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authorDavid Howells <dhowells@redhat.com>2008-11-14 10:39:24 +1100
committerJames Morris <jmorris@namei.org>2008-11-14 10:39:24 +1100
commita6f76f23d297f70e2a6b3ec607f7aeeea9e37e8d (patch)
tree8f95617996d0974507f176163459212a7def8b9a /security
parentd84f4f992cbd76e8f39c488cf0c5d123843923b1 (diff)
downloadlinux-a6f76f23d297f70e2a6b3ec607f7aeeea9e37e8d.tar.gz
CRED: Make execve() take advantage of copy-on-write credentials
Make execve() take advantage of copy-on-write credentials, allowing it to set up the credentials in advance, and then commit the whole lot after the point of no return. This patch and the preceding patches have been tested with the LTP SELinux testsuite. This patch makes several logical sets of alteration: (1) execve(). The credential bits from struct linux_binprm are, for the most part, replaced with a single credentials pointer (bprm->cred). This means that all the creds can be calculated in advance and then applied at the point of no return with no possibility of failure. I would like to replace bprm->cap_effective with: cap_isclear(bprm->cap_effective) but this seems impossible due to special behaviour for processes of pid 1 (they always retain their parent's capability masks where normally they'd be changed - see cap_bprm_set_creds()). The following sequence of events now happens: (a) At the start of do_execve, the current task's cred_exec_mutex is locked to prevent PTRACE_ATTACH from obsoleting the calculation of creds that we make. (a) prepare_exec_creds() is then called to make a copy of the current task's credentials and prepare it. This copy is then assigned to bprm->cred. This renders security_bprm_alloc() and security_bprm_free() unnecessary, and so they've been removed. (b) The determination of unsafe execution is now performed immediately after (a) rather than later on in the code. The result is stored in bprm->unsafe for future reference. (c) prepare_binprm() is called, possibly multiple times. (i) This applies the result of set[ug]id binaries to the new creds attached to bprm->cred. Personality bit clearance is recorded, but now deferred on the basis that the exec procedure may yet fail. (ii) This then calls the new security_bprm_set_creds(). This should calculate the new LSM and capability credentials into *bprm->cred. This folds together security_bprm_set() and parts of security_bprm_apply_creds() (these two have been removed). Anything that might fail must be done at this point. (iii) bprm->cred_prepared is set to 1. bprm->cred_prepared is 0 on the first pass of the security calculations, and 1 on all subsequent passes. This allows SELinux in (ii) to base its calculations only on the initial script and not on the interpreter. (d) flush_old_exec() is called to commit the task to execution. This performs the following steps with regard to credentials: (i) Clear pdeath_signal and set dumpable on certain circumstances that may not be covered by commit_creds(). (ii) Clear any bits in current->personality that were deferred from (c.i). (e) install_exec_creds() [compute_creds() as was] is called to install the new credentials. This performs the following steps with regard to credentials: (i) Calls security_bprm_committing_creds() to apply any security requirements, such as flushing unauthorised files in SELinux, that must be done before the credentials are changed. This is made up of bits of security_bprm_apply_creds() and security_bprm_post_apply_creds(), both of which have been removed. This function is not allowed to fail; anything that might fail must have been done in (c.ii). (ii) Calls commit_creds() to apply the new credentials in a single assignment (more or less). Possibly pdeath_signal and dumpable should be part of struct creds. (iii) Unlocks the task's cred_replace_mutex, thus allowing PTRACE_ATTACH to take place. (iv) Clears The bprm->cred pointer as the credentials it was holding are now immutable. (v) Calls security_bprm_committed_creds() to apply any security alterations that must be done after the creds have been changed. SELinux uses this to flush signals and signal handlers. (f) If an error occurs before (d.i), bprm_free() will call abort_creds() to destroy the proposed new credentials and will then unlock cred_replace_mutex. No changes to the credentials will have been made. (2) LSM interface. A number of functions have been changed, added or removed: (*) security_bprm_alloc(), ->bprm_alloc_security() (*) security_bprm_free(), ->bprm_free_security() Removed in favour of preparing new credentials and modifying those. (*) security_bprm_apply_creds(), ->bprm_apply_creds() (*) security_bprm_post_apply_creds(), ->bprm_post_apply_creds() Removed; split between security_bprm_set_creds(), security_bprm_committing_creds() and security_bprm_committed_creds(). (*) security_bprm_set(), ->bprm_set_security() Removed; folded into security_bprm_set_creds(). (*) security_bprm_set_creds(), ->bprm_set_creds() New. The new credentials in bprm->creds should be checked and set up as appropriate. bprm->cred_prepared is 0 on the first call, 1 on the second and subsequent calls. (*) security_bprm_committing_creds(), ->bprm_committing_creds() (*) security_bprm_committed_creds(), ->bprm_committed_creds() New. Apply the security effects of the new credentials. This includes closing unauthorised files in SELinux. This function may not fail. When the former is called, the creds haven't yet been applied to the process; when the latter is called, they have. The former may access bprm->cred, the latter may not. (3) SELinux. SELinux has a number of changes, in addition to those to support the LSM interface changes mentioned above: (a) The bprm_security_struct struct has been removed in favour of using the credentials-under-construction approach. (c) flush_unauthorized_files() now takes a cred pointer and passes it on to inode_has_perm(), file_has_perm() and dentry_open(). Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/capability.c19
-rw-r--r--security/commoncap.c152
-rw-r--r--security/keys/process_keys.c42
-rw-r--r--security/root_plug.c13
-rw-r--r--security/security.c26
-rw-r--r--security/selinux/hooks.c283
-rw-r--r--security/selinux/include/objsec.h11
-rw-r--r--security/smack/smack_lsm.c3
8 files changed, 214 insertions, 335 deletions
diff --git a/security/capability.c b/security/capability.c
index efeb6d9e0e6a..185804f99ad1 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -32,24 +32,19 @@ static int cap_quota_on(struct dentry *dentry)
return 0;
}
-static int cap_bprm_alloc_security(struct linux_binprm *bprm)
+static int cap_bprm_check_security (struct linux_binprm *bprm)
{
return 0;
}
-static void cap_bprm_free_security(struct linux_binprm *bprm)
+static void cap_bprm_committing_creds(struct linux_binprm *bprm)
{
}
-static void cap_bprm_post_apply_creds(struct linux_binprm *bprm)
+static void cap_bprm_committed_creds(struct linux_binprm *bprm)
{
}
-static int cap_bprm_check_security(struct linux_binprm *bprm)
-{
- return 0;
-}
-
static int cap_sb_alloc_security(struct super_block *sb)
{
return 0;
@@ -827,11 +822,9 @@ void security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, syslog);
set_to_cap_if_null(ops, settime);
set_to_cap_if_null(ops, vm_enough_memory);
- set_to_cap_if_null(ops, bprm_alloc_security);
- set_to_cap_if_null(ops, bprm_free_security);
- set_to_cap_if_null(ops, bprm_apply_creds);
- set_to_cap_if_null(ops, bprm_post_apply_creds);
- set_to_cap_if_null(ops, bprm_set_security);
+ set_to_cap_if_null(ops, bprm_set_creds);
+ set_to_cap_if_null(ops, bprm_committing_creds);
+ set_to_cap_if_null(ops, bprm_committed_creds);
set_to_cap_if_null(ops, bprm_check_security);
set_to_cap_if_null(ops, bprm_secureexec);
set_to_cap_if_null(ops, sb_alloc_security);
diff --git a/security/commoncap.c b/security/commoncap.c
index b5419273f92d..51dfa11e8e56 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -167,7 +167,7 @@ int cap_capset(struct cred *new,
static inline void bprm_clear_caps(struct linux_binprm *bprm)
{
- cap_clear(bprm->cap_post_exec_permitted);
+ cap_clear(bprm->cred->cap_permitted);
bprm->cap_effective = false;
}
@@ -198,15 +198,15 @@ int cap_inode_killpriv(struct dentry *dentry)
}
static inline int bprm_caps_from_vfs_caps(struct cpu_vfs_cap_data *caps,
- struct linux_binprm *bprm)
+ struct linux_binprm *bprm,
+ bool *effective)
{
+ struct cred *new = bprm->cred;
unsigned i;
int ret = 0;
if (caps->magic_etc & VFS_CAP_FLAGS_EFFECTIVE)
- bprm->cap_effective = true;
- else
- bprm->cap_effective = false;
+ *effective = true;
CAP_FOR_EACH_U32(i) {
__u32 permitted = caps->permitted.cap[i];
@@ -215,16 +215,13 @@ static inline int bprm_caps_from_vfs_caps(struct cpu_vfs_cap_data *caps,
/*
* pP' = (X & fP) | (pI & fI)
*/
- bprm->cap_post_exec_permitted.cap[i] =
- (current->cred->cap_bset.cap[i] & permitted) |
- (current->cred->cap_inheritable.cap[i] & inheritable);
+ new->cap_permitted.cap[i] =
+ (new->cap_bset.cap[i] & permitted) |
+ (new->cap_inheritable.cap[i] & inheritable);
- if (permitted & ~bprm->cap_post_exec_permitted.cap[i]) {
- /*
- * insufficient to execute correctly
- */
+ if (permitted & ~new->cap_permitted.cap[i])
+ /* insufficient to execute correctly */
ret = -EPERM;
- }
}
/*
@@ -232,7 +229,7 @@ static inline int bprm_caps_from_vfs_caps(struct cpu_vfs_cap_data *caps,
* do not have enough capabilities, we return an error if they are
* missing some "forced" (aka file-permitted) capabilities.
*/
- return bprm->cap_effective ? ret : 0;
+ return *effective ? ret : 0;
}
int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps)
@@ -250,10 +247,9 @@ int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data
size = inode->i_op->getxattr((struct dentry *)dentry, XATTR_NAME_CAPS, &caps,
XATTR_CAPS_SZ);
- if (size == -ENODATA || size == -EOPNOTSUPP) {
+ if (size == -ENODATA || size == -EOPNOTSUPP)
/* no data, that's ok */
return -ENODATA;
- }
if (size < 0)
return size;
@@ -262,7 +258,7 @@ int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data
cpu_caps->magic_etc = magic_etc = le32_to_cpu(caps.magic_etc);
- switch ((magic_etc & VFS_CAP_REVISION_MASK)) {
+ switch (magic_etc & VFS_CAP_REVISION_MASK) {
case VFS_CAP_REVISION_1:
if (size != XATTR_CAPS_SZ_1)
return -EINVAL;
@@ -283,11 +279,12 @@ int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data
cpu_caps->permitted.cap[i] = le32_to_cpu(caps.data[i].permitted);
cpu_caps->inheritable.cap[i] = le32_to_cpu(caps.data[i].inheritable);
}
+
return 0;
}
/* Locate any VFS capabilities: */
-static int get_file_caps(struct linux_binprm *bprm)
+static int get_file_caps(struct linux_binprm *bprm, bool *effective)
{
struct dentry *dentry;
int rc = 0;
@@ -313,7 +310,10 @@ static int get_file_caps(struct linux_binprm *bprm)
goto out;
}
- rc = bprm_caps_from_vfs_caps(&vcaps, bprm);
+ rc = bprm_caps_from_vfs_caps(&vcaps, bprm, effective);
+ if (rc == -EINVAL)
+ printk(KERN_NOTICE "%s: cap_from_disk returned %d for %s\n",
+ __func__, rc, bprm->filename);
out:
dput(dentry);
@@ -334,18 +334,27 @@ int cap_inode_killpriv(struct dentry *dentry)
return 0;
}
-static inline int get_file_caps(struct linux_binprm *bprm)
+static inline int get_file_caps(struct linux_binprm *bprm, bool *effective)
{
bprm_clear_caps(bprm);
return 0;
}
#endif
-int cap_bprm_set_security (struct linux_binprm *bprm)
+/*
+ * set up the new credentials for an exec'd task
+ */
+int cap_bprm_set_creds(struct linux_binprm *bprm)
{
+ const struct cred *old = current_cred();
+ struct cred *new = bprm->cred;
+ bool effective;
int ret;
- ret = get_file_caps(bprm);
+ effective = false;
+ ret = get_file_caps(bprm, &effective);
+ if (ret < 0)
+ return ret;
if (!issecure(SECURE_NOROOT)) {
/*
@@ -353,63 +362,47 @@ int cap_bprm_set_security (struct linux_binprm *bprm)
* executables under compatibility mode, we override the
* capability sets for the file.
*
- * If only the real uid is 0, we do not set the effective
- * bit.
+ * If only the real uid is 0, we do not set the effective bit.
*/
- if (bprm->e_uid == 0 || current_uid() == 0) {
+ if (new->euid == 0 || new->uid == 0) {
/* pP' = (cap_bset & ~0) | (pI & ~0) */
- bprm->cap_post_exec_permitted = cap_combine(
- current->cred->cap_bset,
- current->cred->cap_inheritable);
- bprm->cap_effective = (bprm->e_uid == 0);
- ret = 0;
+ new->cap_permitted = cap_combine(old->cap_bset,
+ old->cap_inheritable);
}
+ if (new->euid == 0)
+ effective = true;
}
- return ret;
-}
-
-int cap_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
-{
- const struct cred *old = current_cred();
- struct cred *new;
-
- new = prepare_creds();
- if (!new)
- return -ENOMEM;
-
- if (bprm->e_uid != old->uid || bprm->e_gid != old->gid ||
- !cap_issubset(bprm->cap_post_exec_permitted,
- old->cap_permitted)) {
- set_dumpable(current->mm, suid_dumpable);
- current->pdeath_signal = 0;
-
- if (unsafe & ~LSM_UNSAFE_PTRACE_CAP) {
- if (!capable(CAP_SETUID)) {
- bprm->e_uid = old->uid;
- bprm->e_gid = old->gid;
- }
- if (cap_limit_ptraced_target()) {
- bprm->cap_post_exec_permitted = cap_intersect(
- bprm->cap_post_exec_permitted,
- new->cap_permitted);
- }
+ /* Don't let someone trace a set[ug]id/setpcap binary with the revised
+ * credentials unless they have the appropriate permit
+ */
+ if ((new->euid != old->uid ||
+ new->egid != old->gid ||
+ !cap_issubset(new->cap_permitted, old->cap_permitted)) &&
+ bprm->unsafe & ~LSM_UNSAFE_PTRACE_CAP) {
+ /* downgrade; they get no more than they had, and maybe less */
+ if (!capable(CAP_SETUID)) {
+ new->euid = new->uid;
+ new->egid = new->gid;
}
+ if (cap_limit_ptraced_target())
+ new->cap_permitted = cap_intersect(new->cap_permitted,
+ old->cap_permitted);
}
- new->suid = new->euid = new->fsuid = bprm->e_uid;
- new->sgid = new->egid = new->fsgid = bprm->e_gid;
+ new->suid = new->fsuid = new->euid;
+ new->sgid = new->fsgid = new->egid;
- /* For init, we want to retain the capabilities set
- * in the init_task struct. Thus we skip the usual
- * capability rules */
+ /* For init, we want to retain the capabilities set in the initial
+ * task. Thus we skip the usual capability rules
+ */
if (!is_global_init(current)) {
- new->cap_permitted = bprm->cap_post_exec_permitted;
- if (bprm->cap_effective)
- new->cap_effective = bprm->cap_post_exec_permitted;
+ if (effective)
+ new->cap_effective = new->cap_permitted;
else
cap_clear(new->cap_effective);
}
+ bprm->cap_effective = effective;
/*
* Audit candidate if current->cap_effective is set
@@ -425,23 +418,31 @@ int cap_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
*/
if (!cap_isclear(new->cap_effective)) {
if (!cap_issubset(CAP_FULL_SET, new->cap_effective) ||
- bprm->e_uid != 0 || new->uid != 0 ||
- issecure(SECURE_NOROOT))
- audit_log_bprm_fcaps(bprm, new, old);
+ new->euid != 0 || new->uid != 0 ||
+ issecure(SECURE_NOROOT)) {
+ ret = audit_log_bprm_fcaps(bprm, new, old);
+ if (ret < 0)
+ return ret;
+ }
}
new->securebits &= ~issecure_mask(SECURE_KEEP_CAPS);
- return commit_creds(new);
+ return 0;
}
-int cap_bprm_secureexec (struct linux_binprm *bprm)
+/*
+ * determine whether a secure execution is required
+ * - the creds have been committed at this point, and are no longer available
+ * through bprm
+ */
+int cap_bprm_secureexec(struct linux_binprm *bprm)
{
const struct cred *cred = current_cred();
if (cred->uid != 0) {
if (bprm->cap_effective)
return 1;
- if (!cap_isclear(bprm->cap_post_exec_permitted))
+ if (!cap_isclear(cred->cap_permitted))
return 1;
}
@@ -477,7 +478,7 @@ int cap_inode_removexattr(struct dentry *dentry, const char *name)
}
/* moved from kernel/sys.c. */
-/*
+/*
* cap_emulate_setxuid() fixes the effective / permitted capabilities of
* a process after a call to setuid, setreuid, or setresuid.
*
@@ -491,10 +492,10 @@ int cap_inode_removexattr(struct dentry *dentry, const char *name)
* 3) When set*uiding _from_ euid != 0 _to_ euid == 0, the effective
* capabilities are set to the permitted capabilities.
*
- * fsuid is handled elsewhere. fsuid == 0 and {r,e,s}uid!= 0 should
+ * fsuid is handled elsewhere. fsuid == 0 and {r,e,s}uid!= 0 should
* never happen.
*
- * -astor
+ * -astor
*
* cevans - New behaviour, Oct '99
* A process may, via prctl(), elect to keep its capabilities when it
@@ -751,4 +752,3 @@ int cap_vm_enough_memory(struct mm_struct *mm, long pages)
cap_sys_admin = 1;
return __vm_enough_memory(mm, pages, cap_sys_admin);
}
-
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index df329f684a65..2f5d89e92b85 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -276,48 +276,6 @@ static int install_session_keyring(struct key *keyring)
/*****************************************************************************/
/*
- * deal with execve()
- */
-int exec_keys(struct task_struct *tsk)
-{
- struct thread_group_cred *tgcred = NULL;
- struct cred *new;
-
-#ifdef CONFIG_KEYS
- tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
- if (!tgcred)
- return -ENOMEM;
-#endif
-
- new = prepare_creds();
- if (new < 0)
- return -ENOMEM;
-
- /* newly exec'd tasks don't get a thread keyring */
- key_put(new->thread_keyring);
- new->thread_keyring = NULL;
-
- /* create a new per-thread-group creds for all this set of threads to
- * share */
- memcpy(tgcred, new->tgcred, sizeof(struct thread_group_cred));
-
- atomic_set(&tgcred->usage, 1);
- spin_lock_init(&tgcred->lock);
-
- /* inherit the session keyring; new process keyring */
- key_get(tgcred->session_keyring);
- tgcred->process_keyring = NULL;
-
- release_tgcred(new);
- new->tgcred = tgcred;
-
- commit_creds(new);
- return 0;
-
-} /* end exec_keys() */
-
-/*****************************************************************************/
-/*
* the filesystem user ID changed
*/
void key_fsuid_changed(struct task_struct *tsk)
diff --git a/security/root_plug.c b/security/root_plug.c
index c3f68b5b372d..40fb4f15e27b 100644
--- a/security/root_plug.c
+++ b/security/root_plug.c
@@ -55,9 +55,9 @@ static int rootplug_bprm_check_security (struct linux_binprm *bprm)
struct usb_device *dev;
root_dbg("file %s, e_uid = %d, e_gid = %d\n",
- bprm->filename, bprm->e_uid, bprm->e_gid);
+ bprm->filename, bprm->cred->euid, bprm->cred->egid);
- if (bprm->e_gid == 0) {
+ if (bprm->cred->egid == 0) {
dev = usb_find_device(vendor_id, product_id);
if (!dev) {
root_dbg("e_gid = 0, and device not found, "
@@ -75,15 +75,12 @@ static struct security_operations rootplug_security_ops = {
.ptrace_may_access = cap_ptrace_may_access,
.ptrace_traceme = cap_ptrace_traceme,
.capget = cap_capget,
- .capset_check = cap_capset_check,
- .capset_set = cap_capset_set,
+ .capset = cap_capset,
.capable = cap_capable,
- .bprm_apply_creds = cap_bprm_apply_creds,
- .bprm_set_security = cap_bprm_set_security,
+ .bprm_set_creds = cap_bprm_set_creds,
- .task_post_setuid = cap_task_post_setuid,
- .task_reparent_to_init = cap_task_reparent_to_init,
+ .task_fix_setuid = cap_task_fix_setuid,
.task_prctl = cap_task_prctl,
.bprm_check_security = rootplug_bprm_check_security,
diff --git a/security/security.c b/security/security.c
index a55d739c6864..dc5babb2d6d8 100644
--- a/security/security.c
+++ b/security/security.c
@@ -213,34 +213,24 @@ int security_vm_enough_memory_kern(long pages)
return security_ops->vm_enough_memory(current->mm, pages);
}
-int security_bprm_alloc(struct linux_binprm *bprm)
+int security_bprm_set_creds(struct linux_binprm *bprm)
{
- return security_ops->bprm_alloc_security(bprm);
+ return security_ops->bprm_set_creds(bprm);
}
-void security_bprm_free(struct linux_binprm *bprm)
-{
- security_ops->bprm_free_security(bprm);
-}
-
-int security_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
-{
- return security_ops->bprm_apply_creds(bprm, unsafe);
-}
-
-void security_bprm_post_apply_creds(struct linux_binprm *bprm)
+int security_bprm_check(struct linux_binprm *bprm)
{
- security_ops->bprm_post_apply_creds(bprm);
+ return security_ops->bprm_check_security(bprm);
}
-int security_bprm_set(struct linux_binprm *bprm)
+void security_bprm_committing_creds(struct linux_binprm *bprm)
{
- return security_ops->bprm_set_security(bprm);
+ return security_ops->bprm_committing_creds(bprm);
}
-int security_bprm_check(struct linux_binprm *bprm)
+void security_bprm_committed_creds(struct linux_binprm *bprm)
{
- return security_ops->bprm_check_security(bprm);
+ return security_ops->bprm_committed_creds(bprm);
}
int security_bprm_secureexec(struct linux_binprm *bprm)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index c71bba78872f..21a592184633 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2029,59 +2029,45 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
/* binprm security operations */
-static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
+static int selinux_bprm_set_creds(struct linux_binprm *bprm)
{
- struct bprm_security_struct *bsec;
-
- bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
- if (!bsec)
- return -ENOMEM;
-
- bsec->sid = SECINITSID_UNLABELED;
- bsec->set = 0;
-
- bprm->security = bsec;
- return 0;
-}
-
-static int selinux_bprm_set_security(struct linux_binprm *bprm)
-{
- struct task_security_struct *tsec;
- struct inode *inode = bprm->file->f_path.dentry->d_inode;
+ const struct task_security_struct *old_tsec;
+ struct task_security_struct *new_tsec;
struct inode_security_struct *isec;
- struct bprm_security_struct *bsec;
- u32 newsid;
struct avc_audit_data ad;
+ struct inode *inode = bprm->file->f_path.dentry->d_inode;
int rc;
- rc = secondary_ops->bprm_set_security(bprm);
+ rc = secondary_ops->bprm_set_creds(bprm);
if (rc)
return rc;
- bsec = bprm->security;
-
- if (bsec->set)
+ /* SELinux context only depends on initial program or script and not
+ * the script interpreter */
+ if (bprm->cred_prepared)
return 0;
- tsec = current_security();
+ old_tsec = current_security();
+ new_tsec = bprm->cred->security;
isec = inode->i_security;
/* Default to the current task SID. */
- bsec->sid = tsec->sid;
+ new_tsec->sid = old_tsec->sid;
+ new_tsec->osid = old_tsec->sid;
/* Reset fs, key, and sock SIDs on execve. */
- tsec->create_sid = 0;
- tsec->keycreate_sid = 0;
- tsec->sockcreate_sid = 0;
+ new_tsec->create_sid = 0;
+ new_tsec->keycreate_sid = 0;
+ new_tsec->sockcreate_sid = 0;
- if (tsec->exec_sid) {
- newsid = tsec->exec_sid;
+ if (old_tsec->exec_sid) {
+ new_tsec->sid = old_tsec->exec_sid;
/* Reset exec SID on execve. */
- tsec->exec_sid = 0;
+ new_tsec->exec_sid = 0;
} else {
/* Check for a default transition on this program. */
- rc = security_transition_sid(tsec->sid, isec->sid,
- SECCLASS_PROCESS, &newsid);
+ rc = security_transition_sid(old_tsec->sid, isec->sid,
+ SECCLASS_PROCESS, &new_tsec->sid);
if (rc)
return rc;
}
@@ -2090,33 +2076,63 @@ static int selinux_bprm_set_security(struct linux_binprm *bprm)
ad.u.fs.path = bprm->file->f_path;
if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
- newsid = tsec->sid;
+ new_tsec->sid = old_tsec->sid;
- if (tsec->sid == newsid) {
- rc = avc_has_perm(tsec->sid, isec->sid,
+ if (new_tsec->sid == old_tsec->sid) {
+ rc = avc_has_perm(old_tsec->sid, isec->sid,
SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
if (rc)
return rc;
} else {
/* Check permissions for the transition. */
- rc = avc_has_perm(tsec->sid, newsid,
+ rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
if (rc)
return rc;
- rc = avc_has_perm(newsid, isec->sid,
+ rc = avc_has_perm(new_tsec->sid, isec->sid,
SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
if (rc)
return rc;
- /* Clear any possibly unsafe personality bits on exec: */
- current->personality &= ~PER_CLEAR_ON_SETID;
+ /* Check for shared state */
+ if (bprm->unsafe & LSM_UNSAFE_SHARE) {
+ rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
+ SECCLASS_PROCESS, PROCESS__SHARE,
+ NULL);
+ if (rc)
+ return -EPERM;
+ }
+
+ /* Make sure that anyone attempting to ptrace over a task that
+ * changes its SID has the appropriate permit */
+ if (bprm->unsafe &
+ (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
+ struct task_struct *tracer;
+ struct task_security_struct *sec;
+ u32 ptsid = 0;
+
+ rcu_read_lock();
+ tracer = tracehook_tracer_task(current);
+ if (likely(tracer != NULL)) {
+ sec = __task_cred(tracer)->security;
+ ptsid = sec->sid;
+ }
+ rcu_read_unlock();
+
+ if (ptsid != 0) {
+ rc = avc_has_perm(ptsid, new_tsec->sid,
+ SECCLASS_PROCESS,
+ PROCESS__PTRACE, NULL);
+ if (rc)
+ return -EPERM;
+ }
+ }
- /* Set the security field to the new SID. */
- bsec->sid = newsid;
+ /* Clear any possibly unsafe personality bits on exec: */
+ bprm->per_clear |= PER_CLEAR_ON_SETID;
}
- bsec->set = 1;
return 0;
}
@@ -2125,7 +2141,6 @@ static int selinux_bprm_check_security(struct linux_binprm *bprm)
return secondary_ops->bprm_check_security(bprm);
}
-
static int selinux_bprm_secureexec(struct linux_binprm *bprm)
{
const struct cred *cred = current_cred();
@@ -2141,19 +2156,13 @@ static int selinux_bprm_secureexec(struct linux_binprm *bprm)
the noatsecure permission is granted between
the two SIDs, i.e. ahp returns 0. */
atsecure = avc_has_perm(osid, sid,
- SECCLASS_PROCESS,
- PROCESS__NOATSECURE, NULL);
+ SECCLASS_PROCESS,
+ PROCESS__NOATSECURE, NULL);
}
return (atsecure || secondary_ops->bprm_secureexec(bprm));
}
-static void selinux_bprm_free_security(struct linux_binprm *bprm)
-{
- kfree(bprm->security);
- bprm->security = NULL;
-}
-
extern struct vfsmount *selinuxfs_mount;
extern struct dentry *selinux_null;
@@ -2252,108 +2261,78 @@ static inline void flush_unauthorized_files(const struct cred *cred,
spin_unlock(&files->file_lock);
}
-static int selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
+/*
+ * Prepare a process for imminent new credential changes due to exec
+ */
+static void selinux_bprm_committing_creds(struct linux_binprm *bprm)
{
- struct task_security_struct *tsec;
- struct bprm_security_struct *bsec;
- struct cred *new;
- u32 sid;
- int rc;
-
- rc = secondary_ops->bprm_apply_creds(bprm, unsafe);
- if (rc < 0)
- return rc;
-
- new = prepare_creds();
- if (!new)
- return -ENOMEM;
+ struct task_security_struct *new_tsec;
+ struct rlimit *rlim, *initrlim;
+ int rc, i;
- tsec = new->security;
+ secondary_ops->bprm_committing_creds(bprm);
- bsec = bprm->security;
- sid = bsec->sid;
-
- tsec->osid = tsec->sid;
- bsec->unsafe = 0;
- if (tsec->sid != sid) {
- /* Check for shared state. If not ok, leave SID
- unchanged and kill. */
- if (unsafe & LSM_UNSAFE_SHARE) {
- rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
- PROCESS__SHARE, NULL);
- if (rc) {
- bsec->unsafe = 1;
- goto out;
- }
- }
+ new_tsec = bprm->cred->security;
+ if (new_tsec->sid == new_tsec->osid)
+ return;
- /* Check for ptracing, and update the task SID if ok.
- Otherwise, leave SID unchanged and kill. */
- if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
- struct task_struct *tracer;
- struct task_security_struct *sec;
- u32 ptsid = 0;
+ /* Close files for which the new task SID is not authorized. */
+ flush_unauthorized_files(bprm->cred, current->files);
- rcu_read_lock();
- tracer = tracehook_tracer_task(current);
- if (likely(tracer != NULL)) {
- sec = __task_cred(tracer)->security;
- ptsid = sec->sid;
- }
- rcu_read_unlock();
+ /* Always clear parent death signal on SID transitions. */
+ current->pdeath_signal = 0;
- if (ptsid != 0) {
- rc = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
- PROCESS__PTRACE, NULL);
- if (rc) {
- bsec->unsafe = 1;
- goto out;
- }
- }
+ /* Check whether the new SID can inherit resource limits from the old
+ * SID. If not, reset all soft limits to the lower of the current
+ * task's hard limit and the init task's soft limit.
+ *
+ * Note that the setting of hard limits (even to lower them) can be
+ * controlled by the setrlimit check. The inclusion of the init task's
+ * soft limit into the computation is to avoid resetting soft limits
+ * higher than the default soft limit for cases where the default is
+ * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK.
+ */
+ rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS,
+ PROCESS__RLIMITINH, NULL);
+ if (rc) {
+ for (i = 0; i < RLIM_NLIMITS; i++) {
+ rlim = current->signal->rlim + i;
+ initrlim = init_task.signal->rlim + i;
+ rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
}
- tsec->sid = sid;
+ update_rlimit_cpu(rlim->rlim_cur);
}
-
-out:
- commit_creds(new);
- return 0;
}
/*
- * called after apply_creds without the task lock held
+ * Clean up the process immediately after the installation of new credentials
+ * due to exec
*/
-static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
+static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
{
- const struct cred *cred = current_cred();
- struct task_security_struct *tsec;
- struct rlimit *rlim, *initrlim;
+ const struct task_security_struct *tsec = current_security();
struct itimerval itimer;
- struct bprm_security_struct *bsec;
struct sighand_struct *psig;
+ u32 osid, sid;
int rc, i;
unsigned long flags;
- tsec = current_security();
- bsec = bprm->security;
+ secondary_ops->bprm_committed_creds(bprm);
- if (bsec->unsafe) {
- force_sig_specific(SIGKILL, current);
- return;
- }
- if (tsec->osid == tsec->sid)
+ osid = tsec->osid;
+ sid = tsec->sid;
+
+ if (sid == osid)
return;
- /* Close files for which the new task SID is not authorized. */
- flush_unauthorized_files(cred, current->files);
-
- /* Check whether the new SID can inherit signal state
- from the old SID. If not, clear itimers to avoid
- subsequent signal generation and flush and unblock
- signals. This must occur _after_ the task SID has
- been updated so that any kill done after the flush
- will be checked against the new SID. */
- rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
- PROCESS__SIGINH, NULL);
+ /* Check whether the new SID can inherit signal state from the old SID.
+ * If not, clear itimers to avoid subsequent signal generation and
+ * flush and unblock signals.
+ *
+ * This must occur _after_ the task SID has been updated so that any
+ * kill done after the flush will be checked against the new SID.
+ */
+ rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
if (rc) {
memset(&itimer, 0, sizeof itimer);
for (i = 0; i < 3; i++)
@@ -2366,32 +2345,8 @@ static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
spin_unlock_irq(&current->sighand->siglock);
}
- /* Always clear parent death signal on SID transitions. */
- current->pdeath_signal = 0;
-
- /* Check whether the new SID can inherit resource limits
- from the old SID. If not, reset all soft limits to
- the lower of the current task's hard limit and the init
- task's soft limit. Note that the setting of hard limits
- (even to lower them) can be controlled by the setrlimit
- check. The inclusion of the init task's soft limit into
- the computation is to avoid resetting soft limits higher
- than the default soft limit for cases where the default
- is lower than the hard limit, e.g. RLIMIT_CORE or
- RLIMIT_STACK.*/
- rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
- PROCESS__RLIMITINH, NULL);
- if (rc) {
- for (i = 0; i < RLIM_NLIMITS; i++) {
- rlim = current->signal->rlim + i;
- initrlim = init_task.signal->rlim+i;
- rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
- }
- update_rlimit_cpu(rlim->rlim_cur);
- }
-
- /* Wake up the parent if it is waiting so that it can
- recheck wait permission to the new task SID. */
+ /* Wake up the parent if it is waiting so that it can recheck
+ * wait permission to the new task SID. */
read_lock_irq(&tasklist_lock);
psig = current->parent->sighand;
spin_lock_irqsave(&psig->siglock, flags);
@@ -5556,12 +5511,10 @@ static struct security_operations selinux_ops = {
.netlink_send = selinux_netlink_send,
.netlink_recv = selinux_netlink_recv,
- .bprm_alloc_security = selinux_bprm_alloc_security,
- .bprm_free_security = selinux_bprm_free_security,
- .bprm_apply_creds = selinux_bprm_apply_creds,
- .bprm_post_apply_creds = selinux_bprm_post_apply_creds,
- .bprm_set_security = selinux_bprm_set_security,
+ .bprm_set_creds = selinux_bprm_set_creds,
.bprm_check_security = selinux_bprm_check_security,
+ .bprm_committing_creds = selinux_bprm_committing_creds,
+ .bprm_committed_creds = selinux_bprm_committed_creds,
.bprm_secureexec = selinux_bprm_secureexec,
.sb_alloc_security = selinux_sb_alloc_security,
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index f8be8d7fa26d..3cc45168f674 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -77,17 +77,6 @@ struct ipc_security_struct {
u32 sid; /* SID of IPC resource */
};
-struct bprm_security_struct {
- u32 sid; /* SID for transformed process */
- unsigned char set;
-
- /*
- * unsafe is used to share failure information from bprm_apply_creds()
- * to bprm_post_apply_creds().
- */
- char unsafe;
-};
-
struct netif_security_struct {
int ifindex; /* device index */
u32 sid; /* SID for this interface */
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index e952b397153d..de396742abf4 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2596,8 +2596,7 @@ struct security_operations smack_ops = {
.settime = cap_settime,
.vm_enough_memory = cap_vm_enough_memory,
- .bprm_apply_creds = cap_bprm_apply_creds,
- .bprm_set_security = cap_bprm_set_security,
+ .bprm_set_creds = cap_bprm_set_creds,
.bprm_secureexec = cap_bprm_secureexec,
.sb_alloc_security = smack_sb_alloc_security,