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| author |   Dmitry Vyukov <dvyukov@google.com> | 2018-06-27 11:07:15 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-06-27 14:08:11 +0200 |
| commit | d79d0d8ad0cb3d782b41631dfeac8eb05e414bcd (patch) | |
| tree | 589ebe684340e9b50da62f9f81094c72244d3f32 /arch | |
| parent | x86/mm: Drop unneeded __always_inline for p4d page table helpers (diff) | |
| download | linux-dev-d79d0d8ad0cb3d782b41631dfeac8eb05e414bcd.tar.xz linux-dev-d79d0d8ad0cb3d782b41631dfeac8eb05e414bcd.zip | |
x86/mm: Clean up the printk()s in show_fault_oops()
- Remove 'nx_warning' and 'smep_warning', which are just pointless obfuscation.
- Also convert to pr_crit().
Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180627090715.28076-1-dvyukov@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/mm/fault.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index ee85766e6329..2aafa6ab6103 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -641,11 +641,6 @@ static int is_f00f_bug(struct pt_regs *regs, unsigned long address) return 0; } -static const char nx_warning[] = KERN_CRIT -"kernel tried to execute NX-protected page - exploit attempt? (uid: %d)\n"; -static const char smep_warning[] = KERN_CRIT -"unable to execute userspace code (SMEP?) (uid: %d)\n"; - static void show_fault_oops(struct pt_regs *regs, unsigned long error_code, unsigned long address) @@ -664,11 +659,13 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code, pte = lookup_address_in_pgd(pgd, address, &level); if (pte && pte_present(*pte) && !pte_exec(*pte)) - printk(nx_warning, from_kuid(&init_user_ns, current_uid())); + pr_crit("kernel tried to execute NX-protected page - exploit attempt? (uid: %d)\n", + from_kuid(&init_user_ns, current_uid())); if (pte && pte_present(*pte) && pte_exec(*pte) && (pgd_flags(*pgd) & _PAGE_USER) && (__read_cr4() & X86_CR4_SMEP)) - printk(smep_warning, from_kuid(&init_user_ns, current_uid())); + pr_crit("unable to execute userspace code (SMEP?) (uid: %d)\n", + from_kuid(&init_user_ns, current_uid())); } pr_alert("BUG: unable to handle kernel %s at %px\n", |