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Fixup support for io_pgetevents_time64 syscall

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This is a fixup for the original commit 5b5e2985f3
"Add support for io_pgetevents_time64 syscall" that didn't correctly
work for 32-bit architecutres with a 64-bit time_t that aren't RISC-V.

For a full discussion of the issue see:
5b5e2985f3

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14432)
This commit is contained in:
Alistair Francis 2021-03-04 12:10:11 -05:00 committed by Pauli
parent 4c52ee1dbf
commit e5499a3cac
1 changed files with 44 additions and 15 deletions
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59
engines/e_afalg.c
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@ -124,27 +124,56 @@ static ossl_inline int io_read(aio_context_t ctx, long n, struct iocb **iocb)
return syscall(__NR_io_submit, ctx, n, iocb);
}
/* A version of 'struct timespec' with 32-bit time_t and nanoseconds. */
struct __timespec32
{
__kernel_long_t tv_sec;
__kernel_long_t tv_nsec;
};
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;
#if defined(__NR_io_pgetevents_time64)
/* Check if we are a 32-bit architecture with a 64-bit time_t */
if (sizeof(*timeout) != sizeof(struct __timespec32)) {
int ret = syscall(__NR_io_pgetevents_time64, ctx, min, max, events,
timeout, NULL);
if (ret == 0 || errno != ENOSYS)
return ret;
}
#else
# error "We require either the io_getevents syscall or __NR_io_pgetevents_time64."
#endif
#if defined(__NR_io_getevents)
if (sizeof(*timeout) == sizeof(struct __timespec32))
/*
* time_t matches our architecture length, we can just use
* __NR_io_getevents
*/
return syscall(__NR_io_getevents, ctx, min, max, events, timeout);
else {
/*
* We don't have __NR_io_pgetevents_time64, but we are using a
* 64-bit time_t on a 32-bit architecture. If we can fit the
* timeout value in a 32-bit time_t, then let's do that
* and then use the __NR_io_getevents syscall.
*/
if (timeout && timeout->tv_sec == (long)timeout->tv_sec) {
struct __timespec32 ts32;
ts32.tv_sec = (__kernel_long_t) timeout->tv_sec;
ts32.tv_nsec = (__kernel_long_t) timeout->tv_nsec;
return syscall(__NR_io_getevents, ctx, min, max, events, ts32);
} else {
return syscall(__NR_io_getevents, ctx, min, max, events, NULL);
}
}
#endif
errno = ENOSYS;
return -1;
}
static void afalg_waitfd_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,