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livepatch: kernel: add TAINT_LIVEPATCH

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This adds a new taint flag to indicate when the kernel or a kernel
module has been live patched.  This will provide a clean indication in
bug reports that live patching was used.

Additionally, if the crash occurs in a live patched function, the live
patch module will appear beside the patched function in the backtrace.

Signed-off-by: Seth Jennings <sjenning@redhat.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Seth Jennings 2014-12-16 11:58:18 -06:00 committed by Jiri Kosina
parent 97bf6af1f9
commit c5f4546593
4 changed files with 6 additions and 0 deletions
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2
Documentation/oops-tracing.txt
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@ -270,6 +270,8 @@ characters, each representing a particular tainted value.
15: 'L' if a soft lockup has previously occurred on the system. 15: 'L' if a soft lockup has previously occurred on the system.
16: 'K' if the kernel has been live patched.
The primary reason for the 'Tainted: ' string is to tell kernel The primary reason for the 'Tainted: ' string is to tell kernel
debuggers if this is a clean kernel or if anything unusual has debuggers if this is a clean kernel or if anything unusual has
occurred. Tainting is permanent: even if an offending module is occurred. Tainting is permanent: even if an offending module is

1
Documentation/sysctl/kernel.txt
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@ -843,6 +843,7 @@ can be ORed together:
8192 - An unsigned module has been loaded in a kernel supporting module 8192 - An unsigned module has been loaded in a kernel supporting module
signature. signature.
16384 - A soft lockup has previously occurred on the system. 16384 - A soft lockup has previously occurred on the system.
32768 - The kernel has been live patched.
============================================================== ==============================================================

1
include/linux/kernel.h
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@ -471,6 +471,7 @@ extern enum system_states {
#define TAINT_OOT_MODULE 12 #define TAINT_OOT_MODULE 12
#define TAINT_UNSIGNED_MODULE 13 #define TAINT_UNSIGNED_MODULE 13
#define TAINT_SOFTLOCKUP 14 #define TAINT_SOFTLOCKUP 14
#define TAINT_LIVEPATCH 15
extern const char hex_asc[]; extern const char hex_asc[];
#define hex_asc_lo(x) hex_asc[((x) & 0x0f)] #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]

2
kernel/panic.c
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@ -226,6 +226,7 @@ static const struct tnt tnts[] = {
{ TAINT_OOT_MODULE, 'O', ' ' }, { TAINT_OOT_MODULE, 'O', ' ' },
{ TAINT_UNSIGNED_MODULE, 'E', ' ' }, { TAINT_UNSIGNED_MODULE, 'E', ' ' },
{ TAINT_SOFTLOCKUP, 'L', ' ' }, { TAINT_SOFTLOCKUP, 'L', ' ' },
{ TAINT_LIVEPATCH, 'K', ' ' },
}; };
/** /**
@ -246,6 +247,7 @@ static const struct tnt tnts[] = {
* 'O' - Out-of-tree module has been loaded. * 'O' - Out-of-tree module has been loaded.
* 'E' - Unsigned module has been loaded. * 'E' - Unsigned module has been loaded.
* 'L' - A soft lockup has previously occurred. * 'L' - A soft lockup has previously occurred.
* 'K' - Kernel has been live patched.
* *
* The string is overwritten by the next call to print_tainted(). * The string is overwritten by the next call to print_tainted().
*/ */