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Date: Fri, 07 Feb 2020 14:44:46 +0000 From: Thomas Gleixner <tglx@...utronix.de> To: Eric Dumazet <edumazet@...gle.com>, Ingo Molnar <mingo@...nel.org> Cc: linux-kernel <linux-kernel@...r.kernel.org>, Eric Dumazet <edumazet@...gle.com>, Eric Dumazet <eric.dumazet@...il.com>, Andy Lutomirski <luto@...nel.org> Subject: Re: [PATCH] x86/traps: do not hash pointers in handle_stack_overflow() Eric Dumazet <edumazet@...gle.com> writes: > Mangling stack pointers in handle_stack_overflow() is moot, > as registers (including RSP/RBP) are clear anyway. > > BUG: stack guard page was hit at 0000000063381e80 (stack is > 000000008edc5696..0000000012256c50) To illustrate your argument above it would be useful to provide the post patch output as well. > kernel stack overflow (double-fault): 0000 [#1] PREEMPT SMP KASAN > ... > RSP: 0018:ffffc90002c1ffc0 EFLAGS: 00010802 > RAX: 1ffff11004a0094c RBX: ffff888025004180 RCX: c9d82d1007bb146c > RDX: dffffc0000000000 RSI: ffff888025004a40 RDI: ffff888025004180 > RBP: ffffc90002c201c0 R08: dffffc0000000000 R09: fffffbfff1405915 > R10: fffffbfff1405915 R11: 0000000000000000 R12: ffff888025004a60 > R13: ffff888025004a10 R14: c9d82d1007bb146c R15: ffff888025004180 > ... > > Signed-off-by: Eric Dumazet <edumazet@...gle.com> > Cc: Andy Lutomirski <luto@...nel.org> > --- > arch/x86/kernel/traps.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c > index 6ef00eb6fbb925e86109f86845e2b3ccef4023ec..44873df292bd3f9f77bb721c53cb8a1c40994cca 100644 > --- a/arch/x86/kernel/traps.c > +++ b/arch/x86/kernel/traps.c > @@ -296,7 +296,7 @@ __visible void __noreturn handle_stack_overflow(const char *message, > struct pt_regs *regs, > unsigned long fault_address) > { > - printk(KERN_EMERG "BUG: stack guard page was hit at %p (stack is %p..%p)\n", > + printk(KERN_EMERG "BUG: stack guard page was hit at %px (stack > is %px..%px)\n", While touching this, can you please switch it to pr_emerg() ? Thanks, tglx
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