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SubjectRe: [PATCH v6 3/9] x86: vdso: Expose sigreturn address on vdso to the kernel
On Fri, Sep 04, 2020 at 04:31:41PM -0400, Gabriel Krisman Bertazi wrote:
> Syscall user redirection requires the signal trampoline code to not be
> captured, in order to support returning with a locked selector while
> avoiding recursion back into the signal handler. For ia-32, which has
> the trampoline in the vDSO, expose the entry points to the kernel, such
> that it can avoid dispatching syscalls from that region to userspace.
>
> Changes since V1
> - Change return address to bool (Andy)
>
> Suggested-by: Andy Lutomirski <luto@kernel.org>
> Acked-by: Andy Lutomirski <luto@kernel.org>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>

Look good to me; would anything else benefit from this information?

Reviewed-by: Kees Cook <keescook@chromium.org>

--
Kees Cook

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