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authorPeter Maydell <peter.maydell@linaro.org>2017-12-15 15:18:00 +0000
committerLaurent Vivier <laurent@vivier.eu>2018-01-23 14:20:52 +0100
commit10fa993aae539fa8d0da1da17169e05f1dfb4f95 (patch)
tree7a02d9ede63aac44a06dd385a6237e25c96bf0cd /linux-user
parentad762b990fa9da53e203b934583838d4dd371e20 (diff)
linux-user: Translate flags argument to dup3 syscall
The third argument to dup3() is a flags word which may be O_CLOEXEC. We weren't translating this flag from target to host value, which meant that if the target used a different value from the host (eg sparc guest and x86 host) the dup3() call would fail EINVAL. Do the correct translation. Fixes: https://bugs.launchpad.net/qemu/+bug/1704658 Reported-by: Bruno Haible <bruno@clisp.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <1513351080-25917-1-git-send-email-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user')
-rw-r--r--linux-user/syscall.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 39553c81b6..41ded90ee6 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8490,11 +8490,19 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
#endif
#if defined(CONFIG_DUP3) && defined(TARGET_NR_dup3)
case TARGET_NR_dup3:
- ret = get_errno(dup3(arg1, arg2, arg3));
+ {
+ int host_flags;
+
+ if ((arg3 & ~TARGET_O_CLOEXEC) != 0) {
+ return -EINVAL;
+ }
+ host_flags = target_to_host_bitmask(arg3, fcntl_flags_tbl);
+ ret = get_errno(dup3(arg1, arg2, host_flags));
if (ret >= 0) {
fd_trans_dup(arg1, arg2);
}
break;
+ }
#endif
#ifdef TARGET_NR_getppid /* not on alpha */
case TARGET_NR_getppid: