Commit b68680e4 authored by Serge E. Hallyn's avatar Serge E. Hallyn Committed by Linus Torvalds

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: default avatarSerge E. Hallyn <serue@us.ibm.com>
Cc: Andrew Morgan <morgan@kernel.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b9049e23
...@@ -56,10 +56,8 @@ typedef struct __user_cap_data_struct { ...@@ -56,10 +56,8 @@ typedef struct __user_cap_data_struct {
struct vfs_cap_data { struct vfs_cap_data {
__u32 magic_etc; /* Little endian */ __u32 magic_etc; /* Little endian */
struct {
__u32 permitted; /* Little endian */ __u32 permitted; /* Little endian */
__u32 inheritable; /* Little endian */ __u32 inheritable; /* Little endian */
} data[1];
}; };
#ifdef __KERNEL__ #ifdef __KERNEL__
......
...@@ -190,7 +190,8 @@ int cap_inode_killpriv(struct dentry *dentry) ...@@ -190,7 +190,8 @@ int cap_inode_killpriv(struct dentry *dentry)
return inode->i_op->removexattr(dentry, XATTR_NAME_CAPS); 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) int size)
{ {
__u32 magic_etc; __u32 magic_etc;
...@@ -198,7 +199,7 @@ static inline int cap_from_disk(__le32 *caps, struct linux_binprm *bprm, ...@@ -198,7 +199,7 @@ static inline int cap_from_disk(__le32 *caps, struct linux_binprm *bprm,
if (size != XATTR_CAPS_SZ) if (size != XATTR_CAPS_SZ)
return -EINVAL; return -EINVAL;
magic_etc = le32_to_cpu(caps[0]); 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: case VFS_CAP_REVISION:
...@@ -206,8 +207,8 @@ static inline int cap_from_disk(__le32 *caps, struct linux_binprm *bprm, ...@@ -206,8 +207,8 @@ static inline int cap_from_disk(__le32 *caps, struct linux_binprm *bprm,
bprm->cap_effective = true; bprm->cap_effective = true;
else else
bprm->cap_effective = false; bprm->cap_effective = false;
bprm->cap_permitted = to_cap_t( le32_to_cpu(caps[1]) ); bprm->cap_permitted = to_cap_t(le32_to_cpu(caps->permitted));
bprm->cap_inheritable = to_cap_t( le32_to_cpu(caps[2]) ); bprm->cap_inheritable = to_cap_t(le32_to_cpu(caps->inheritable));
return 0; return 0;
default: default:
return -EINVAL; return -EINVAL;
...@@ -219,7 +220,7 @@ static int get_file_caps(struct linux_binprm *bprm) ...@@ -219,7 +220,7 @@ static int get_file_caps(struct linux_binprm *bprm)
{ {
struct dentry *dentry; struct dentry *dentry;
int rc = 0; int rc = 0;
__le32 v1caps[XATTR_CAPS_SZ]; struct vfs_cap_data incaps;
struct inode *inode; struct inode *inode;
if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID) { if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID) {
...@@ -232,8 +233,14 @@ static int get_file_caps(struct linux_binprm *bprm) ...@@ -232,8 +233,14 @@ static int get_file_caps(struct linux_binprm *bprm)
if (!inode->i_op || !inode->i_op->getxattr) if (!inode->i_op || !inode->i_op->getxattr)
goto out; goto out;
rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, &v1caps, rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, NULL, 0);
XATTR_CAPS_SZ); 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) { if (rc == -ENODATA || rc == -EOPNOTSUPP) {
/* no data, that's ok */ /* no data, that's ok */
rc = 0; rc = 0;
...@@ -242,7 +249,7 @@ static int get_file_caps(struct linux_binprm *bprm) ...@@ -242,7 +249,7 @@ static int get_file_caps(struct linux_binprm *bprm)
if (rc < 0) if (rc < 0)
goto out; goto out;
rc = cap_from_disk(v1caps, bprm, rc); rc = cap_from_disk(&incaps, bprm, rc);
if (rc) if (rc)
printk(KERN_NOTICE "%s: cap_from_disk returned %d for %s\n", printk(KERN_NOTICE "%s: cap_from_disk returned %d for %s\n",
__FUNCTION__, rc, bprm->filename); __FUNCTION__, rc, bprm->filename);
......
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