Messages in this thread Patch in this message | | | From | Tiezhu Yang <> | Subject | [PATCH v2 1/2] LoongArch: Remove noreturn attribute for die() | Date | Mon, 14 Aug 2023 12:51:10 +0800 |
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If notify_die() returns NOTIFY_STOP, honor the return value from the handler chain invocation in die() as, through a debugger, the fault may have been fixed. It makes sense even if ignoring the event will make the system unstable, by allowing access through a debugger it has been compromised already anyway. So we can remove the noreturn attribute for die() to make our port consistent with x86, arm64, riscv and csky.
Commit 20c0d2d44029 ("[PATCH] i386: pass proper trap numbers to die chain handlers") may be the earliest of similar changes.
Link: https://lore.kernel.org/all/alpine.DEB.2.21.2308132148500.8596@angie.orcam.me.uk/ Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> --- arch/loongarch/kernel/traps.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c index 8fb5e7a..bbdfc5b 100644 --- a/arch/loongarch/kernel/traps.c +++ b/arch/loongarch/kernel/traps.c @@ -383,16 +383,15 @@ void show_registers(struct pt_regs *regs) static DEFINE_RAW_SPINLOCK(die_lock); -void __noreturn die(const char *str, struct pt_regs *regs) +void die(const char *str, struct pt_regs *regs) { static int die_counter; - int sig = SIGSEGV; + int ret; oops_enter(); - if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_nr, - SIGSEGV) == NOTIFY_STOP) - sig = 0; + ret = notify_die(DIE_OOPS, str, regs, 0, + current->thread.trap_nr, SIGSEGV); console_verbose(); raw_spin_lock_irq(&die_lock); @@ -414,7 +413,8 @@ void __noreturn die(const char *str, struct pt_regs *regs) if (panic_on_oops) panic("Fatal exception"); - make_task_dead(sig); + if (ret != NOTIFY_STOP) + make_task_dead(SIGSEGV); } static inline void setup_vint_size(unsigned int size) -- 2.1.0
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