On Thu, 5 Jul 2018 08:44:18 -0700 Kees Cook <keescook@xxxxxxxxxxxx> wrote: > On Thu, Jul 5, 2018 at 7:55 AM, <osalvador@xxxxxxxxxxxxxxxxxx> wrote: > > From: Oscar Salvador <osalvador@xxxxxxx> > > > > The current code does not make sure to page align bss before calling > > vm_brk(), and this can lead to a VM_BUG_ON() in __mm_populate() > > due to the requested lenght not being correctly aligned. > > > > Let us make sure to align it properly. > > > > Signed-off-by: Oscar Salvador <osalvador@xxxxxxx> > > Tested-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> > > Reported-by: syzbot+5dcb560fe12aa5091c06@xxxxxxxxxxxxxxxxxxxxxxxxx > > Wow. CONFIG_USELIB? I'm surprised distros are still using this. 32-bit > only, and libc5 and earlier only. Presumably doesn't happen much, but people who *are* enabling this will want the fix, so I added the cc:stable.
