revert "capabilities: clean up file capability reading"
Revertb68680e473
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), whereasb68680e473
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>
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@ -56,8 +56,10 @@ typedef struct __user_cap_data_struct {
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struct vfs_cap_data {
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__u32 magic_etc; /* Little endian */
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__u32 permitted; /* Little endian */
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__u32 inheritable; /* Little endian */
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struct {
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__u32 permitted; /* Little endian */
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__u32 inheritable; /* Little endian */
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} data[1];
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};
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#ifdef __KERNEL__
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@ -197,8 +197,7 @@ int cap_inode_killpriv(struct dentry *dentry)
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return inode->i_op->removexattr(dentry, XATTR_NAME_CAPS);
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}
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static inline int cap_from_disk(struct vfs_cap_data *caps,
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struct linux_binprm *bprm,
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static inline int cap_from_disk(__le32 *caps, struct linux_binprm *bprm,
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int size)
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{
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__u32 magic_etc;
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@ -206,7 +205,7 @@ static inline int cap_from_disk(struct vfs_cap_data *caps,
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if (size != XATTR_CAPS_SZ)
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return -EINVAL;
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magic_etc = le32_to_cpu(caps->magic_etc);
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magic_etc = le32_to_cpu(caps[0]);
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switch ((magic_etc & VFS_CAP_REVISION_MASK)) {
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case VFS_CAP_REVISION:
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@ -214,8 +213,8 @@ static inline int cap_from_disk(struct vfs_cap_data *caps,
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bprm->cap_effective = true;
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else
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bprm->cap_effective = false;
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bprm->cap_permitted = to_cap_t(le32_to_cpu(caps->permitted));
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bprm->cap_inheritable = to_cap_t(le32_to_cpu(caps->inheritable));
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bprm->cap_permitted = to_cap_t(le32_to_cpu(caps[1]));
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bprm->cap_inheritable = to_cap_t(le32_to_cpu(caps[2]));
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return 0;
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default:
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return -EINVAL;
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@ -227,7 +226,7 @@ static int get_file_caps(struct linux_binprm *bprm)
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{
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struct dentry *dentry;
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int rc = 0;
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struct vfs_cap_data incaps;
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__le32 v1caps[XATTR_CAPS_SZ];
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struct inode *inode;
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if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID) {
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@ -240,14 +239,8 @@ static int get_file_caps(struct linux_binprm *bprm)
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if (!inode->i_op || !inode->i_op->getxattr)
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goto out;
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rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, NULL, 0);
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if (rc > 0) {
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if (rc == XATTR_CAPS_SZ)
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rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS,
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&incaps, XATTR_CAPS_SZ);
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else
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rc = -EINVAL;
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}
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rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, &v1caps,
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XATTR_CAPS_SZ);
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if (rc == -ENODATA || rc == -EOPNOTSUPP) {
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/* no data, that's ok */
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rc = 0;
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@ -256,7 +249,7 @@ static int get_file_caps(struct linux_binprm *bprm)
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if (rc < 0)
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goto out;
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rc = cap_from_disk(&incaps, bprm, rc);
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rc = cap_from_disk(v1caps, bprm, rc);
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if (rc)
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printk(KERN_NOTICE "%s: cap_from_disk returned %d for %s\n",
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__FUNCTION__, rc, bprm->filename);
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