From nobody Thu Nov 13 13:36:12 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1580560360856756.9289643642202; Sat, 1 Feb 2020 04:32:40 -0800 (PST) Received: from localhost ([::1]:45672 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ixrx1-0005tF-MX for importer@patchew.org; Sat, 01 Feb 2020 07:32:39 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51796) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ixrsy-0001VT-KM for qemu-devel@nongnu.org; Sat, 01 Feb 2020 07:28:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ixrsw-00020n-R8 for qemu-devel@nongnu.org; Sat, 01 Feb 2020 07:28:28 -0500 Received: from mout.kundenserver.de ([212.227.126.134]:40997) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1ixrsw-0001we-GP for qemu-devel@nongnu.org; Sat, 01 Feb 2020 07:28:26 -0500 Received: from localhost.localdomain ([78.238.229.36]) by mrelayeu.kundenserver.de (mreue009 [212.227.15.167]) with ESMTPSA (Nemesis) id 1McY0L-1jY12a0a8D-00cuwv; Sat, 01 Feb 2020 13:27:53 +0100 From: Laurent Vivier To: qemu-devel@nongnu.org Subject: [PATCH 3/4] linux-user: fix TARGET_NSIG and _NSIG uses Date: Sat, 1 Feb 2020 13:27:45 +0100 Message-Id: <20200201122746.1478003-4-laurent@vivier.eu> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200201122746.1478003-1-laurent@vivier.eu> References: <20200201122746.1478003-1-laurent@vivier.eu> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:A58pRxSyC0i9mJW78ERtAsZVHvI/IaDIu97TPpAlAYdv2/nJEwY oIwJojyPw1l2BL6e8aPOAcqyPDncfx81RcVXk8kYWAjHEyBAz+yEzyy7iNN85R4BGftZsTd IxBaqdtxwLiP9MK9Z1+qE2mYvN6qCuMoTLxZC1dGfeXY0oNypQ2fvNyGWLiysEZv9wnQecS Pak5EYHgowxuyUpFSA0TA== X-UI-Out-Filterresults: notjunk:1;V03:K0:noddaypDHQQ=:Ez3ZNKXuZLW+nzmbn1m4aA QlWc8UzdQZIlUbAKFQNBIvXlVlqQp4MNSy/yoAnlOlZRZ1HOMRNtIlbEv4XOk9YUT6vBSQVXb Q8vg/M3i5Gn1XWjJbkRwJ6c792rL4HRRxVmq8SMJTpmuJ+aBPdrbBVIbOA1eEctd9Uo6weZSu GyfARXKHteLqQ3S+n+0yl+UKwCX123hKFFbKg5I8mu6p5gUeurF1aVxryX3KcOZVas91TSG/k aMIf7lVbQ2OdQVJaxtPnzuXDKDkfYGQPfa0wJLhxEgYwCFc9R2q8odvQgNZYYGO9dhjjKHY03 Z6jjAI0+eNdGxV/3Ec1kMoTGu+bh9smlRyC6VqGuAdokViGlNWeoYvqf9gKz3y5AtPk8rVhMK nBVxkfz9SjsLEqsHigXKrO44tWrv/+cQ0oZUJouzl7/lKGa9gWs1kMHc33h7JMby7CMAuMt15 DcE4tOiDoKMIHZAnemMMiYAzVVZ0UgJuIg1MYLX+scqYfvM3NIbXF+SttSwQjNnk55HZLhvec b0M2zkY9e4o9hceY6t2F3zWgPm8NUiJ7oagmCxBwZ/ysWsMBFWggYP65io3D90kJ8qrDKRE5c D6uNPFRrZRaCUNVAOBnB9nr14eS1ORwxSO532thIp6K2/GGG7fTjhRGoDy7TAgqz1bh/2MTXU R14TiHceMnniFcYZEjMKPU5MNPR9057MtyScoJlOQ1IhEzjuyQmIti4iw51dV5aGW7QKlTxMZ /+bEe9lLGyPhbsG9kubCQUDvvAI7j4TiQtFzKbCcy8upI33UoG4zgDNbd3ty3pyMnLLVItYUI AiXVCfH+uLffkc0N3R5+56yUFZji2snC+7pPo7ioD7ri/+TThJ66eaGo0P3iZ55pJsx/fJA X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 212.227.126.134 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Marlies Ruck , Riku Voipio , Laurent Vivier , Aleksandar Markovic , Josh Kunz , Taylor Simpson , Matus Kysel , milos.stojanovic@rt-rk.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" Valid signal numbers are between 1 (SIGHUP) and SIGRTMAX. System includes define _NSIG to SIGRTMAX + 1, but QEMU (like kernel) defines TARGET_NSIG to TARGET_SIGRTMAX. Fix all the checks involving the signal range. Signed-off-by: Laurent Vivier --- linux-user/signal.c | 51 ++++++++++++++++++++++++++++++++------------- 1 file changed, 37 insertions(+), 14 deletions(-) diff --git a/linux-user/signal.c b/linux-user/signal.c index f42a2e1a82a5..3491f0a7ecb1 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -30,6 +30,15 @@ static struct target_sigaction sigact_table[TARGET_NSIG]; static void host_signal_handler(int host_signum, siginfo_t *info, void *puc); =20 + +/* + * System includes define _NSIG as SIGRTMAX + 1, + * but qemu (like the kernel) defines TARGET_NSIG as TARGET_SIGRTMAX + * and the first signal is SIGHUP defined as 1 + * Signal number 0 is reserved for use as kill(pid, 0), to test whether + * a process exists without sending it a signal. + */ +QEMU_BUILD_BUG_ON(__SIGRTMAX + 1 !=3D _NSIG); static uint8_t host_to_target_signal_table[_NSIG] =3D { [SIGHUP] =3D TARGET_SIGHUP, [SIGINT] =3D TARGET_SIGINT, @@ -67,19 +76,24 @@ static uint8_t host_to_target_signal_table[_NSIG] =3D { [SIGSYS] =3D TARGET_SIGSYS, /* next signals stay the same */ }; -static uint8_t target_to_host_signal_table[_NSIG]; =20 +static uint8_t target_to_host_signal_table[TARGET_NSIG + 1]; + +/* valid sig is between 1 and _NSIG - 1 */ int host_to_target_signal(int sig) { - if (sig < 0 || sig >=3D _NSIG) + if (sig < 1 || sig >=3D _NSIG) { return sig; + } return host_to_target_signal_table[sig]; } =20 +/* valid sig is between 1 and TARGET_NSIG */ int target_to_host_signal(int sig) { - if (sig < 0 || sig >=3D _NSIG) + if (sig < 1 || sig > TARGET_NSIG) { return sig; + } return target_to_host_signal_table[sig]; } =20 @@ -100,11 +114,15 @@ static inline int target_sigismember(const target_sig= set_t *set, int signum) void host_to_target_sigset_internal(target_sigset_t *d, const sigset_t *s) { - int i; + int i, j; target_sigemptyset(d); - for (i =3D 1; i <=3D TARGET_NSIG; i++) { + for (i =3D 1; i < _NSIG; i++) { + j =3D host_to_target_signal(i); + if (j < 1 || j > TARGET_NSIG) { + continue; + } if (sigismember(s, i)) { - target_sigaddset(d, host_to_target_signal(i)); + target_sigaddset(d, j); } } } @@ -122,11 +140,15 @@ void host_to_target_sigset(target_sigset_t *d, const = sigset_t *s) void target_to_host_sigset_internal(sigset_t *d, const target_sigset_t *s) { - int i; + int i, j; sigemptyset(d); for (i =3D 1; i <=3D TARGET_NSIG; i++) { + j =3D target_to_host_signal(i); + if (j < 1 || j >=3D _NSIG) { + continue; + } if (target_sigismember(s, i)) { - sigaddset(d, target_to_host_signal(i)); + sigaddset(d, j); } } } @@ -488,13 +510,14 @@ static void signal_table_init(void) host_to_target_signal_table[__SIGRTMAX] =3D __SIGRTMIN; =20 /* generate signal conversion tables */ - for(i =3D 1; i < _NSIG; i++) { - if (host_to_target_signal_table[i] =3D=3D 0) + for (i =3D 1; i < _NSIG; i++) { + if (host_to_target_signal_table[i] =3D=3D 0) { host_to_target_signal_table[i] =3D i; - } - for(i =3D 1; i < _NSIG; i++) { + } j =3D host_to_target_signal_table[i]; - target_to_host_signal_table[j] =3D i; + if (j <=3D TARGET_NSIG) { + target_to_host_signal_table[j] =3D i; + } } } =20 @@ -517,7 +540,7 @@ void signal_init(void) act.sa_sigaction =3D host_signal_handler; for(i =3D 1; i <=3D TARGET_NSIG; i++) { #ifdef TARGET_GPROF - if (i =3D=3D SIGPROF) { + if (i =3D=3D TARGET_SIGPROF) { continue; } #endif --=20 2.24.1