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authorAndrew Morton <akpm@linux-foundation.org>2008-02-04 22:29:41 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:20 -0800
commit8f6936f4d29aa14e54a2470b954a2e1f96322988 (patch)
tree63e1bca33b783cf819b356f3ffd45cfe7b226654 /security/commoncap.c
parent4bea58053f206be9a89ca35850f9ad295dac2042 (diff)
downloadlinux-linaro-stable-8f6936f4d29aa14e54a2470b954a2e1f96322988.tar.gz
revert "capabilities: clean up file capability reading"
Revert b68680e4731abbd78863063aaa0dca2a6d8cc723 to make way for the next patch: "Add 64-bit capability support to the kernel". We want to keep the vfs_cap_data.data[] structure, using two 'data's for 64-bit caps (and later three for 96-bit caps), whereas b68680e4731abbd78863063aaa0dca2a6d8cc723 had gotten rid of the 'data' struct made its members inline. The 64-bit caps patch keeps the stack abuse fix at get_file_caps(), which was the more important part of that patch. [akpm@linux-foundation.org: coding-style fixes] Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: Serge Hallyn <serue@us.ibm.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: James Morris <jmorris@namei.org> Cc: Casey Schaufler <casey@schaufler-ca.com> Cc: Andrew Morgan <morgan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/commoncap.c')
-rw-r--r--security/commoncap.c23
1 files changed, 8 insertions, 15 deletions
diff --git a/security/commoncap.c b/security/commoncap.c
index ea61bc73f6d3..b06617b35b93 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -197,8 +197,7 @@ int cap_inode_killpriv(struct dentry *dentry)
return inode->i_op->removexattr(dentry, XATTR_NAME_CAPS);
}
-static inline int cap_from_disk(struct vfs_cap_data *caps,
- struct linux_binprm *bprm,
+static inline int cap_from_disk(__le32 *caps, struct linux_binprm *bprm,
int size)
{
__u32 magic_etc;
@@ -206,7 +205,7 @@ static inline int cap_from_disk(struct vfs_cap_data *caps,
if (size != XATTR_CAPS_SZ)
return -EINVAL;
- magic_etc = le32_to_cpu(caps->magic_etc);
+ magic_etc = le32_to_cpu(caps[0]);
switch ((magic_etc & VFS_CAP_REVISION_MASK)) {
case VFS_CAP_REVISION:
@@ -214,8 +213,8 @@ static inline int cap_from_disk(struct vfs_cap_data *caps,
bprm->cap_effective = true;
else
bprm->cap_effective = false;
- bprm->cap_permitted = to_cap_t(le32_to_cpu(caps->permitted));
- bprm->cap_inheritable = to_cap_t(le32_to_cpu(caps->inheritable));
+ bprm->cap_permitted = to_cap_t(le32_to_cpu(caps[1]));
+ bprm->cap_inheritable = to_cap_t(le32_to_cpu(caps[2]));
return 0;
default:
return -EINVAL;
@@ -227,7 +226,7 @@ static int get_file_caps(struct linux_binprm *bprm)
{
struct dentry *dentry;
int rc = 0;
- struct vfs_cap_data incaps;
+ __le32 v1caps[XATTR_CAPS_SZ];
struct inode *inode;
if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID) {
@@ -240,14 +239,8 @@ static int get_file_caps(struct linux_binprm *bprm)
if (!inode->i_op || !inode->i_op->getxattr)
goto out;
- rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, NULL, 0);
- if (rc > 0) {
- if (rc == XATTR_CAPS_SZ)
- rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS,
- &incaps, XATTR_CAPS_SZ);
- else
- rc = -EINVAL;
- }
+ rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, &v1caps,
+ XATTR_CAPS_SZ);
if (rc == -ENODATA || rc == -EOPNOTSUPP) {
/* no data, that's ok */
rc = 0;
@@ -256,7 +249,7 @@ static int get_file_caps(struct linux_binprm *bprm)
if (rc < 0)
goto out;
- rc = cap_from_disk(&incaps, bprm, rc);
+ rc = cap_from_disk(v1caps, bprm, rc);
if (rc)
printk(KERN_NOTICE "%s: cap_from_disk returned %d for %s\n",
__FUNCTION__, rc, bprm->filename);