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[for-9.0] linux-user: Fix waitid return of siginfo_t and rusage

Message ID 20240405220034.5128-1-richard.henderson@linaro.org
State Superseded
Headers show
Series [for-9.0] linux-user: Fix waitid return of siginfo_t and rusage | expand

Commit Message

Richard Henderson April 5, 2024, 10 p.m. UTC
The copy back to siginfo_t should be conditional only on arg3,
not the specific values that might have been written.
The copy back to rusage was missing entirely.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2262
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/syscall.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

Comments

Philippe Mathieu-Daudé April 9, 2024, 3:35 p.m. UTC | #1
On 6/4/24 00:00, Richard Henderson wrote:
> The copy back to siginfo_t should be conditional only on arg3,
> not the specific values that might have been written.
> The copy back to rusage was missing entirely.
> 

Signed-off-by: Alex Fan <alex.fan.q@gmail.com>

> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2262
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Tested-by: Alex Fan <alex.fan.q@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

> ---
>   linux-user/syscall.c | 22 ++++++++++++++++------
>   1 file changed, 16 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index e12d969c2e..3df2b94d9a 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9272,14 +9272,24 @@  static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
 #ifdef TARGET_NR_waitid
     case TARGET_NR_waitid:
         {
+            struct rusage ru;
             siginfo_t info;
-            info.si_pid = 0;
-            ret = get_errno(safe_waitid(arg1, arg2, &info, arg4, NULL));
-            if (!is_error(ret) && arg3 && info.si_pid != 0) {
-                if (!(p = lock_user(VERIFY_WRITE, arg3, sizeof(target_siginfo_t), 0)))
+
+            ret = get_errno(safe_waitid(arg1, arg2, (arg3 ? &info : NULL),
+                                        arg4, (arg5 ? &ru : NULL)));
+            if (!is_error(ret)) {
+                if (arg3) {
+                    p = lock_user(VERIFY_WRITE, arg3,
+                                  sizeof(target_siginfo_t), 0);
+                    if (!p) {
+                        return -TARGET_EFAULT;
+                    }
+                    host_to_target_siginfo(p, &info);
+                    unlock_user(p, arg3, sizeof(target_siginfo_t));
+                }
+                if (arg5 && host_to_target_rusage(arg5, &ru)) {
                     return -TARGET_EFAULT;
-                host_to_target_siginfo(p, &info);
-                unlock_user(p, arg3, sizeof(target_siginfo_t));
+                }
             }
         }
         return ret;