a799f071ba
- qemu-user: add device mapper and loopback ioctls, enabling kpatkx OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=40
56 lines
2.0 KiB
Diff
56 lines
2.0 KiB
Diff
From ee5137d38109fdcb55a58be447c2c27be2b16eb0 Mon Sep 17 00:00:00 2001
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From: Alexander Graf <agraf@suse.de>
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Date: Tue, 22 Nov 2011 17:53:40 +0100
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Subject: [PATCH] linux-user: fix wait* syscall status returns
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When calling wait4 or waitpid with a status pointer and WNOHANG, the
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syscall can potentially not modify the status pointer input. Now if we
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have guest code like:
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int status = 0;
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waitpid(pid, &status, WNOHANG);
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if (status)
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<breakage>
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then we have to make sure that in case status did not change we actually
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return the guest's initialized status variable instead of our own uninitialized.
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We fail to do so today, as we proxy everything through an uninitialized status
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variable which for me ended up always containing the last error code.
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This patch fixes some test cases when building yast2-core in OBS for ARM.
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Signed-off-by: Alexander Graf <agraf@suse.de>
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---
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linux-user/syscall.c | 8 +++++++-
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1 files changed, 7 insertions(+), 1 deletions(-)
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diff --git a/linux-user/syscall.c b/linux-user/syscall.c
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index 3e6f3bd..f86fe4a 100644
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--- a/linux-user/syscall.c
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+++ b/linux-user/syscall.c
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@@ -4833,7 +4833,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
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#ifdef TARGET_NR_waitpid
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case TARGET_NR_waitpid:
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{
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- int status;
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+ int status = 0;
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+ if (arg2) {
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+ get_user_s32(status, arg2);
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+ }
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ret = get_errno(waitpid(arg1, &status, arg3));
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if (!is_error(ret) && arg2
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&& put_user_s32(host_to_target_waitstatus(status), arg2))
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@@ -6389,6 +6392,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
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rusage_ptr = &rusage;
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else
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rusage_ptr = NULL;
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+ if (status_ptr) {
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+ get_user_s32(status, status_ptr);
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+ }
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ret = get_errno(wait4(arg1, &status, arg3, rusage_ptr));
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if (!is_error(ret)) {
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if (status_ptr) {
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--
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1.6.0.2
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