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Message-Id: <20141028033523.590411234@linuxfoundation.org> Date: Tue, 28 Oct 2014 11:36:02 +0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Andy Lutomirski <luto@...capital.net> Subject: [PATCH 3.10 04/43] fs: Add a missing permission check to do_umount 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andy Lutomirski <luto@...capital.net> commit a1480dcc3c706e309a88884723446f2e84fedd5b upstream. Accessing do_remount_sb should require global CAP_SYS_ADMIN, but only one of the two call sites was appropriately protected. Fixes CVE-2014-7975. Signed-off-by: Andy Lutomirski <luto@...capital.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- fs/namespace.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1274,6 +1274,8 @@ static int do_umount(struct mount *mnt, * Special case for "unmounting" root ... * we just try to remount it readonly. */ + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; down_write(&sb->s_umount); if (!(sb->s_flags & MS_RDONLY)) retval = do_remount_sb(sb, MS_RDONLY, NULL, 0); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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