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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
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@ -1509,6 +1509,16 @@ entry will default to 2 instead of 0.
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2 Unprivileged calls to ``bpf()`` are disabled
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= =============================================================
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warn_limit
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==========
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Number of kernel warnings after which the kernel should panic when
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``panic_on_warn`` is not set. Setting this to 0 disables checking
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the warning count. Setting this to 1 has the same effect as setting
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``panic_on_warn=1``. The default value is 0.
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watchdog
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========
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@ -58,6 +58,7 @@ bool crash_kexec_post_notifiers;
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int panic_on_warn __read_mostly;
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unsigned long panic_on_taint;
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bool panic_on_taint_nousertaint = false;
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static unsigned int warn_limit __read_mostly;
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int panic_timeout = CONFIG_PANIC_TIMEOUT;
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EXPORT_SYMBOL_GPL(panic_timeout);
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@ -88,6 +89,13 @@ static struct ctl_table kern_panic_table[] = {
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.extra2 = SYSCTL_ONE,
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},
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#endif
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{
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.procname = "warn_limit",
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.data = &warn_limit,
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.maxlen = sizeof(warn_limit),
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.mode = 0644,
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.proc_handler = proc_douintvec,
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},
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{ }
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};
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@ -203,8 +211,14 @@ static void panic_print_sys_info(bool console_flush)
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void check_panic_on_warn(const char *origin)
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{
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static atomic_t warn_count = ATOMIC_INIT(0);
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if (panic_on_warn)
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panic("%s: panic_on_warn set ...\n", origin);
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if (atomic_inc_return(&warn_count) >= READ_ONCE(warn_limit) && warn_limit)
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panic("%s: system warned too often (kernel.warn_limit is %d)",
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origin, warn_limit);
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}
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/**
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