hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

fs: Add a missing permission check to do_umount 

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@amacapital.net>
This commit is contained in:
Andy Lutomirski 2014-10-08 12:32:47 -07:00
parent bfe01a5ba2
commit a1480dcc3c
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/namespace.c
View File

@ -1356,6 +1356,8 @@ static int do_umount(struct mount *mnt, int flags)
* Special case for "unmounting" root ... * Special case for "unmounting" root ...
* we just try to remount it readonly. * we just try to remount it readonly.
*/ */
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
down_write(&sb->s_umount); down_write(&sb->s_umount);
if (!(sb->s_flags & MS_RDONLY)) if (!(sb->s_flags & MS_RDONLY))
retval = do_remount_sb(sb, MS_RDONLY, NULL, 0); retval = do_remount_sb(sb, MS_RDONLY, NULL, 0);