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capabilities: clean up file capability reading 

Simplify the vfs_cap_data structure.

Also fix get_file_caps which was declaring
__le32 v1caps[XATTR_CAPS_SZ] on the stack, but
XATTR_CAPS_SZ is already * sizeof(__le32).

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: Andrew Morgan <morgan@kernel.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Serge E. Hallyn 2007-10-21 16:41:38 -07:00 committed by Linus Torvalds
parent b9049e2344
commit b68680e473
2 changed files with 17 additions and 12 deletions
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6
include/linux/capability.h
View File

@ -56,10 +56,8 @@ typedef struct __user_cap_data_struct {
struct vfs_cap_data {
__u32 magic_etc; /* Little endian */
struct {
__u32 permitted; /* Little endian */
__u32 inheritable; /* Little endian */
} data[1];
__u32 permitted; /* Little endian */
__u32 inheritable; /* Little endian */
};
#ifdef __KERNEL__

23
security/commoncap.c
View File

@ -190,7 +190,8 @@ int cap_inode_killpriv(struct dentry *dentry)
return inode->i_op->removexattr(dentry, XATTR_NAME_CAPS);
}
static inline int cap_from_disk(__le32 *caps, struct linux_binprm *bprm,
static inline int cap_from_disk(struct vfs_cap_data *caps,
struct linux_binprm *bprm,
int size)
{
__u32 magic_etc;
@ -198,7 +199,7 @@ static inline int cap_from_disk(__le32 *caps, struct linux_binprm *bprm,
if (size != XATTR_CAPS_SZ)
return -EINVAL;
magic_etc = le32_to_cpu(caps[0]);
magic_etc = le32_to_cpu(caps->magic_etc);
switch ((magic_etc & VFS_CAP_REVISION_MASK)) {
case VFS_CAP_REVISION:
@ -206,8 +207,8 @@ static inline int cap_from_disk(__le32 *caps, struct linux_binprm *bprm,
bprm->cap_effective = true;
else
bprm->cap_effective = false;
bprm->cap_permitted = to_cap_t( le32_to_cpu(caps[1]) );
bprm->cap_inheritable = to_cap_t( le32_to_cpu(caps[2]) );
bprm->cap_permitted = to_cap_t(le32_to_cpu(caps->permitted));
bprm->cap_inheritable = to_cap_t(le32_to_cpu(caps->inheritable));
return 0;
default:
return -EINVAL;
@ -219,7 +220,7 @@ static int get_file_caps(struct linux_binprm *bprm)
{
struct dentry *dentry;
int rc = 0;
__le32 v1caps[XATTR_CAPS_SZ];
struct vfs_cap_data incaps;
struct inode *inode;
if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID) {
@ -232,8 +233,14 @@ 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, &v1caps,
XATTR_CAPS_SZ);
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;
}
if (rc == -ENODATA || rc == -EOPNOTSUPP) {
/* no data, that's ok */
rc = 0;
@ -242,7 +249,7 @@ static int get_file_caps(struct linux_binprm *bprm)
if (rc < 0)
goto out;
rc = cap_from_disk(v1caps, bprm, rc);
rc = cap_from_disk(&incaps, bprm, rc);
if (rc)
printk(KERN_NOTICE "%s: cap_from_disk returned %d for %s\n",
__FUNCTION__, rc, bprm->filename);