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authorAndy Lutomirski <luto@kernel.org>2018-10-03 16:23:49 -0700
committerBen Hutchings <ben@decadent.org.uk>2019-02-11 17:54:31 +0000
commit3d7dc84804b5a949184da17e3a10da87209688c5 (patch)
tree18f1b3f22b80cd851b7cc4f4aa28a785da1962d5
parent9b3e976d8e483c1a7590ca0bbf7a73083adaedb2 (diff)
x86/vdso: Fix vDSO syscall fallback asm constraint regression
commit 02e425668f5c9deb42787d10001a3b605993ad15 upstream. When I added the missing memory outputs, I failed to update the index of the first argument (ebx) on 32-bit builds, which broke the fallbacks. Somehow I must have screwed up my testing or gotten lucky. Add another test to cover gettimeofday() as well. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 715bd9d12f84 ("x86/vdso: Fix asm constraints on vDSO syscall fallbacks") Link: http://lkml.kernel.org/r/21bd45ab04b6d838278fa5bebfa9163eceffa13c.1538608971.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> [bwh: Backported to 3.16: - Drop selftest changes - Adjust filename] Tested-by: Matthew Whitehead <tedheadster@gmail.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
-rw-r--r--arch/x86/vdso/vclock_gettime.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
index 00b5ea4d9189..a3d5326b9e93 100644
--- a/arch/x86/vdso/vclock_gettime.c
+++ b/arch/x86/vdso/vclock_gettime.c
@@ -147,11 +147,11 @@ notrace static long vdso_fallback_gettime(long clock, struct timespec *ts)
asm (
"mov %%ebx, %%edx \n"
- "mov %2, %%ebx \n"
+ "mov %[clock], %%ebx \n"
"call __kernel_vsyscall \n"
"mov %%edx, %%ebx \n"
: "=a" (ret), "=m" (*ts)
- : "0" (__NR_clock_gettime), "g" (clock), "c" (ts)
+ : "0" (__NR_clock_gettime), [clock] "g" (clock), "c" (ts)
: "memory", "edx");
return ret;
}
@@ -162,11 +162,11 @@ notrace static long vdso_fallback_gtod(struct timeval *tv, struct timezone *tz)
asm (
"mov %%ebx, %%edx \n"
- "mov %2, %%ebx \n"
+ "mov %[tv], %%ebx \n"
"call __kernel_vsyscall \n"
"mov %%edx, %%ebx \n"
: "=a" (ret), "=m" (*tv), "=m" (*tz)
- : "0" (__NR_gettimeofday), "g" (tv), "c" (tz)
+ : "0" (__NR_gettimeofday), [tv] "g" (tv), "c" (tz)
: "memory", "edx");
return ret;
}