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From e5499a3cac1e823c3e0697e8667e952317b70cc8 Mon Sep 17 00:00:00 2001
From: Alistair Francis <alistair.francis@wdc.com>
Date: Thu, 4 Mar 2021 12:10:11 -0500
Subject: [PATCH] Fixup support for io_pgetevents_time64 syscall
This is a fixup for the original commit 5b5e2985f355c8e99c196d9ce5d02c15bebadfbc
"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:
https://github.com/openssl/openssl/commit/5b5e2985f355c8e99c196d9ce5d02c15bebadfbc
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)
Upstream-Status: Accepted
---
engines/e_afalg.c | 55 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 42 insertions(+), 13 deletions(-)
diff --git a/engines/e_afalg.c b/engines/e_afalg.c
index 9480d7c24b..4e9d67db2d 100644
--- a/engines/e_afalg.c
+++ b/engines/e_afalg.c
@@ -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_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;
+ }
+#endif
+
#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);
+ 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 {
- errno = ENOSYS;
- return -1;
+ /*
+ * 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);
+ }
}
-#else
-# error "We require either the io_getevents syscall or __NR_io_pgetevents_time64."
#endif
+
+ errno = ENOSYS;
+ return -1;
}
static void afalg_waitfd_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,
--
2.30.1
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