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[Qemu-devel] [PATCH 1/4] linux-user: fix clock_gettime()
From: |
Dejan Jovicevic |
Subject: |
[Qemu-devel] [PATCH 1/4] linux-user: fix clock_gettime() |
Date: |
Tue, 25 Oct 2016 13:46:14 +0200 |
When timespec stucture pointer points outside the accessible
address space (i.e. it's an invalid pointer), the clock_gettime()
syscall should return with -1 and set the errno to EFAULT.
This wasn't the case, since there was no check if the
host_to_target_timespec() failed. This check was added and
now the syscall behaves appropriately in this situation.
Signed-off-by: Dejan Jovicevic <address@hidden>
---
linux-user/syscall.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 03339ba..e6abfc5 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -11247,7 +11247,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
struct timespec ts;
ret = get_errno(clock_gettime(arg1, &ts));
if (!is_error(ret)) {
- host_to_target_timespec(arg2, &ts);
+ if (host_to_target_timespec(arg2, &ts)) {
+ goto efault;
+ }
}
break;
}
--
1.9.1