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exit: Allow oops_limit to be disabled

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commit de92f65719 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 2023-01-24 10:51:05 -08:00 • committed by Justin Hammond
parent a11a25ea0e
commit e656e4c33c
2 changed files with 4 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

5
Documentation/admin-guide/sysctl/kernel.rst
View file

@ -675,8 +675,9 @@ oops_limit
========== ==========
Number of kernel oopses after which the kernel should panic when 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 ``panic_on_oops`` is not set. Setting this to 0 disables checking
as setting ``panic_on_oops=1``. the count. Setting this to 1 has the same effect as setting
``panic_on_oops=1``. The default value is 10000.
osrelease, ostype & version osrelease, ostype & version

2
kernel/exit.c
View file

@ -941,7 +941,7 @@ void __noreturn make_task_dead(int signr)
* To make sure this can't happen, place an upper bound on how often the * To make sure this can't happen, place an upper bound on how often the
* kernel may oops without panic(). * 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); panic("Oopsed too often (kernel.oops_limit is %d)", oops_limit);
do_exit(signr); do_exit(signr);