From 5b5e2985f355c8e99c196d9ce5d02c15bebadfbc Mon Sep 17 00:00:00 2001 From: Alistair Francis Date: Thu, 29 Aug 2019 13:56:21 -0700 Subject: [PATCH] Add support for io_pgetevents_time64 syscall 32-bit architectures that are y2038 safe don't include syscalls that use 32-bit time_t. Instead these architectures have suffixed syscalls that always use a 64-bit time_t. In the case of the io_getevents syscall the syscall has been replaced with the io_pgetevents_time64 syscall instead. This patch changes the io_getevents() function to use the correct syscall based on the avaliable syscalls and the time_t size. We will only use the new 64-bit time_t syscall if the architecture is using a 64-bit time_t. This is to avoid having to deal with 32/64-bit conversions and relying on a 64-bit timespec struct on 32-bit time_t platforms. As of Linux 5.3 there are no 32-bit time_t architectures without __NR_io_getevents. In the future if a 32-bit time_t architecture wants to use the 64-bit syscalls we can handle the conversion. This fixes build failures on 32-bit RISC-V. Signed-off-by: Alistair Francis Reviewed-by: Richard Levitte Reviewed-by: Paul Dale (Merged from https://github.com/openssl/openssl/pull/9819) --- engines/e_afalg.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/engines/e_afalg.c b/engines/e_afalg.c index dacbe358cb..99516cb1bb 100644 --- a/engines/e_afalg.c +++ b/engines/e_afalg.c @@ -125,7 +125,23 @@ static ossl_inline int io_getevents(aio_context_t ctx, long min, long max, struct io_event *events, struct timespec *timeout) { +#if defined(__NR_io_getevents) return syscall(__NR_io_getevents, ctx, min, max, events, timeout); +#elif defined(__NR_io_pgetevents_time64) + /* Let's only support the 64 suffix syscalls for 64-bit time_t. + * This simplifies the code for us as we don't need to use a 64-bit + * version of timespec with a 32-bit time_t and handle converting + * between 64-bit and 32-bit times and check for overflows. + */ + if (sizeof(timeout->tv_sec) == 8) + return syscall(__NR_io_pgetevents_time64, ctx, min, max, events, timeout, NULL); + else { + errno = ENOSYS; + return -1; + } +#else +# error "We require either the io_getevents syscall or __NR_io_pgetevents_time64." +#endif } static void afalg_waitfd_cleanup(ASYNC_WAIT_CTX *ctx, const void *key, -- 2.25.1