[PATCH v2 9/9] vdso/gettimeofday: Verify COMPAT_32BIT_TIME interactions
From: Thomas Weißschuh <hidden>
Date: 2026-06-30 07:38:43
Also in:
linux-api, linux-arm-kernel, linux-mips, lkml, sparclinux
Subsystem:
generic vdso library, library code, the rest · Maintainers:
Andy Lutomirski, Thomas Gleixner, Vincenzo Frascino, Andrew Morton, Linus Torvalds
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 <redacted> --- lib/vdso/gettimeofday.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c
index b8c1fc85eb74..f7a591aba59f 100644
--- a/lib/vdso/gettimeofday.c
+++ b/lib/vdso/gettimeofday.c@@ -25,6 +25,8 @@ */ #include <asm/vdso/gettimeofday.h> +#include <linux/build_bug.h> + /* Bring in default accessors */ #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; bool ok; + BUILD_BUG_ON(!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME)); + ok = __cvdso_clock_gettime_common(vd, clock, &ts); if (unlikely(!ok))
@@ -354,6 +358,8 @@ __cvdso_gettimeofday_data(const struct vdso_time_data *vd, BUILD_BUG(); #endif + BUILD_BUG_ON(sizeof(tv->tv_sec) != 8 && !IS_ENABLED(CONFIG_COMPAT_32BIT_TIME)); + if (likely(tv != NULL)) { struct __kernel_timespec ts;
@@ -392,6 +398,8 @@ __cvdso_time_data(const struct vdso_time_data *vd, __kernel_old_time_t *time) BUILD_BUG(); #endif + BUILD_BUG_ON(sizeof(*time) != 8 && !IS_ENABLED(CONFIG_COMPAT_32BIT_TIME)); + if (vdso_is_timens_clock(vc)) { vd = vdso_timens_data(vd); 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; bool ok; + BUILD_BUG_ON(!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME)); + ok = __cvdso_clock_getres_common(vd, clock, &ts); if (unlikely(!ok))
--
2.55.0