Re: [PATCH 01/32] s390/kprobes: Prevent kprobes on instructions with exception table entry

[Ilya Leoshkevich]

On 10/1/26 12:32, Heiko Carstens wrote:
> The mvcos exception handler ex_handler_ua_mvcos() decodes the faulting
> instruction, assuming it is an mvcos instruction. In case the instruction
> is kprobed the decoded instruction is a breakpoint instruction instead,
> which leads to incorrect instruction decoding and potential register
> corruption.
>
> Fix this by simply preventing to set a kprobe on such instructions,
> similar like arm64 is doing it.
>
> Fixes: c488f5187a24 ("s390/uaccess: Shorten raw_copy_from_user() / raw_copy_to_user() inline assemblies")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
> ---
>   arch/s390/kernel/kprobes.c | 3 +++
>   1 file changed, 3 insertions(+)

Reviewed-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>