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vdso/gettimeofday: Verify COMPAT_32BIT_TIME interactions

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If CONFIG_COMPAT_32BIT_TIME is disabled then the vDSO should not
provide any 32-bit time related functionality.

Add some build-time validations to make sure the architecture-specific
glue satisfies this requirement.

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-v3-9-db9f36d8d432@linutronix.de
This commit is contained in:
Thomas Weißschuh
2026-07-07 23:52:54 +02:00
committed by Thomas Gleixner
parent 2700297b69
commit 369cecd238
1 changed files with 10 additions and 0 deletions
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lib/vdso/gettimeofday.c
+10
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@@ -25,6 +25,8 @@
*/ */
#include <asm/vdso/gettimeofday.h> #include <asm/vdso/gettimeofday.h>
#include <linux/build_bug.h>
/* Bring in default accessors */ /* Bring in default accessors */
#include <vdso/vsyscall.h> #include <vdso/vsyscall.h>
@@ -325,6 +327,8 @@ __cvdso_clock_gettime32_data(const struct vdso_time_data *vd, clockid_t clock,
struct __kernel_timespec ts; struct __kernel_timespec ts;
bool ok; bool ok;
BUILD_BUG_ON(!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME));
ok = __cvdso_clock_gettime_common(vd, clock, &ts); ok = __cvdso_clock_gettime_common(vd, clock, &ts);
if (unlikely(!ok)) if (unlikely(!ok))
@@ -354,6 +358,8 @@ __cvdso_gettimeofday_data(const struct vdso_time_data *vd,
BUILD_BUG(); BUILD_BUG();
#endif #endif
BUILD_BUG_ON(sizeof(tv->tv_sec) != 8 && !IS_ENABLED(CONFIG_COMPAT_32BIT_TIME));
if (likely(tv != NULL)) { if (likely(tv != NULL)) {
struct __kernel_timespec ts; struct __kernel_timespec ts;
@@ -392,6 +398,8 @@ __cvdso_time_data(const struct vdso_time_data *vd, __kernel_old_time_t *time)
BUILD_BUG(); BUILD_BUG();
#endif #endif
BUILD_BUG_ON(sizeof(*time) != 8 && !IS_ENABLED(CONFIG_COMPAT_32BIT_TIME));
if (vdso_is_timens_clock(vc)) { if (vdso_is_timens_clock(vc)) {
vd = vdso_timens_data(vd); vd = vdso_timens_data(vd);
vc = vd->clock_data; vc = vd->clock_data;
@@ -481,6 +489,8 @@ __cvdso_clock_getres_time32_data(const struct vdso_time_data *vd, clockid_t cloc
struct __kernel_timespec ts; struct __kernel_timespec ts;
bool ok; bool ok;
BUILD_BUG_ON(!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME));
ok = __cvdso_clock_getres_common(vd, clock, &ts); ok = __cvdso_clock_getres_common(vd, clock, &ts);
if (unlikely(!ok)) if (unlikely(!ok))