From: Serge E. Hallyn <[email protected]>
Subject: [PATCH 1/2] file capabilities: don't do file caps if MNT_NOSUID
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 <[email protected]>
---
security/commoncap.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/security/commoncap.c b/security/commoncap.c
index ce91d9f..fde9695 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -23,6 +23,7 @@ #include <linux/netlink.h>
#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) {
--
1.4.1
-
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