From: Richard Henderson <richard.henderson@linaro.org>
Date: Tue, 15 Mar 2022 08:43:08 +0000 (-0700)
Subject: linux-user: Properly handle sigset arg to ppoll
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=db36aa7daab77a0780be6c044ad7144ac741043e;p=qmiga%2Fqemu.git

linux-user: Properly handle sigset arg to ppoll

Unblocked signals are never delivered, because we
didn't record the new mask for process_pending_signals.
Handle this with the same mechanism as sigsuspend.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220315084308.433109-6-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 67af40deac..f65045efe6 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1519,8 +1519,7 @@ static abi_long do_ppoll(abi_long arg1, abi_long arg2, abi_long arg3,
     }
     if (ppoll) {
         struct timespec _timeout_ts, *timeout_ts = &_timeout_ts;
-        target_sigset_t *target_set;
-        sigset_t _set, *set = &_set;
+        sigset_t *set = NULL;
 
         if (arg3) {
             if (time64) {
@@ -1539,25 +1538,19 @@ static abi_long do_ppoll(abi_long arg1, abi_long arg2, abi_long arg3,
         }
 
         if (arg4) {
-            if (arg5 != sizeof(target_sigset_t)) {
-                unlock_user(target_pfd, arg1, 0);
-                return -TARGET_EINVAL;
-            }
-
-            target_set = lock_user(VERIFY_READ, arg4,
-                                   sizeof(target_sigset_t), 1);
-            if (!target_set) {
+            ret = process_sigsuspend_mask(&set, arg4, arg5);
+            if (ret != 0) {
                 unlock_user(target_pfd, arg1, 0);
-                return -TARGET_EFAULT;
+                return ret;
             }
-            target_to_host_sigset(set, target_set);
-        } else {
-            set = NULL;
         }
 
         ret = get_errno(safe_ppoll(pfd, nfds, timeout_ts,
                                    set, SIGSET_T_SIZE));
 
+        if (set) {
+            finish_sigsuspend_mask(ret);
+        }
         if (!is_error(ret) && arg3) {
             if (time64) {
                 if (host_to_target_timespec64(arg3, timeout_ts)) {
@@ -1569,9 +1562,6 @@ static abi_long do_ppoll(abi_long arg1, abi_long arg2, abi_long arg3,
                 }
             }
         }
-        if (arg4) {
-            unlock_user(target_set, arg4, 0);
-        }
     } else {
           struct timespec ts, *pts;