This is a note to let you know that I've just added the patch titled
exit: Allow oops_limit to be disabled
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
exit-allow-oops_limit-to-be-disabled.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From stable-owner@xxxxxxxxxxxxxxx Fri Feb 3 01:29:01 2023
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Thu, 2 Feb 2023 16:27:12 -0800
Subject: exit: Allow oops_limit to be disabled
To: stable@xxxxxxxxxxxxxxx
Cc: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, SeongJae Park <sj@xxxxxxxxxx>, Seth Jenkins <sethjenkins@xxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, "Eric W . Biederman" <ebiederm@xxxxxxxxxxxx>, linux-hardening@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Jonathan Corbet <corbet@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>, "Jason A. Donenfeld" <Jason@xxxxxxxxx>, Eric Biggers <ebiggers@xxxxxxxxxx>, Huang Ying <ying.huang@xxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx
Message-ID: <20230203002717.49198-11-ebiggers@xxxxxxxxxx>
From: Kees Cook <keescook@xxxxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Cc: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
Documentation/sysctl/kernel.txt | 5 +++--
kernel/exit.c | 2 +-
2 files changed, 4 insertions(+), 3 deletions(-)
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -559,8 +559,9 @@ scanned for a given scan.
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.
==============================================================
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -986,7 +986,7 @@ 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);
Patches currently in stable-queue which might be from stable-owner@xxxxxxxxxxxxxxx are
queue-4.19/panic-unset-panic_on_warn-inside-panic.patch
queue-4.19/objtool-add-a-missing-comma-to-avoid-string-concatenation.patch
queue-4.19/hexagon-fix-function-name-in-die.patch
queue-4.19/exit-add-and-use-make_task_dead.patch
queue-4.19/h8300-fix-build-errors-from-do_exit-to-make_task_dead-transition.patch
queue-4.19/panic-consolidate-open-coded-panic_on_warn-checks.patch
queue-4.19/exit-put-an-upper-limit-on-how-often-we-can-oops.patch
queue-4.19/panic-introduce-warn_limit.patch
queue-4.19/exit-allow-oops_limit-to-be-disabled.patch
queue-4.19/ia64-make-ia64_mca_recovery-bool-instead-of-tristate.patch
queue-4.19/exit-use-read_once-for-all-oops-warn-limit-reads.patch
queue-4.19/exit-expose-oops_count-to-sysfs.patch
queue-4.19/panic-expose-warn_count-to-sysfs.patch
queue-4.19/docs-fix-path-paste-o-for-sys-kernel-warn_count.patch
queue-4.19/sysctl-add-a-new-register_sysctl_init-interface.patch
