Hi!
Le lundi 27 novembre 2023, 18:58:10 CET Greg KH a écrit :
On Mon, Nov 27, 2023 at 06:36:32PM +0100, Francis Laniel wrote:
Hi!
Le lundi 27 novembre 2023, 16:44:22 CET Greg KH a écrit :
On Mon, Nov 27, 2023 at 03:41:31PM +0100, Francis Laniel wrote:
Hi!
Le vendredi 24 novembre 2023, 17:17:04 CET Greg KH a écrit :
On Fri, Nov 24, 2023 at 01:24:13PM +0100, Francis Laniel wrote:
When a kprobe is attached to a function that's name is not unique (is static and shares the name with other functions in the kernel), the kprobe is attached to the first function it finds. This is a bug as the function that it is attaching to is not necessarily the one that the user wants to attach to.
Instead of blindly picking a function to attach to what is ambiguous, error with EADDRNOTAVAIL to let the user know that this function is not unique, and that the user must use another unique function with an address offset to get to the function they want to attach to.
Link: https://lore.kernel.org/all/20231020104250.9537-2-flaniel@linux.mi cros oft .com/
Cc: stable@vger.kernel.org Fixes: 413d37d1eb69 ("tracing: Add kprobe-based event tracer") Suggested-by: Masami Hiramatsu mhiramat@kernel.org Signed-off-by: Francis Laniel flaniel@linux.microsoft.com Link: https://lore.kernel.org/lkml/20230819101105.b0c104ae4494a7d1f2eea7 42@k ern el.org/ Acked-by: Masami Hiramatsu (Google) mhiramat@kernel.org Signed-off-by: Masami Hiramatsu (Google) mhiramat@kernel.org (cherry picked from commit b022f0c7e404887a7c5229788fc99eff9f9a80d5)
kernel/trace/trace_kprobe.c | 48 +++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+)
Again, we need a version for 5.4.y as well before we can take this version.
I sent the 5.4.y patch some times ago, you can find it here: https://lore.kernel.org/stable/20231023113623.36423-2-flaniel@linux.mi cros oft.com/
With the recent batch I sent, I should have cover all the stable kernels. In case I miss one, please indicate it to me so I can fix this problem and ensure all stable kernels have a corresponding patch.
I only see the following in my stable mbox right now: 1 C Nov 27 Francis Laniel (4.4K) ┬─>[PATCH 5.10.y] tracing/
kprobes:
Return EADDRNOTAVAIL when func matches several symbols 2 r C Nov 24 Francis Laniel (4.4K) └─>[PATCH 5.10.y] tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols 3 F Nov 24 To Francis Lani (1.5K) └─>
4 r T Nov 27 Francis Laniel (1.9K) └─> 5 F Nov 27 To Francis Lani (2.0K) └─> 23 r C Nov 24 Francis Laniel (2.7K) [PATCH 4.19.y] tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols 24 r + Nov 27 Francis Laniel (2.0K) └─>
So could you resend them all just to be sure I have all of the latest versions that you wish to have applied?
I normally sent again the patch for version 4.14 to 5.15 (it was already present in 6.1 and 6.6). I tested all of them by building the corresponding kernel with the patch applied before sending, so they should not break compilation or testing.
Can you please confirm me you received them?
Got them now, thanks, I'll dig through them after this latest round of stable kernels gets released.
You are welcome! Take your time, this is indeed a bug fix but not a major one (I am doubtful plenty of people met this). If you find anything wrong with one of the patch, send a message and I will for sure polish it.
thanks,
greg k-h
Best regards.