diff options
| -rw-r--r-- | arch/x86/kernel/traps.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index f5f4a76fb516..3857c0fd3306 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -205,6 +205,21 @@ static void do_error_trap(struct pt_regs *regs, long error_code, char *str, } } +/* + * Posix requires to provide the address of the faulting instruction for + * SIGILL (#UD) and SIGFPE (#DE) in the si_addr member of siginfo_t. + * + * This address is usually regs->ip, but when an uprobe moved the code out + * of line then regs->ip points to the XOL code which would confuse + * anything which analyzes the fault address vs. the unmodified binary. If + * a trap happened in XOL code then uprobe maps regs->ip back to the + * original instruction address. + */ +static __always_inline void __user *error_get_trap_addr(struct pt_regs *regs) +{ + return (void __user *)uprobe_get_trap_addr(regs); +} + #define IP ((void __user *)uprobe_get_trap_addr(regs)) #define DO_ERROR(trapnr, signr, sicode, addr, str, name) \ dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \ |