Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 581/663] arm64: uprobe: Return EOPNOTSUPP for AARCH32 instruction probing | Date | Mon, 1 Mar 2021 17:13:49 +0100 |
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From: He Zhe <zhe.he@windriver.com>
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@windriver.com> Link: https://lore.kernel.org/r/20210223082535.48730-1-zhe.he@windriver.com Cc: <stable@vger.kernel.org> Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- 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 @@ -38,7 +38,7 @@ 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;
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