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fix incorrect arch register use for kprobe func with more parameters #3275

Merged
merged 1 commit into from
Feb 19, 2021
Merged

fix incorrect arch register use for kprobe func with more parameters #3275

merged 1 commit into from
Feb 19, 2021

Commits on Feb 19, 2021

  1. fix incorrect arch register use for kprobe func with more parameters 

    Commit 12107c6 ("use correct arch register for the
4th param of x86_64 syscalls") tries to use proper syscall
specific registers on x86_64 as its 4th param for syscall
is different from non-syscall. Unfortunately, the
implementation also uses syscall arch. register
for non-syscall kernel functions, which is incorrect.

This patch fixed the issue by using syscall arch
registers only for syscalls.

Reported-by: zhenwei pi <pizhenwei@bytedance.com>
Fixes: 12107c6 ("use correct arch register for the 4th param of x86_64 syscalls")
Signed-off-by: Yonghong Song <yhs@fb.com>
    @yonghong-song
    yonghong-song committed Feb 19, 2021
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