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vdso/gettimeofday: Validate system call existence for time() and gettimeofday()

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Not all architectures have the system calls for time() and
gettimeofday(). When the system call is missing, the vDSO function
should also not be present.

Validate that.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20260702-vdso-compat_32bit_time-v3-2-db9f36d8d432@linutronix.de
This commit is contained in:
Thomas Weißschuh 2026-07-02 10:21:26 +02:00 committed by Thomas Gleixner
parent dce21fb3d5
commit f8b9467725
1 changed files with 10 additions and 0 deletions
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10
lib/vdso/gettimeofday.c
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@ -12,6 +12,8 @@
#include <vdso/time32.h>
#include <vdso/time64.h>
#include <uapi/linux/unistd.h>
/*
* The generic vDSO implementation requires that gettimeofday.h
* provides:
@ -348,6 +350,10 @@ __cvdso_gettimeofday_data(const struct vdso_time_data *vd,
{
const struct vdso_clock *vc = vd->clock_data;
#ifndef __NR_gettimeofday
BUILD_BUG();
#endif
if (likely(tv != NULL)) {
struct __kernel_timespec ts;
@ -382,6 +388,10 @@ __cvdso_time_data(const struct vdso_time_data *vd, __kernel_old_time_t *time)
const struct vdso_clock *vc = vd->clock_data;
__kernel_old_time_t t;
#ifndef __NR_time
BUILD_BUG();
#endif
if (vdso_is_timens_clock(vc)) {
vd = vdso_timens_data(vd);
vc = vd->clock_data;