Re: [PATCH v2 3/4] selftests/seccomp: powerpc: Set syscall return during ptrace syscall exit

[Christian Brauner]

On Sat, Sep 19, 2020 at 01:06:36AM -0700, Kees Cook wrote:
> Some archs (like powerpc) only support changing the return code during
> syscall exit when ptrace is used. Test entry vs exit phases for which
> portions of the syscall number and return values need to be set at which
> different phases. For non-powerpc, all changes are made during ptrace
> syscall entry, as before. For powerpc, the syscall number is changed at
> ptrace syscall entry and the syscall return value is changed on ptrace
> syscall exit.
> 
> Reported-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
> Suggested-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
> Link: https://lore.kernel.org/linux-kselftest/20200911181012.171027-1-cascardo@xxxxxxxxxxxxx/
> Fixes: 58d0a862f573 ("seccomp: add tests for ptrace hole")
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> ---

Looks good!
Acked-by: Christian Brauner <christian.brauner@xxxxxxxxxx>