| Message ID | 20231213233605.661251-33-iii@linux.ibm.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | kmsan: Enable on s390 | expand |
On Thu, Dec 14, 2023 at 12:24:52AM +0100, Ilya Leoshkevich wrote: > The unwind code can read uninitialized frames. Furthermore, even in > the good case, KMSAN does not emit shadow for backchains. Therefore > disable it for the unwinding functions. > > Reviewed-by: Alexander Potapenko <glider@google.com> > Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> > --- > arch/s390/kernel/unwind_bc.c | 4 ++++ > 1 file changed, 4 insertions(+) Acked-by: Heiko Carstens <hca@linux.ibm.com>
diff --git a/arch/s390/kernel/unwind_bc.c b/arch/s390/kernel/unwind_bc.c index 0ece156fdd7c..cd44be2b6ce8 100644 --- a/arch/s390/kernel/unwind_bc.c +++ b/arch/s390/kernel/unwind_bc.c @@ -49,6 +49,8 @@ static inline bool is_final_pt_regs(struct unwind_state *state, READ_ONCE_NOCHECK(regs->psw.mask) & PSW_MASK_PSTATE; } +/* Avoid KMSAN false positives from touching uninitialized frames. */ +__no_kmsan_checks bool unwind_next_frame(struct unwind_state *state) { struct stack_info *info = &state->stack_info; @@ -118,6 +120,8 @@ bool unwind_next_frame(struct unwind_state *state) } EXPORT_SYMBOL_GPL(unwind_next_frame); +/* Avoid KMSAN false positives from touching uninitialized frames. */ +__no_kmsan_checks void __unwind_start(struct unwind_state *state, struct task_struct *task, struct pt_regs *regs, unsigned long first_frame) {