The patch titled
file capabilities: don't do file caps if MNT_NOSUID
has been added to the -mm tree. Its filename is
file-capabilities-dont-do-file-caps-if-mnt_nosuid.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: file capabilities: don't do file caps if MNT_NOSUID
From: Serge E. Hallyn <serue@xxxxxxxxxx>
A file system mounted NOSUID is likely a removable filesystem. Allowing
file capabilities from such an fs is an easy attack vector, so don't honor
file capabilities for a NOSUID filesystem.
Signed-off-by: Serge E. Hallyn <serue@xxxxxxxxxx>
Cc: Stephen Smalley <sds@xxxxxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
security/commoncap.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN security/commoncap.c~file-capabilities-dont-do-file-caps-if-mnt_nosuid security/commoncap.c
--- a/security/commoncap.c~file-capabilities-dont-do-file-caps-if-mnt_nosuid
+++ a/security/commoncap.c
@@ -23,6 +23,7 @@
#include <linux/ptrace.h>
#include <linux/xattr.h>
#include <linux/hugetlb.h>
+#include <linux/mount.h>
int cap_netlink_send(struct sock *sk, struct sk_buff *skb)
{
@@ -152,6 +153,9 @@ static int set_file_caps(struct linux_bi
struct inode *inode;
int err;
+ if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)
+ return 0;
+
dentry = dget(bprm->file->f_dentry);
inode = dentry->d_inode;
if (!inode->i_op || !inode->i_op->getxattr) {
_
Patches currently in -mm which might be from serue@xxxxxxxxxx are
implement-file-posix-capabilities.patch
file-capabilities-dont-do-file-caps-if-mnt_nosuid.patch
-
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