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Re: [Qemu-devel] [PATCH 11/29] 9pfs: local: lremovexattr: don't follow s
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH 11/29] 9pfs: local: lremovexattr: don't follow symlinks |
Date: |
Thu, 23 Feb 2017 14:09:02 +0000 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Mon, Feb 20, 2017 at 03:40:45PM +0100, Greg Kurz wrote:
> The local_lremovexattr() callback is vulnerable to symlink attacks because
> it calls lremovexattr() which follows symbolic links in all path elements but
> the rightmost one.
>
> This patch converts local_lremovexattr() to rely on opendir_nofollow() and
> fremovexattrat_nofollow() instead.
>
> This partly fixes CVE-2016-9602.
>
> Signed-off-by: Greg Kurz <address@hidden>
> ---
> hw/9pfs/9p-posix-acl.c | 10 ++--------
> hw/9pfs/9p-xattr-user.c | 8 +-------
> hw/9pfs/9p-xattr.c | 8 +-------
> 3 files changed, 4 insertions(+), 22 deletions(-)
Reviewed-by: Stefan Hajnoczi <address@hidden>
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[Qemu-devel] [PATCH 08/29] 9pfs: local: lgetxattr: don't follow symlinks, Greg Kurz, 2017/02/20
[Qemu-devel] [PATCH 09/29] 9pfs: local: llistxattr: don't follow symlinks, Greg Kurz, 2017/02/20
[Qemu-devel] [PATCH 10/29] 9pfs: local: lsetxattr: don't follow symlinks, Greg Kurz, 2017/02/20
[Qemu-devel] [PATCH 11/29] 9pfs: local: lremovexattr: don't follow symlinks, Greg Kurz, 2017/02/20
[Qemu-devel] [PATCH 12/29] 9pfs: local: unlinkat: don't follow symlinks, Greg Kurz, 2017/02/20
[Qemu-devel] [PATCH 13/29] 9pfs: local: remove: don't follow symlinks, Greg Kurz, 2017/02/20
[Qemu-devel] [PATCH 14/29] 9pfs: local: utimensat: don't follow symlinks, Greg Kurz, 2017/02/20
[Qemu-devel] [PATCH 15/29] 9pfs: local: statfs: don't follow symlinks, Greg Kurz, 2017/02/20