[PATCH v6 26/39] s390/cpacf: Unpoison the results of cpacf_trng()
From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: 2024-06-21 00:27:14
Also in:
linux-mm, linux-s390, lkml
Subsystem:
s390 architecture, s390 crypto modules, prng driver, arch random, the rest · Maintainers:
Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Harald Freudenberger, Holger Dengler, Linus Torvalds
Prevent KMSAN from complaining about buffers filled by cpacf_trng() being uninitialized. Tested-by: Alexander Gordeev <agordeev@linux.ibm.com> Reviewed-by: Alexander Potapenko <glider@google.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> --- arch/s390/include/asm/cpacf.h | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h
index c786538e397c..dae8843b164f 100644
--- a/arch/s390/include/asm/cpacf.h
+++ b/arch/s390/include/asm/cpacf.h@@ -12,6 +12,7 @@ #define _ASM_S390_CPACF_H #include <asm/facility.h> +#include <linux/kmsan-checks.h> /* * Instruction opcodes for the CPACF instructions
@@ -542,6 +543,8 @@ static inline void cpacf_trng(u8 *ucbuf, unsigned long ucbuf_len, : [ucbuf] "+&d" (u.pair), [cbuf] "+&d" (c.pair) : [fc] "K" (CPACF_PRNO_TRNG), [opc] "i" (CPACF_PRNO) : "cc", "memory", "0"); + kmsan_unpoison_memory(ucbuf, ucbuf_len); + kmsan_unpoison_memory(cbuf, cbuf_len); } /**
--
2.45.1