Re: [PATCH 5.4 00/17] Backport oops_limit to 5.4

[Sasha Levin]

On Thu, Feb 02, 2023 at 12:16:52PM -0500, Sasha Levin wrote:
> On Wed, Feb 01, 2023 at 08:42:38PM -0800, Eric Biggers wrote:
> > This series backports the patchset
> > "exit: Put an upper limit on how often we can oops"
> > (https://lore.kernel.org/linux-mm/20221117233838.give.484-kees@xxxxxxxxxx/T/#u)
> > to 5.4, as recommended at
> > https://googleprojectzero.blogspot.com/2023/01/exploiting-null-dereferences-in-linux.html
> > This follows the backports to 5.10 and 5.15 which already released.
> >
> > This required backporting various prerequisite patches.
> >
> > I've tested that oops_limit and warn_limit work correctly on x86_64.
>
> Queued up all 3 backports, thanks!

... and proceeded to drop the 4.19 and 4.14 backports which fail to
build:

mm/kasan/report.c: In function 'kasan_end_report':
mm/kasan/report.c:175:16: error: 'KASAN_BIT_MULTI_SHOT' undeclared (first use in this function)
  175 |  if (!test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags))

--
Thanks,
Sasha