linux-kernel - [PATCH] selftests/futex: Convert 32bit timespec struct to 64bit version for 32bit compatibility mode

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Message-Id: <20250609131055.84547-1-terry.tritton@linaro.org>
Date: Mon,  9 Jun 2025 14:10:55 +0100
From: Terry Tritton <terry.tritton@...aro.org>
To: Thomas Gleixner <tglx@...utronix.de>,
	Shuah Khan <shuah@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	André Almeida <andrealmeid@...lia.com>,
	Wei Gao <wegao@...e.com>
Cc: ttritton@...gle.com,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Terry Tritton <terry.tritton@...aro.org>
Subject: [PATCH] selftests/futex: Convert 32bit timespec struct to 64bit version for 32bit compatibility mode

Futex_waitv can not accept old_timespec32 struct, so userspace should
convert it from 32bit to 64bit before syscall in 32bit compatible mode.

This fix is based off [1] 

Link: https://lore.kernel.org/all/20231203235117.29677-1-wegao@suse.com/ [1]

Signed-off-by: Terry Tritton <terry.tritton@...aro.org>
Signed-off-by: Wei Gao <wegao@...e.com>
---

The original patch is for an identically named file and function in ltp
and we need the same fix in kselftest. The patch is near identical with
only a slight change to `syscall` instead of `tst_syscall`.

Is the way I have tagged this appropriate?


 .../testing/selftests/futex/include/futex2test.h  | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/testing/selftests/futex/include/futex2test.h b/tools/testing/selftests/futex/include/futex2test.h
index ea79662405bc..6780e51eb2d6 100644
--- a/tools/testing/selftests/futex/include/futex2test.h
+++ b/tools/testing/selftests/futex/include/futex2test.h
@@ -55,6 +55,13 @@ struct futex32_numa {
 	futex_t numa;
 };
 
+#if !defined(__LP64__)
+struct timespec64 {
+	int64_t tv_sec;
+	int64_t tv_nsec;
+};
+#endif
+
 /**
  * futex_waitv - Wait at multiple futexes, wake on any
  * @waiters:    Array of waiters
@@ -65,7 +72,15 @@ struct futex32_numa {
 static inline int futex_waitv(volatile struct futex_waitv *waiters, unsigned long nr_waiters,
 			      unsigned long flags, struct timespec *timo, clockid_t clockid)
 {
+#if !defined(__LP64__)
+	struct timespec64 timo64 = {0};
+
+	timo64.tv_sec = timo->tv_sec;
+	timo64.tv_nsec = timo->tv_nsec;
+	return syscall(__NR_futex_waitv, waiters, nr_waiters, flags, &timo64, clockid);
+#else
 	return syscall(__NR_futex_waitv, waiters, nr_waiters, flags, timo, clockid);
+#endif
 }
 
 /*
-- 
2.39.5