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@xxxxxxxxxx>
---
Documentation/oops-tracing.txt | 2 ++
Documentation/sysctl/kernel.txt | 1 +
include/linux/kernel.h | 1 +
kernel/panic.c | 2 ++
4 files changed, 6 insertions(+)
diff --git a/Documentation/oops-tracing.txt b/Documentation/oops-tracing.txt
index beefb9f..f3ac05c 100644
--- a/Documentation/oops-tracing.txt
+++ b/Documentation/oops-tracing.txt
@@ -270,6 +270,8 @@ characters, each representing a particular tainted value.
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
debuggers if this is a clean kernel or if anything unusual has
occurred. Tainting is permanent: even if an offending module is
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index d7fc4ab..085f73b 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -831,6 +831,7 @@ can be ORed together:
8192 - An unsigned module has been loaded in a kernel supporting module
signature.
16384 - A soft lockup has previously occurred on the system.
+32768 - The kernel has been live patched.
==============================================================
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 446d76a..a6aa2df 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -473,6 +473,7 @@ extern enum system_states {
#define TAINT_OOT_MODULE 12
#define TAINT_UNSIGNED_MODULE 13
#define TAINT_SOFTLOCKUP 14
+#define TAINT_LIVEPATCH 15
extern const char hex_asc[];
#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
diff --git a/kernel/panic.c b/kernel/panic.c
index d09dc5c..46bca3d 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -225,6 +225,7 @@ static const struct tnt tnts[] = {
{ TAINT_OOT_MODULE, 'O', ' ' },
{ TAINT_UNSIGNED_MODULE, 'E', ' ' },
{ TAINT_SOFTLOCKUP, 'L', ' ' },
+ { TAINT_LIVEPATCH, 'K', ' ' },
};
/**
@@ -244,6 +245,7 @@ static const struct tnt tnts[] = {
* 'I' - Working around severe firmware bug.
* 'O' - Out-of-tree module has been loaded.
* 'E' - Unsigned module has been loaded.
+ * 'K' - Kernel has been live patched.
*
* The string is overwritten by the next call to print_tainted().
*/
--
1.9.3
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