount_options[i], &sid,
- GFP_KERNEL);
- if (rc) {
- pr_warn("SELinux: security_context_str_to_sid"
- "(%s) failed for (dev %s, type %s) errno=%d\n",
- mount_options[i], sb->s_id, name, rc);
- goto out;
- }
- switch (flags[i]) {
- case FSCONTEXT_MNT:
- fscontext_sid = sid;
-
+ if (opts) {
+ if (opts->fscontext) {
+ rc = parse_sid(sb, opts->fscontext, &fscontext_sid);
+ if (rc)
+ goto out;
if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
fscontext_sid))
goto out_double_mount;
-
sbsec->flags |= FSCONTEXT_MNT;
- break;
- case CONTEXT_MNT:
- context_sid = sid;
-
+ }
+ if (opts->context) {
+ rc = parse_sid(sb, opts->context, &context_sid);
+ if (rc)
+ goto out;
if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
context_sid))
goto out_double_mount;
-
sbsec->flags |= CONTEXT_MNT;
- break;
- case ROOTCONTEXT_MNT:
- rootcontext_sid = sid;
-
+ }
+ if (opts->rootcontext) {
+ rc = parse_sid(sb, opts->rootcontext, &rootcontext_sid);
+ if (rc)
+ goto out;
if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
rootcontext_sid))
goto out_double_mount;
-
sbsec->flags |= ROOTCONTEXT_MNT;
-
- break;
- case DEFCONTEXT_MNT:
- defcontext_sid = sid;
-
+ }
+ if (opts->defcontext) {
+ rc = parse_sid(sb, opts->defcontext, &defcontext_sid);
+ if (rc)
+ goto out;
if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
defcontext_sid))
goto out_double_mount;
-
sbsec->flags |= DEFCONTEXT_MNT;
-
- break;
- default:
- rc = -EINVAL;
- goto out;
}
}
if (sbsec->flags & SE_SBINITIALIZED) {
/* previously mounted with options, but not on this attempt? */
- if ((sbsec->flags & SE_MNTMASK) && !num_opts)
+ if ((sbsec->flags & SE_MNTMASK) && !opts)
goto out_double_mount;
rc = 0;
goto out;
@@ -969,7 +893,8 @@ out:
out_double_mount:
rc = -EINVAL;
pr_warn("SELinux: mount invalid. Same superblock, different "
- "security settings for (dev %s, type %s)\n", sb->s_id, name);
+ "security settings for (dev %s, type %s)\n", sb->s_id,
+ sb->s_type->name);
goto out;
}
@@ -1081,218 +1006,145 @@ out:
return rc;
}
-static int selinux_parse_opts_str(char *options,
- struct security_mnt_opts *opts)
+static int selinux_add_opt(int token, const char *s, void **mnt_opts)
{
- char *p;
- char *context = NULL, *defcontext = NULL;
- char *fscontext = NULL, *rootcontext = NULL;
- int rc, num_mnt_opts = 0;
-
- opts->num_mnt_opts = 0;
+ struct selinux_mnt_opts *opts = *mnt_opts;
- /* Standard string-based options. */
- while ((p = strsep(&options, "|")) != NULL) {
- int token;
- substring_t args[MAX_OPT_ARGS];
-
- if (!*p)
- continue;
-
- token = match_token(p, tokens, args);
-
- switch (token) {
- case Opt_context:
- if (context || defcontext) {
- rc = -EINVAL;
- pr_warn(SEL_MOUNT_FAIL_MSG);
- goto out_err;
- }
- context = match_strdup(&args[0]);
- if (!context) {
- rc = -ENOMEM;
- goto out_err;
- }
- break;
-
- case Opt_fscontext:
- if (fscontext) {
- rc = -EINVAL;
- pr_warn(SEL_MOUNT_FAIL_MSG);
- goto out_err;
- }
- fscontext = match_strdup(&args[0]);
- if (!fscontext) {
- rc = -ENOMEM;
- goto out_err;
- }
- break;
-
- case Opt_rootcontext:
- if (rootcontext) {
- rc = -EINVAL;
- pr_warn(SEL_MOUNT_FAIL_MSG);
- goto out_err;
- }
- rootcontext = match_strdup(&args[0]);
- if (!rootcontext) {
- rc = -ENOMEM;
- goto out_err;
- }
- break;
-
- case Opt_defcontext:
- if (context || defcontext) {
- rc = -EINVAL;
- pr_warn(SEL_MOUNT_FAIL_MSG);
- goto out_err;
- }
- defcontext = match_strdup(&args[0]);
- if (!defcontext) {
- rc = -ENOMEM;
- goto out_err;
- }
- break;
- case Opt_labelsupport:
- break;
- default:
- rc = -EINVAL;
- pr_warn("SELinux: unknown mount option\n");
- goto out_err;
-
- }
- }
-
- rc = -ENOMEM;
- opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_KERNEL);
- if (!opts->mnt_opts)
- goto out_err;
-
- opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int),
- GFP_KERNEL);
- if (!opts->mnt_opts_flags)
- goto out_err;
+ if (token == Opt_seclabel) /* eaten and completely ignored */
+ return 0;
- if (fscontext) {
- opts->mnt_opts[num_mnt_opts] = fscontext;
- opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT;
- }
- if (context) {
- opts->mnt_opts[num_mnt_opts] = context;
- opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT;
- }
- if (rootcontext) {
- opts->mnt_opts[num_mnt_opts] = rootcontext;
- opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT;
+ if (!opts) {
+ opts = kzalloc(sizeof(struct selinux_mnt_opts), GFP_KERNEL);
+ if (!opts)
+ return -ENOMEM;
+ *mnt_opts = opts;
}
- if (defcontext) {
- opts->mnt_opts[num_mnt_opts] = defcontext;
- opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT;
+ if (!s)
+ return -ENOMEM;
+ switch (token) {
+ case Opt_context:
+ if (opts->context || opts->defcontext)
+ goto Einval;
+ opts->context = s;
+ break;
+ case Opt_fscontext:
+ if (opts->fscontext)
+ goto Einval;
+ opts->fscontext = s;
+ break;
+ case Opt_rootcontext:
+ if (opts->rootcontext)
+ goto Einval;
+ opts->rootcontext = s;
+ break;
+ case Opt_defcontext:
+ if (opts->context || opts->defcontext)
+ goto Einval;
+ opts->defcontext = s;
+ break;
}
-
- opts->num_mnt_opts = num_mnt_opts;
return 0;
-
-out_err:
- security_free_mnt_opts(opts);
- kfree(context);
- kfree(defcontext);
- kfree(fscontext);
- kfree(rootcontext);
- return rc;
+Einval:
+ pr_warn(SEL_MOUNT_FAIL_MSG);
+ return -EINVAL;
}
-/*
- * string mount options parsing and call set the sbsec
- */
-static int superblock_doinit(struct super_block *sb, void *data)
-{
- int rc = 0;
- char *options = data;
- struct security_mnt_opts opts;
-
- security_init_mnt_opts(&opts);
-
- if (!data)
- goto out;
- BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA);
+static int selinux_add_mnt_opt(const char *option, const char *val, int len,
+ void **mnt_opts)
+{
+ int token = Opt_error;
+ int rc, i;
- rc = selinux_parse_opts_str(options, &opts);
- if (rc)
- goto out_err;
+ for (i = 0; i < ARRAY_SIZE(tokens); i++) {
+ if (strcmp(option, tokens[i].name) == 0) {
+ token = tokens[i].opt;
+ break;
+ }
+ }
-out:
- rc = selinux_set_mnt_opts(sb, &opts, 0, NULL);
+ if (token == Opt_error)
+ return -EINVAL;
-out_err:
- security_free_mnt_opts(&opts);
+ if (token != Opt_seclabel)
+ val = kmemdup_nul(val, len, GFP_KERNEL);
+ rc = selinux_add_opt(token, val, mnt_opts);
+ if (unlikely(rc)) {
+ kfree(val);
+ if (*mnt_opts) {
+ selinux_free_mnt_opts(*mnt_opts);
+ *mnt_opts = NULL;
+ }
+ }
return rc;
}
-static void selinux_write_opts(struct seq_file *m,
- struct security_mnt_opts *opts)
+static int show_sid(struct seq_file *m, u32 sid)
{
- int i;
- char *prefix;
-
- for (i = 0; i < opts->num_mnt_opts; i++) {
- char *has_comma;
+ char *context = NULL;
+ u32 len;
+ int rc;
- if (opts->mnt_opts[i])
- has_comma = strchr(opts->mnt_opts[i], ',');
- else
- has_comma = NULL;
+ rc = security_sid_to_context(&selinux_state, sid,
+ &context, &len);
+ if (!rc) {
+ bool has_comma = context && strchr(context, ',');
- switch (opts->mnt_opts_flags[i]) {
- case CONTEXT_MNT:
- prefix = CONTEXT_STR;
- break;
- case FSCONTEXT_MNT:
- prefix = FSCONTEXT_STR;
- break;
- case ROOTCONTEXT_MNT:
- prefix = ROOTCONTEXT_STR;
- break;
- case DEFCONTEXT_MNT:
- prefix = DEFCONTEXT_STR;
- break;
- case SBLABEL_MNT:
- seq_putc(m, ',');
- seq_puts(m, LABELSUPP_STR);
- continue;
- default:
- BUG();
- return;
- };
- /* we need a comma before each option */
- seq_putc(m, ',');
- seq_puts(m, prefix);
if (has_comma)
seq_putc(m, '\"');
- seq_escape(m, opts->mnt_opts[i], "\"\n\\");
+ seq_escape(m, context, "\"\n\\");
if (has_comma)
seq_putc(m, '\"');
}
+ kfree(context);
+ return rc;
}
static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
{
- struct security_mnt_opts opts;
+ struct superblock_security_struct *sbsec = sb->s_security;
int rc;
- rc = selinux_get_mnt_opts(sb, &opts);
- if (rc) {
- /* before policy load we may get EINVAL, don't show anything */
- if (rc == -EINVAL)
- rc = 0;
- return rc;
- }
-
- selinux_write_opts(m, &opts);
+ if (!(sbsec->flags & SE_SBINITIALIZED))
+ return 0;
- security_free_mnt_opts(&opts);
+ if (!selinux_state.initialized)
+ return 0;
- return rc;
+ if (sbsec->flags & FSCONTEXT_MNT) {
+ seq_putc(m, ',');
+ seq_puts(m, FSCONTEXT_STR);
+ rc = show_sid(m, sbsec->sid);
+ if (rc)
+ return rc;
+ }
+ if (sbsec->flags & CONTEXT_MNT) {
+ seq_putc(m, ',');
+ seq_puts(m, CONTEXT_STR);
+ rc = show_sid(m, sbsec->mntpoint_sid);
+ if (rc)
+ return rc;
+ }
+ if (sbsec->flags & DEFCONTEXT_MNT) {
+ seq_putc(m, ',');
+ seq_puts(m, DEFCONTEXT_STR);
+ rc = show_sid(m, sbsec->def_sid);
+ if (rc)
+ return rc;
+ }
+ if (sbsec->flags & ROOTCONTEXT_MNT) {
+ struct dentry *root = sbsec->sb->s_root;
+ struct inode_security_struct *isec = backing_inode_security(root);
+ seq_putc(m, ',');
+ seq_puts(m, ROOTCONTEXT_STR);
+ rc = show_sid(m, isec->sid);
+ if (rc)
+ return rc;
+ }
+ if (sbsec->flags & SBLABEL_MNT) {
+ seq_putc(m, ',');
+ seq_puts(m, LABELSUPP_STR);
+ }
+ return 0;
}
static inline u16 inode_mode_to_security_class(umode_t mode)
@@ -2747,195 +2599,129 @@ static void selinux_sb_free_security(struct super_block *sb)
superblock_free_security(sb);
}
-static inline int match_prefix(char *prefix, int plen, char *option, int olen)
+static inline int opt_len(const char *s)
{
- if (plen > olen)
- return 0;
-
- return !memcmp(prefix, option, plen);
-}
-
-static inline int selinux_option(char *option, int len)
-{
- return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) ||
- match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) ||
- match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) ||
- match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) ||
- match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len));
-}
+ bool open_quote = false;
+ int len;
+ char c;
-static inline void take_option(char **to, char *from, int *first, int len)
-{
- if (!*first) {
- **to = ',';
- *to += 1;
- } else
- *first = 0;
- memcpy(*to, from, len);
- *to += len;
-}
-
-static inline void take_selinux_option(char **to, char *from, int *first,
- int len)
-{
- int current_size = 0;
-
- if (!*first) {
- **to = '|';
- *to += 1;
- } else
- *first = 0;
-
- while (current_size < len) {
- if (*from != '"') {
- **to = *from;
- *to += 1;
- }
- from += 1;
- current_size += 1;
+ for (len = 0; (c = s[len]) != '\0'; len++) {
+ if (c == '"')
+ open_quote = !open_quote;
+ if (c == ',' && !open_quote)
+ break;
}
+ return len;
}
-static int selinux_sb_copy_data(char *orig, char *copy)
+static int selinux_sb_eat_lsm_opts(char *options, void **mnt_opts)
{
- int fnosec, fsec, rc = 0;
- char *in_save, *in_curr, *in_end;
- char *sec_curr, *nosec_save, *nosec;
- int open_quote = 0;
-
- in_curr = orig;
- sec_curr = copy;
+ char *from = options;
+ char *to = options;
+ bool first = true;
- nosec = (char *)get_zeroed_page(GFP_KERNEL);
- if (!nosec) {
- rc = -ENOMEM;
- goto out;
- }
+ while (1) {
+ int len = opt_len(from);
+ int token, rc;
+ char *arg = NULL;
- nosec_save = nosec;
- fnosec = fsec = 1;
- in_save = in_end = orig;
+ token = match_opt_prefix(from, len, &arg);
- do {
- if (*in_end == '"')
- open_quote = !open_quote;
- if ((*in_end == ',' && open_quote == 0) ||
- *in_end == '\0') {
- int len = in_end - in_curr;
-
- if (selinux_option(in_curr, len))
- take_selinux_option(&sec_curr, in_curr, &fsec, len);
- else
- take_option(&nosec, in_curr, &fnosec, len);
+ if (token != Opt_error) {
+ char *p, *q;
- in_curr = in_end + 1;
+ /* strip quotes */
+ if (arg) {
+ for (p = q = arg; p < from + len; p++) {
+ char c = *p;
+ if (c != '"')
+ *q++ = c;
+ }
+ arg = kmemdup_nul(arg, q - arg, GFP_KERNEL);
+ }
+ rc = selinux_add_opt(token, arg, mnt_opts);
+ if (unlikely(rc)) {
+ kfree(arg);
+ if (*mnt_opts) {
+ selinux_free_mnt_opts(*mnt_opts);
+ *mnt_opts = NULL;
+ }
+ return rc;
+ }
+ } else {
+ if (!first) { // copy with preceding comma
+ from--;
+ len++;
+ }
+ if (to != from)
+ memmove(to, from, len);
+ to += len;
+ first = false;
}
- } while (*in_end++);
-
- strcpy(in_save, nosec_save);
- free_page((unsigned long)nosec_save);
-out:
- return rc;
+ if (!from[len])
+ break;
+ from += len + 1;
+ }
+ *to = '\0';
+ return 0;
}
-static int selinux_sb_remount(struct super_block *sb, void *data)
+static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
{
- int rc, i, *flags;
- struct security_mnt_opts opts;
- char *secdata, **mount_options;
+ struct selinux_mnt_opts *opts = mnt_opts;
struct superblock_security_struct *sbsec = sb->s_security;
+ u32 sid;
+ int rc;
if (!(sbsec->flags & SE_SBINITIALIZED))
return 0;
- if (!data)
+ if (!opts)
return 0;
- if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
- return 0;
-
- security_init_mnt_opts(&opts);
- secdata = alloc_secdata();
- if (!secdata)
- return -ENOMEM;
- rc = selinux_sb_copy_data(data, secdata);
- if (rc)
- goto out_free_secdata;
-
- rc = selinux_parse_opts_str(secdata, &opts);
- if (rc)
- goto out_free_secdata;
-
- mount_options = opts.mnt_opts;
- flags = opts.mnt_opts_flags;
-
- for (i = 0; i < opts.num_mnt_opts; i++) {
- u32 sid;
-
- if (flags[i] == SBLABEL_MNT)
- continue;
- rc = security_context_str_to_sid(&selinux_state,
- mount_options[i], &sid,
- GFP_KERNEL);
- if (rc) {
- pr_warn("SELinux: security_context_str_to_sid"
- "(%s) failed for (dev %s, type %s) errno=%d\n",
- mount_options[i], sb->s_id, sb->s_type->name, rc);
- goto out_free_opts;
- }
- rc = -EINVAL;
- switch (flags[i]) {
- case FSCONTEXT_MNT:
- if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
- goto out_bad_option;
- break;
- case CONTEXT_MNT:
- if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
- goto out_bad_option;
- break;
- case ROOTCONTEXT_MNT: {
- struct inode_security_struct *root_isec;
- root_isec = backing_inode_security(sb->s_root);
-
- if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
- goto out_bad_option;
- break;
- }
- case DEFCONTEXT_MNT:
- if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
- goto out_bad_option;
- break;
- default:
- goto out_free_opts;
- }
+ if (opts->fscontext) {
+ rc = parse_sid(sb, opts->fscontext, &sid);
+ if (rc)
+ return rc;
+ if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
+ goto out_bad_option;
}
+ if (opts->context) {
+ rc = parse_sid(sb, opts->context, &sid);
+ if (rc)
+ return rc;
+ if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
+ goto out_bad_option;
+ }
+ if (opts->rootcontext) {
+ struct inode_security_struct *root_isec;
+ root_isec = backing_inode_security(sb->s_root);
+ rc = parse_sid(sb, opts->rootcontext, &sid);
+ if (rc)
+ return rc;
+ if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
+ goto out_bad_option;
+ }
+ if (opts->defcontext) {
+ rc = parse_sid(sb, opts->defcontext, &sid);
+ if (rc)
+ return rc;
+ if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
+ goto out_bad_option;
+ }
+ return 0;
- rc = 0;
-out_free_opts:
- security_free_mnt_opts(&opts);
-out_free_secdata:
- free_secdata(secdata);
- return rc;
out_bad_option:
pr_warn("SELinux: unable to change security options "
"during remount (dev %s, type=%s)\n", sb->s_id,
sb->s_type->name);
- goto out_free_opts;
+ return -EINVAL;
}
-static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
+static int selinux_sb_kern_mount(struct super_block *sb)
{
const struct cred *cred = current_cred();
struct common_audit_data ad;
- int rc;
-
- rc = superblock_doinit(sb, data);
- if (rc)
- return rc;
-
- /* Allow all mounts performed by the kernel */
- if (flags & (MS_KERNMOUNT | MS_SUBMOUNT))
- return 0;
ad.type = LSM_AUDIT_DATA_DENTRY;
ad.u.dentry = sb->s_root;
@@ -6926,7 +6712,8 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(sb_alloc_security, selinux_sb_alloc_security),
LSM_HOOK_INIT(sb_free_security, selinux_sb_free_security),
- LSM_HOOK_INIT(sb_copy_data, selinux_sb_copy_data),
+ LSM_HOOK_INIT(sb_eat_lsm_opts, selinux_sb_eat_lsm_opts),
+ LSM_HOOK_INIT(sb_free_mnt_opts, selinux_free_mnt_opts),
LSM_HOOK_INIT(sb_remount, selinux_sb_remount),
LSM_HOOK_INIT(sb_kern_mount, selinux_sb_kern_mount),
LSM_HOOK_INIT(sb_show_options, selinux_sb_show_options),
@@ -6935,7 +6722,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(sb_umount, selinux_umount),
LSM_HOOK_INIT(sb_set_mnt_opts, selinux_set_mnt_opts),
LSM_HOOK_INIT(sb_clone_mnt_opts, selinux_sb_clone_mnt_opts),
- LSM_HOOK_INIT(sb_parse_opts_str, selinux_parse_opts_str),
+ LSM_HOOK_INIT(sb_add_mnt_opt, selinux_add_mnt_opt),
LSM_HOOK_INIT(dentry_init_security, selinux_dentry_init_security),
LSM_HOOK_INIT(dentry_create_files_as, selinux_dentry_create_files_as),
@@ -7196,7 +6983,7 @@ static __init int selinux_init(void)
static void delayed_superblock_init(struct super_block *sb, void *unused)
{
- superblock_doinit(sb, NULL);
+ selinux_set_mnt_opts(sb, NULL, 0, NULL);
}
void selinux_complete_init(void)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index cd720c06b78c..430d4f35e55c 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -59,14 +59,31 @@ static LIST_HEAD(smk_ipv6_port_list);
static struct kmem_cache *smack_inode_cache;
int smack_enabled;
-static const match_table_t smk_mount_tokens = {
- {Opt_fsdefault, SMK_FSDEFAULT "%s"},
- {Opt_fsfloor, SMK_FSFLOOR "%s"},
- {Opt_fshat, SMK_FSHAT "%s"},
- {Opt_fsroot, SMK_FSROOT "%s"},
- {Opt_fstransmute, SMK_FSTRANS "%s"},
- {Opt_error, NULL},
+#define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s}
+static struct {
+ const char *name;
+ int len;
+ int opt;
+} smk_mount_opts[] = {
+ A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute)
};
+#undef A
+
+static int match_opt_prefix(char *s, int l, char **arg)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) {
+ size_t len = smk_mount_opts[i].len;
+ if (len > l || memcmp(s, smk_mount_opts[i].name, len))
+ continue;
+ if (len == l || s[len] != '=')
+ continue;
+ *arg = s + len + 1;
+ return smk_mount_opts[i].opt;
+ }
+ return Opt_error;
+}
#ifdef CONFIG_SECURITY_SMACK_BRINGUP
static char *smk_bu_mess[] = {
@@ -567,175 +584,110 @@ static void smack_sb_free_security(struct super_block *sb)
sb->s_security = NULL;
}
-/**
- * smack_sb_copy_data - copy mount options data for processing
- * @orig: where to start
- * @smackopts: mount options string
- *
- * Returns 0 on success or -ENOMEM on error.
- *
- * Copy the Smack specific mount options out of the mount
- * options list.
- */
-static int smack_sb_copy_data(char *orig, char *smackopts)
-{
- char *cp, *commap, *otheropts, *dp;
-
- otheropts = (char *)get_zeroed_page(GFP_KERNEL);
- if (otheropts == NULL)
- return -ENOMEM;
+struct smack_mnt_opts {
+ const char *fsdefault, *fsfloor, *fshat, *fsroot, *fstransmute;
+};
- for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
- if (strstr(cp, SMK_FSDEFAULT) == cp)
- dp = smackopts;
- else if (strstr(cp, SMK_FSFLOOR) == cp)
- dp = smackopts;
- else if (strstr(cp, SMK_FSHAT) == cp)
- dp = smackopts;
- else if (strstr(cp, SMK_FSROOT) == cp)
- dp = smackopts;
- else if (strstr(cp, SMK_FSTRANS) == cp)
- dp = smackopts;
- else
- dp = otheropts;
+static void smack_free_mnt_opts(void *mnt_opts)
+{
+ struct smack_mnt_opts *opts = mnt_opts;
+ kfree(opts->fsdefault);
+ kfree(opts->fsfloor);
+ kfree(opts->fshat);
+ kfree(opts->fsroot);
+ kfree(opts->fstransmute);
+ kfree(opts);
+}
- commap = strchr(cp, ',');
- if (commap != NULL)
- *commap = '\0';
+static int smack_add_opt(int token, const char *s, void **mnt_opts)
+{
+ struct smack_mnt_opts *opts = *mnt_opts;
- if (*dp != '\0')
- strcat(dp, ",");
- strcat(dp, cp);
+ if (!opts) {
+ opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
+ if (!opts)
+ return -ENOMEM;
+ *mnt_opts = opts;
}
+ if (!s)
+ return -ENOMEM;
- strcpy(orig, otheropts);
- free_page((unsigned long)otheropts);
-
+ switch (token) {
+ case Opt_fsdefault:
+ if (opts->fsdefault)
+ goto out_opt_err;
+ opts->fsdefault = s;
+ break;
+ case Opt_fsfloor:
+ if (opts->fsfloor)
+ goto out_opt_err;
+ opts->fsfloor = s;
+ break;
+ case Opt_fshat:
+ if (opts->fshat)
+ goto out_opt_err;
+ opts->fshat = s;
+ break;
+ case Opt_fsroot:
+ if (opts->fsroot)
+ goto out_opt_err;
+ opts->fsroot = s;
+ break;
+ case Opt_fstransmute:
+ if (opts->fstransmute)
+ goto out_opt_err;
+ opts->fstransmute = s;
+ break;
+ }
return 0;
+
+out_opt_err:
+ pr_warn("Smack: duplicate mount options\n");
+ return -EINVAL;
}
-/**
- * smack_parse_opts_str - parse Smack specific mount options
- * @options: mount options string
- * @opts: where to store converted mount opts
- *
- * Returns 0 on success or -ENOMEM on error.
- *
- * converts Smack specific mount options to generic security option format
- */
-static int smack_parse_opts_str(char *options,
- struct security_mnt_opts *opts)
+static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts)
{
- char *p;
- char *fsdefault = NULL;
- char *fsfloor = NULL;
- char *fshat = NULL;
- char *fsroot = NULL;
- char *fstransmute = NULL;
- int rc = -ENOMEM;
- int num_mnt_opts = 0;
- int token;
-
- opts->num_mnt_opts = 0;
-
- if (!options)
- return 0;
-
- while ((p = strsep(&options, ",")) != NULL) {
- substring_t args[MAX_OPT_ARGS];
+ char *from = options, *to = options;
+ bool first = true;
- if (!*p)
- continue;
-
- token = match_token(p, smk_mount_tokens, args);
+ while (1) {
+ char *next = strchr(from, ',');
+ int token, len, rc;
+ char *arg = NULL;
- switch (token) {
- case Opt_fsdefault:
- if (fsdefault)
- goto out_opt_err;
- fsdefault = match_strdup(&args[0]);
- if (!fsdefault)
- goto out_err;
- break;
- case Opt_fsfloor:
- if (fsfloor)
- goto out_opt_err;
- fsfloor = match_strdup(&args[0]);
- if (!fsfloor)
- goto out_err;
- break;
- case Opt_fshat:
- if (fshat)
- goto out_opt_err;
- fshat = match_strdup(&args[0]);
- if (!fshat)
- goto out_err;
- break;
- case Opt_fsroot:
- if (fsroot)
- goto out_opt_err;
- fsroot = match_strdup(&args[0]);
- if (!fsroot)
- goto out_err;
- break;
- case Opt_fstransmute:
- if (fstransmute)
- goto out_opt_err;
- fstransmute = match_strdup(&args[0]);
- if (!fstransmute)
- goto out_err;
- break;
- default:
- rc = -EINVAL;
- pr_warn("Smack: unknown mount option\n");
- goto out_err;
+ if (next)
+ len = next - from;
+ else
+ len = strlen(from);
+
+ token = match_opt_prefix(from, len, &arg);
+ if (token != Opt_error) {
+ arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL);
+ rc = smack_add_opt(token, arg, mnt_opts);
+ if (unlikely(rc)) {
+ kfree(arg);
+ if (*mnt_opts)
+ smack_free_mnt_opts(*mnt_opts);
+ *mnt_opts = NULL;
+ return rc;
+ }
+ } else {
+ if (!first) { // copy with preceding comma
+ from--;
+ len++;
+ }
+ if (to != from)
+ memmove(to, from, len);
+ to += len;
+ first = false;
}
+ if (!from[len])
+ break;
+ from += len + 1;
}
-
- opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_KERNEL);
- if (!opts->mnt_opts)
- goto out_err;
-
- opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
- GFP_KERNEL);
- if (!opts->mnt_opts_flags)
- goto out_err;
-
- if (fsdefault) {
- opts->mnt_opts[num_mnt_opts] = fsdefault;
- opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
- }
- if (fsfloor) {
- opts->mnt_opts[num_mnt_opts] = fsfloor;
- opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
- }
- if (fshat) {
- opts->mnt_opts[num_mnt_opts] = fshat;
- opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
- }
- if (fsroot) {
- opts->mnt_opts[num_mnt_opts] = fsroot;
- opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
- }
- if (fstransmute) {
- opts->mnt_opts[num_mnt_opts] = fstransmute;
- opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
- }
-
- opts->num_mnt_opts = num_mnt_opts;
+ *to = '\0';
return 0;
-
-out_opt_err:
- rc = -EINVAL;
- pr_warn("Smack: duplicate mount options\n");
-
-out_err:
- kfree(fsdefault);
- kfree(fsfloor);
- kfree(fshat);
- kfree(fsroot);
- kfree(fstransmute);
- return rc;
}
/**
@@ -751,7 +703,7 @@ out_err:
* labels.
*/
static int smack_set_mnt_opts(struct super_block *sb,
- struct security_mnt_opts *opts,
+ void *mnt_opts,
unsigned long kern_flags,
unsigned long *set_kern_flags)
{
@@ -760,9 +712,8 @@ static int smack_set_mnt_opts(struct super_block *sb,
struct superblock_smack *sp = sb->s_security;
struct inode_smack *isp;
struct smack_known *skp;
- int i;
- int num_opts = opts->num_mnt_opts;
- int transmute = 0;
+ struct smack_mnt_opts *opts = mnt_opts;
+ bool transmute = false;
if (sp->smk_flags & SMK_SB_INITIALIZED)
return 0;
@@ -771,7 +722,7 @@ static int smack_set_mnt_opts(struct super_block *sb,
/*
* Unprivileged mounts don't get to specify Smack values.
*/
- if (num_opts)
+ if (opts)
return -EPERM;
/*
* Unprivileged mounts get root and default from the caller.
@@ -787,48 +738,44 @@ static int smack_set_mnt_opts(struct super_block *sb,
if (sb->s_user_ns != &init_user_ns &&
sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC &&
sb->s_magic != RAMFS_MAGIC) {
- transmute = 1;
+ transmute = true;
sp->smk_flags |= SMK_SB_UNTRUSTED;
}
}
sp->smk_flags |= SMK_SB_INITIALIZED;
- for (i = 0; i < num_opts; i++) {
- switch (opts->mnt_opts_flags[i]) {
- case FSDEFAULT_MNT:
- skp = smk_import_entry(opts->mnt_opts[i], 0);
+ if (opts) {
+ if (opts->fsdefault) {
+ skp = smk_import_entry(opts->fsdefault, 0);
if (IS_ERR(skp))
return PTR_ERR(skp);
sp->smk_default = skp;
- break;
- case FSFLOOR_MNT:
- skp = smk_import_entry(opts->mnt_opts[i], 0);
+ }
+ if (opts->fsfloor) {
+ skp = smk_import_entry(opts->fsfloor, 0);
if (IS_ERR(skp))
return PTR_ERR(skp);
sp->smk_floor = skp;
- break;
- case FSHAT_MNT:
- skp = smk_import_entry(opts->mnt_opts[i], 0);
+ }
+ if (opts->fshat) {
+ skp = smk_import_entry(opts->fshat, 0);
if (IS_ERR(skp))
return PTR_ERR(skp);
sp->smk_hat = skp;
- break;
- case FSROOT_MNT:
- skp = smk_import_entry(opts->mnt_opts[i], 0);
+ }
+ if (opts->fsroot) {
+ skp = smk_import_entry(opts->fsroot, 0);
if (IS_ERR(skp))
return PTR_ERR(skp);
sp->smk_root = skp;
- break;
- case FSTRANS_MNT:
- skp = smk_import_entry(opts->mnt_opts[i], 0);
+ }
+ if (opts->fstransmute) {
+ skp = smk_import_entry(opts->fstransmute, 0);
if (IS_ERR(skp))
return PTR_ERR(skp);
sp->smk_root = skp;
- transmute = 1;
- break;
- default:
- break;
+ transmute = true;
}
}
@@ -851,37 +798,6 @@ static int smack_set_mnt_opts(struct super_block *sb,
}
/**
- * smack_sb_kern_mount - Smack specific mount processing
- * @sb: the file system superblock
- * @flags: the mount flags
- * @data: the smack mount options
- *
- * Returns 0 on success, an error code on failure
- */
-static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
-{
- int rc = 0;
- char *options = data;
- struct security_mnt_opts opts;
-
- security_init_mnt_opts(&opts);
-
- if (!options)
- goto out;
-
- rc = smack_parse_opts_str(options, &opts);
- if (rc)
- goto out_err;
-
-out:
- rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
-
-out_err:
- security_free_mnt_opts(&opts);
- return rc;
-}
-
-/**
* smack_sb_statfs - Smack check on statfs
* @dentry: identifies the file system in question
*
@@ -4673,11 +4589,10 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
- LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
- LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
+ LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts),
+ LSM_HOOK_INIT(sb_eat_lsm_opts, smack_sb_eat_lsm_opts),
LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
- LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c
index 807fd91dbb54..7dc7f59b7dde 100644
--- a/security/tomoyo/mount.c
+++ b/security/tomoyo/mount.c
@@ -6,6 +6,7 @@
*/
#include <linux/slab.h>
+#include <uapi/linux/mount.h>
#include "common.h"
/* String table for special mount operations. */