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    SubjectRe: [PATCH 28/32] s390/traps: Unpoison the kernel_stack_overflow()'s pt_regs
    On Wed, Nov 15, 2023 at 9:35 PM Ilya Leoshkevich <iii@linux.ibm.com> wrote:
    >
    > This is normally done by the generic entry code, but the
    > kernel_stack_overflow() flow bypasses it.
    >
    > Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
    Reviewed-by: Alexander Potapenko <glider@google.com>

    > ---
    > arch/s390/kernel/traps.c | 2 ++
    > 1 file changed, 2 insertions(+)
    >
    > diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
    > index 1d2aa448d103..dd7362806dbb 100644
    > --- a/arch/s390/kernel/traps.c
    > +++ b/arch/s390/kernel/traps.c
    > @@ -27,6 +27,7 @@
    > #include <linux/uaccess.h>
    > #include <linux/cpu.h>
    > #include <linux/entry-common.h>
    > +#include <linux/kmsan.h>
    > #include <asm/asm-extable.h>
    > #include <asm/fpu/api.h>
    > #include <asm/vtime.h>
    > @@ -260,6 +261,7 @@ static void monitor_event_exception(struct pt_regs *regs)
    >
    > void kernel_stack_overflow(struct pt_regs *regs)
    > {
    > + kmsan_unpoison_entry_regs(regs);

    I suggest adding a comment here.

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