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panic: Introduce warn_limit 

JIRA: https://issues.redhat.com/browse/RHEL-27739

This patch is a backport of the following upstream commit:
commit 9fc9e278a5c0b708eeffaf47d6eb0c82aa74ed78
Author: Kees Cook <keescook@chromium.org>
Date:   Thu Nov 17 15:43:25 2022 -0800

    panic: Introduce warn_limit

    Like oops_limit, add warn_limit for limiting the number of warnings when
    panic_on_warn is not set.

    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: Petr Mladek <pmladek@suse.com>
    Cc: tangmeng <tangmeng@uniontech.com>
    Cc: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
    Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
    Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
    Cc: linux-doc@vger.kernel.org
    Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
    Signed-off-by: Kees Cook <keescook@chromium.org>
    Link: https://lore.kernel.org/r/20221117234328.594699-5-keescook@chromium.org

Signed-off-by: Audra Mitchell <audra@redhat.com>
This commit is contained in:
Audra Mitchell 2024-03-05 20:08:10 -05:00
parent 21ede44837
commit dd703babed
2 changed files with 24 additions and 0 deletions
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10
Documentation/admin-guide/sysctl/kernel.rst
View File

@ -1587,6 +1587,16 @@ entry will default to 2 instead of 0.
2 Unprivileged calls to ``bpf()`` are disabled
= =============================================================
warn_limit
==========
Number of kernel warnings after which the kernel should panic when
``panic_on_warn`` is not set. Setting this to 0 disables checking
the warning count. Setting this to 1 has the same effect as setting
``panic_on_warn=1``. The default value is 0.
watchdog
========

14
kernel/panic.c
View File

@ -58,6 +58,7 @@ bool crash_kexec_post_notifiers;
int panic_on_warn __read_mostly;
unsigned long panic_on_taint;
bool panic_on_taint_nousertaint = false;
static unsigned int warn_limit __read_mostly;
int panic_timeout = CONFIG_PANIC_TIMEOUT;
EXPORT_SYMBOL_GPL(panic_timeout);
@ -87,6 +88,13 @@ static struct ctl_table kern_panic_table[] = {
.extra2 = SYSCTL_ONE,
},
#endif
{
.procname = "warn_limit",
.data = &warn_limit,
.maxlen = sizeof(warn_limit),
.mode = 0644,
.proc_handler = proc_douintvec,
},
{ }
};
@ -196,8 +204,14 @@ static void panic_print_sys_info(void)
void check_panic_on_warn(const char *origin)
{
static atomic_t warn_count = ATOMIC_INIT(0);
if (panic_on_warn)
panic("%s: panic_on_warn set ...\n", origin);
if (atomic_inc_return(&warn_count) >= READ_ONCE(warn_limit) && warn_limit)
panic("%s: system warned too often (kernel.warn_limit is %d)",
origin, warn_limit);
}
/**