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exit: Allow oops_limit to be disabled

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commit de92f65719cd672f4b48397540b9f9eff67eca40 upstream.

In preparation for keeping oops_limit logic in sync with warn_limit,
have oops_limit == 0 disable checking the Oops counter.

Cc: Jann Horn <jannh@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kees Cook 2023-02-01 20:42:50 -08:00 committed by Greg Kroah-Hartman
parent 5a3482f2c1
commit 7020a9234e
2 changed files with 4 additions and 3 deletions
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5
Documentation/admin-guide/sysctl/kernel.rst
View File

@ -561,8 +561,9 @@ oops_limit
==========
Number of kernel oopses after which the kernel should panic when
``panic_on_oops`` is not set. Setting this to 0 or 1 has the same effect
as setting ``panic_on_oops=1``.
``panic_on_oops`` is not set. Setting this to 0 disables checking
the count. Setting this to 1 has the same effect as setting
``panic_on_oops=1``. The default value is 10000.
osrelease, ostype & version:

2
kernel/exit.c
View File

@ -928,7 +928,7 @@ void __noreturn make_task_dead(int signr)
* To make sure this can't happen, place an upper bound on how often the
* kernel may oops without panic().
*/
if (atomic_inc_return(&oops_count) >= READ_ONCE(oops_limit))
if (atomic_inc_return(&oops_count) >= READ_ONCE(oops_limit) && oops_limit)
panic("Oopsed too often (kernel.oops_limit is %d)", oops_limit);
do_exit(signr);