From: Peter Maydell <peter.maydell@linaro.org>
Date: Tue, 28 Jun 2011 11:21:57 +0000 (+0100)
Subject: linux-user/syscall.c: Enforce pselect6 sigset size restrictions
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8f04eeb3c094bf370f131e50b7e3da85d08d518f;p=qemu.git

linux-user/syscall.c: Enforce pselect6 sigset size restrictions

Enforce the same restriction on the size of the sigset passed to
pselect6 as the Linux kernel does. This is both correct and silences
a gcc 4.6 warning about a write-only variable.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
---

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index e2f356bb96..90f6789e5f 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -5699,6 +5699,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 
                 if (arg_sigset) {
                     sig.set = &set;
+                    if (arg_sigsize != sizeof(*target_sigset)) {
+                        /* Like the kernel, we enforce correct size sigsets */
+                        ret = -TARGET_EINVAL;
+                        goto fail;
+                    }
                     target_sigset = lock_user(VERIFY_READ, arg_sigset,
                                               sizeof(*target_sigset), 1);
                     if (!target_sigset) {