[v5,13/17] arm64: __show_regs: strip PAC from lr in printk
diff mbox series

Message ID 1581931668-11559-14-git-send-email-amit.kachhap@arm.com
State New
Headers show
  • arm64: return address signing
Related show

Commit Message

Amit Kachhap Feb. 17, 2020, 9:27 a.m. UTC
lr is printed with %pS which will try to find an entry in kallsyms.
After enabling pointer authentication, this match will fail due to
PAC present in the lr.

Strip PAC from the lr to display the correct symbol name.

Suggested-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
 arch/arm64/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff mbox series

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 7db0302..cacae29 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -262,7 +262,7 @@  void __show_regs(struct pt_regs *regs)
 	if (!user_mode(regs)) {
 		printk("pc : %pS\n", (void *)regs->pc);
-		printk("lr : %pS\n", (void *)lr);
+		printk("lr : %pS\n", (void *)ptrauth_strip_insn_pac(lr));
 	} else {
 		printk("pc : %016llx\n", regs->pc);
 		printk("lr : %016llx\n", lr);