This is a note to let you know that I've just added the patch titled
arm64: uprobe: Return EOPNOTSUPP for AARCH32 instruction probing
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-uprobe-return-eopnotsupp-for-aarch32-instruction-probing.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d47422d953e258ad587b5edf2274eb95d08bdc7d Mon Sep 17 00:00:00 2001
From: He Zhe <zhe.he@xxxxxxxxxxxxx>
Date: Tue, 23 Feb 2021 16:25:34 +0800
Subject: arm64: uprobe: Return EOPNOTSUPP for AARCH32 instruction probing
From: He Zhe <zhe.he@xxxxxxxxxxxxx>
commit d47422d953e258ad587b5edf2274eb95d08bdc7d upstream.
As stated in linux/errno.h, ENOTSUPP should never be seen by user programs.
When we set up uprobe with 32-bit perf and arm64 kernel, we would see the
following vague error without useful hint.
The sys_perf_event_open() syscall returned with 524 (INTERNAL ERROR:
strerror_r(524, [buf], 128)=22)
Use EOPNOTSUPP instead to indicate such cases.
Signed-off-by: He Zhe <zhe.he@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210223082535.48730-1-zhe.he@xxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/probes/uprobes.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm64/kernel/probes/uprobes.c
+++ b/arch/arm64/kernel/probes/uprobes.c
@@ -41,7 +41,7 @@ int arch_uprobe_analyze_insn(struct arch
/* TODO: Currently we do not support AARCH32 instruction probing */
if (mm->context.flags & MMCF_AARCH32)
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
else if (!IS_ALIGNED(addr, AARCH64_INSN_SIZE))
return -EINVAL;
Patches currently in stable-queue which might be from zhe.he@xxxxxxxxxxxxx are
queue-4.14/arm64-uprobe-return-eopnotsupp-for-aarch32-instruction-probing.patch
