The patch titled
Subject: error-injection: add prompt for function error injection
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
error-injection-add-prompt-for-function-error-injection.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/error-injection-add-prompt-for-function-error-injection.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
Subject: error-injection: add prompt for function error injection
Date: Mon, 21 Nov 2022 10:44:03 -0500
The config to be able to inject error codes into any function annotated
with ALLOW_ERROR_INJECTION() is enabled when
CONFIG_FUNCTION_ERROR_INJECTION is enabled. But unfortunately, this is
always enabled on x86 when KPROBES is enabled, and there's no way to turn
it off.
As kprobes is useful for observability of the kernel, it is useful to have
it enabled in production environments. But error injection should be
avoided. Add a prompt to the config to allow it to be disabled even when
kprobes is enabled, and get rid of the "def_bool y".
This is a kernel debug feature (it's in Kconfig.debug), and should have
never been something enabled by default.
Link: https://lkml.kernel.org/r/20221121104403.1545f9b5@xxxxxxxxxxxxxxxxxx
Fixes: 540adea3809f6 ("error-injection: Separate error-injection from kprobe")
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Acked-by: Borislav Petkov <bp@xxxxxxx>
Cc: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Florent Revest <revest@xxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: KP Singh <kpsingh@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.debug | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/lib/Kconfig.debug~error-injection-add-prompt-for-function-error-injection
+++ a/lib/Kconfig.debug
@@ -1874,8 +1874,14 @@ config NETDEV_NOTIFIER_ERROR_INJECT
If unsure, say N.
config FUNCTION_ERROR_INJECTION
- def_bool y
+ bool "Fault-injections of functions"
depends on HAVE_FUNCTION_ERROR_INJECTION && KPROBES
+ help
+ Add fault injections into various functions that are annotated with
+ ALLOW_ERROR_INJECTION() in the kernel. BPF may also modify the return
+ value of theses functions. This is useful to test error paths of code.
+
+ If unsure, say N
config FAULT_INJECTION
bool "Fault-injection framework"
_
Patches currently in -mm which might be from rostedt@xxxxxxxxxxx are
error-injection-add-prompt-for-function-error-injection.patch
