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>
diff --git a/include/linux/capability.h b/include/linux/capability.h
index bb017ed..7a8d7ad 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -56,8 +56,10 @@
struct vfs_cap_data {
__u32 magic_etc; /* Little endian */
- __u32 permitted; /* Little endian */
- __u32 inheritable; /* Little endian */
+ struct {
+ __u32 permitted; /* Little endian */
+ __u32 inheritable; /* Little endian */
+ } data[1];
};
#ifdef __KERNEL__
diff --git a/security/commoncap.c b/security/commoncap.c
index ea61bc7..b06617b 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -197,8 +197,7 @@
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 @@
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 @@
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 @@
{
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 @@
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 @@
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);