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authorThomas Gleixner <tglx@linutronix.de>2019-07-30 09:38:50 (GMT)
committerThomas Gleixner <tglx@linutronix.de>2019-07-30 22:09:09 (GMT)
commitc60a32ea4f459f99b98d383cad3b1ac7cfb3f4be (patch)
tree83480f0b1d8073b96450ebcb43c15114a6bb1cc0
parent502a590a170b3b3d0ad998ee0b639ac0b3db1dfa (diff)
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lib/vdso/32: Provide legacy syscall fallbacks
To address the regression which causes seccomp to deny applications the access to clock_gettime64() and clock_getres64() syscalls because they are not enabled in the existing filters. That trips over the fact that 32bit VDSOs use the new clock_gettime64() and clock_getres64() syscalls in the fallback path. Add a conditional to invoke the 32bit legacy fallback syscalls instead of the new 64bit variants. The conditional can go away once all architectures are converted. Fixes: 00b26474c2f1 ("lib/vdso: Provide generic VDSO implementation") Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Sean Christopherson <sean.j.christopherson@intel.com> Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com> Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1907301134470.1738@nanos.tec.linutronix.de
-rw-r--r--lib/vdso/gettimeofday.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c
index a9e7fd0..e630e7f 100644
--- a/lib/vdso/gettimeofday.c
+++ b/lib/vdso/gettimeofday.c
@@ -125,14 +125,18 @@ __cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res)
ret = __cvdso_clock_gettime_common(clock, &ts);
+#ifdef VDSO_HAS_32BIT_FALLBACK
+ if (unlikely(ret))
+ return clock_gettime32_fallback(clock, res);
+#else
if (unlikely(ret))
ret = clock_gettime_fallback(clock, &ts);
+#endif
if (likely(!ret)) {
res->tv_sec = ts.tv_sec;
res->tv_nsec = ts.tv_nsec;
}
-
return ret;
}
@@ -232,8 +236,14 @@ __cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res)
int ret;
ret = __cvdso_clock_getres_common(clock, &ts);
+
+#ifdef VDSO_HAS_32BIT_FALLBACK
+ if (unlikely(ret))
+ return clock_getres32_fallback(clock, res);
+#else
if (unlikely(ret))
ret = clock_getres_fallback(clock, &ts);
+#endif
if (likely(!ret)) {
res->tv_sec = ts.tv_sec;