[tip: x86/core] x86/dumpstack: Fix misleading instruction pointer error message

[tip-bot2 for Mark Mossberg]

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     238c91115cd05c71447ea071624a4c9fe661f970
Gitweb:        https://git.kernel.org/tip/238c91115cd05c71447ea071624a4c9fe661f970
Author:        Mark Mossberg <mark.mossberg@xxxxxxxxx>
AuthorDate:    Fri, 02 Oct 2020 04:29:16 
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Fri, 02 Oct 2020 11:33:55 +02:00

x86/dumpstack: Fix misleading instruction pointer error message

Printing "Bad RIP value" if copy_code() fails can be misleading for
userspace pointers, since copy_code() can fail if the instruction
pointer is valid but the code is paged out. This is because copy_code()
calls copy_from_user_nmi() for userspace pointers, which disables page
fault handling.

This is reproducible in OOM situations, where it's plausible that the
code may be reclaimed in the time between entry into the kernel and when
this message is printed. This leaves a misleading log in dmesg that
suggests instruction pointer corruption has occurred, which may alarm
users.

Change the message to state the error condition more precisely.

 [ bp: Massage a bit. ]

Signed-off-by: Mark Mossberg <mark.mossberg@xxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lkml.kernel.org/r/20201002042915.403558-1-mark.mossberg@xxxxxxxxx
---
 arch/x86/kernel/dumpstack.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 48ce445..ea8d51e 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -115,7 +115,8 @@ void show_opcodes(struct pt_regs *regs, const char *loglvl)
 	unsigned long prologue = regs->ip - PROLOGUE_SIZE;
 
 	if (copy_code(regs, opcodes, prologue, sizeof(opcodes))) {
-		printk("%sCode: Bad RIP value.\n", loglvl);
+		printk("%sCode: Unable to access opcode bytes at RIP 0x%lx.\n",
+		       loglvl, prologue);
 	} else {
 		printk("%sCode: %" __stringify(PROLOGUE_SIZE) "ph <%02x> %"
 		       __stringify(EPILOGUE_SIZE) "ph\n", loglvl, opcodes,