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error-injection: Add prompt for function error injection 

The config to be able to inject error codes into any function annotated
with ALLOW_ERROR_INJECTION() is enabled when 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.

Cc: stable@vger.kernel.org
Fixes: 540adea380 ("error-injection: Separate error-injection from kprobe")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Steven Rostedt (Google) 2022-11-21 10:44:03 -05:00 committed by Linus Torvalds
parent 355479c70a
commit a4412fdd49
1 changed files with 7 additions and 1 deletions
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8
lib/Kconfig.debug
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@ -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"