From: Jiri Slaby Date: Tue, 6 Sep 2022 07:11:23 +0000 (+0200) Subject: x86/dumpstack: Don't mention RIP in "Code: " X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5258b80e60da6d8908ae2846b234ed8d9d9d4a19;p=linux.git x86/dumpstack: Don't mention RIP in "Code: " Commit 238c91115cd0 ("x86/dumpstack: Fix misleading instruction pointer error message") changed the "Code:" line in bug reports when RIP is an invalid pointer. In particular, the report currently says (for example): BUG: kernel NULL pointer dereference, address: 0000000000000000 ... RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. That Unable to access opcode bytes at RIP 0xffffffffffffffd6. is quite confusing as RIP value is 0, not -42. That -42 comes from "regs->ip - PROLOGUE_SIZE", because Code is dumped with some prologue (and epilogue). So do not mention "RIP" on this line in this context. Signed-off-by: Jiri Slaby Signed-off-by: Borislav Petkov Link: https://lore.kernel.org/r/b772c39f-c5ae-8f17-fe6e-6a2bc4d1f83b@kernel.org --- diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index afae4dd774951..b3dba35f466e2 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -128,7 +128,7 @@ void show_opcodes(struct pt_regs *regs, const char *loglvl) /* No access to the user space stack of other tasks. Ignore. */ break; default: - printk("%sCode: Unable to access opcode bytes at RIP 0x%lx.\n", + printk("%sCode: Unable to access opcode bytes at 0x%lx.\n", loglvl, prologue); break; }