diff options
| author | Andy Lutomirski <luto@kernel.org> | 2019-06-27 06:45:04 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-06-28 00:04:39 +0200 |
| commit | 918ce325098a4eef99daad7b6796da33cebaf03a (patch) | |
| tree | 350e3c5a1bae0686cb0050a466b85917792e4b7f /arch/x86/include/asm/vsyscall.h | |
| parent | x86/vsyscall: Add a new vsyscall=xonly mode (diff) | |
| download | linux-918ce325098a4eef99daad7b6796da33cebaf03a.tar.xz linux-918ce325098a4eef99daad7b6796da33cebaf03a.zip | |
x86/vsyscall: Show something useful on a read fault
Just segfaulting the application when it tries to read the vsyscall page in
xonly mode is not helpful for those who need to debug it.
Emit a hint.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Jann Horn <jannh@google.com>
Link: https://lkml.kernel.org/r/8016afffe0eab497be32017ad7f6f7030dc3ba66.1561610354.git.luto@kernel.org
Diffstat (limited to 'arch/x86/include/asm/vsyscall.h')
| -rw-r--r-- | arch/x86/include/asm/vsyscall.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/include/asm/vsyscall.h b/arch/x86/include/asm/vsyscall.h index b986b2ca688a..ab60a71a8dcb 100644 --- a/arch/x86/include/asm/vsyscall.h +++ b/arch/x86/include/asm/vsyscall.h @@ -13,10 +13,12 @@ extern void set_vsyscall_pgtable_user_bits(pgd_t *root); * Called on instruction fetch fault in vsyscall page. * Returns true if handled. */ -extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address); +extern bool emulate_vsyscall(unsigned long error_code, + struct pt_regs *regs, unsigned long address); #else static inline void map_vsyscall(void) {} -static inline bool emulate_vsyscall(struct pt_regs *regs, unsigned long address) +static inline bool emulate_vsyscall(unsigned long error_code, + struct pt_regs *regs, unsigned long address) { return false; } |