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kprobes/arm64: Blacklist sdei watchdog callback functions 

commit bdda54cc39843589ee91a0176ca9a94adf307763 openeuler.

Functions called in sdei_handler are not allowed to be kprobed, so
marked them as NOKPROBE_SYMBOL. There are so many functions in
'watchdog_check_timestamp()'. Luckily, we don't need
'CONFIG_HARDLOCKUP_CHECK_TIMESTAMP' now. So just make
CONFIG_SDEI_WATCHDOG depends on !CONFIG_HARDLOCKUP_CHECK_TIMESTAMP
in case someone add 'CONFIG_HARDLOCKUP_CHECK_TIMESTAMP' in the future.

Signed-off-by: huwentao <huwentao19@h-partners.com>
This commit is contained in:
Xiongfeng Wang 2021-02-20 11:01:02 +08:00 committed by lcy
parent 4108f89bf6
commit 1656fd96c3
4 changed files with 7 additions and 1 deletions
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2
arch/arm64/kernel/watchdog_sdei.c
View File

@ -14,6 +14,7 @@
#include <asm/sdei.h>
#include <asm/virt.h>
#include <linux/arm_sdei.h>
#include <linux/kprobes.h>
#include <linux/nmi.h>
/* We use the secure physical timer as SDEI NMI watchdog timer */
@ -66,6 +67,7 @@ static int sdei_watchdog_callback(u32 event,
return 0;
}
NOKPROBE_SYMBOL(sdei_watchdog_callback);
static void sdei_nmi_watchdog_bind(void *data)
{

2
kernel/watchdog.c
View File

@ -16,6 +16,7 @@
#include <linux/cpu.h>
#include <linux/nmi.h>
#include <linux/init.h>
#include <linux/kprobes.h>
#include <linux/module.h>
#include <linux/sysctl.h>
#include <linux/tick.h>
@ -333,6 +334,7 @@ bool is_hardlockup(void)
__this_cpu_write(hrtimer_interrupts_saved, hrint);
return false;
}
NOKPROBE_SYMBOL(is_hardlockup);
static void watchdog_interrupt_count(void)
{

2
kernel/watchdog_hld.c
View File

@ -14,6 +14,7 @@
#include <linux/nmi.h>
#include <linux/atomic.h>
#include <linux/kprobes.h>
#include <linux/module.h>
#include <linux/sched/debug.h>
@ -155,6 +156,7 @@ void watchdog_hardlockup_check(struct pt_regs *regs)
__this_cpu_write(hard_watchdog_warn, false);
return;
}
NOKPROBE_SYMBOL(watchdog_hardlockup_check);
#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);

2
lib/Kconfig.debug
View File

@ -855,7 +855,7 @@ config HARDLOCKUP_DETECTOR_PERF
config SDEI_WATCHDOG
bool "SDEI NMI Watchdog support"
depends on ARM_SDE_INTERFACE
depends on ARM_SDE_INTERFACE && !HARDLOCKUP_CHECK_TIMESTAMP
select HAVE_HARDLOCKUP_DETECTOR_ARCH
select HARDLOCKUP_DETECTOR