The patch titled
i386: show_registers(): try harder to print failing code
has been added to the -mm tree. Its filename is
i386-show_registers-try-harder-to-print-failing.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386: show_registers(): try harder to print failing code
From: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
show_registers() tries to dump failing code starting 43 bytes before the
offending instruction, but this address can be bad, for example in a device
driver where the failing instruction is less than 43 bytes from the start
of the driver's code. When that happens, try to dump code starting at the
failing instruction instead of printing no code at all.
Signed-off-by: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Cc: Keith Owens <kaos@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/traps.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff -puN arch/i386/kernel/traps.c~i386-show_registers-try-harder-to-print-failing arch/i386/kernel/traps.c
--- a/arch/i386/kernel/traps.c~i386-show_registers-try-harder-to-print-failing
+++ a/arch/i386/kernel/traps.c
@@ -318,6 +318,8 @@ void show_registers(struct pt_regs *regs
*/
if (in_kernel) {
u8 __user *eip;
+ int code_bytes = 64;
+ unsigned char c;
printk("\n" KERN_EMERG "Stack: ");
show_stack_log_lvl(NULL, regs, (unsigned long *)esp, KERN_EMERG);
@@ -325,9 +327,12 @@ void show_registers(struct pt_regs *regs
printk(KERN_EMERG "Code: ");
eip = (u8 __user *)regs->eip - 43;
- for (i = 0; i < 64; i++, eip++) {
- unsigned char c;
-
+ if (eip < (u8 __user *)PAGE_OFFSET || __get_user(c, eip)) {
+ /* try starting at EIP */
+ eip = (u8 __user *)regs->eip;
+ code_bytes = 32;
+ }
+ for (i = 0; i < code_bytes; i++, eip++) {
if (eip < (u8 __user *)PAGE_OFFSET || __get_user(c, eip)) {
printk(" Bad EIP value.");
break;
_
Patches currently in -mm which might be from 76306.1226@xxxxxxxxxxxxxx are
ieee80211-tkip-requires-crc32.patch
i386-print-stack-size-in-oops-messages.patch
sleazy-fpu-feature-i386-support.patch
i386-early-fault-handler.patch
i386-fix-recursive-faults-during-oops-when-current.patch
i386-show_registers-try-harder-to-print-failing.patch
-
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