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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>
This commit is contained in:
Peter Maydell 2017-12-15 15:18:00 +00:00 committed by Laurent Vivier
parent ad762b990f
commit 10fa993aae
1 changed files with 9 additions and 1 deletions
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linux-user/syscall.c
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@ -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: