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[2001:4830:134:3::11]) by mx.google.com with ESMTPS id b62si22829840qgb.26.2014.06.09.05.16.19 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Mon, 09 Jun 2014 05:16:19 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Received: from localhost ([::1]:60708 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WtyUt-0003zG-Iy for patch@linaro.org; Mon, 09 Jun 2014 08:16:19 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38036) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WtyUJ-0003Zl-Ce for qemu-devel@nongnu.org; Mon, 09 Jun 2014 08:15:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WtyUD-0005iV-Bq for qemu-devel@nongnu.org; Mon, 09 Jun 2014 08:15:43 -0400 Received: from afflict.kos.to ([92.243.29.197]:40116) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WtyUC-0005iH-Oo for qemu-devel@nongnu.org; Mon, 09 Jun 2014 08:15:37 -0400 Received: from afflict.kos.to (afflict [92.243.29.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by afflict.kos.to (Postfix) with ESMTPSA id 3F9552650B; Mon, 9 Jun 2014 14:15:36 +0200 (CEST) From: riku.voipio@linaro.org To: qemu-devel@nongnu.org Date: Mon, 9 Jun 2014 15:15:35 +0300 Message-Id: <2362c38b8d55d20c0d6041ff41231021bab734b1.1402312713.git.riku.voipio@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: References: X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 92.243.29.197 Cc: peter.maydell@linaro.org, Riku Voipio Subject: [Qemu-devel] [PATCH v3] signal/all/do_sigreturn - remove __get_user checks X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: , List-Help: , List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: riku.voipio@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.128.170 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 From: Riku Voipio Remove "if(__get_user" checks and their related error paths for all architecture's do_sigreturn. Remove the unlock_user_struct when the only way to end up there is from failed lock_user_struct. v3: remove unneccesary sigsegv label as suggested by Peter Signed-off-by: Riku Voipio Reviewed-by: Peter Maydell --- linux-user/signal.c | 59 ++++++++++++++++------------------------------------- 1 file changed, 18 insertions(+), 41 deletions(-) diff --git a/linux-user/signal.c b/linux-user/signal.c index 4a8d1d2..8a9e119 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -1096,11 +1096,9 @@ long do_sigreturn(CPUX86State *env) if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) goto badframe; /* set blocked signals */ - if (__get_user(target_set.sig[0], &frame->sc.oldmask)) - goto badframe; + __get_user(target_set.sig[0], &frame->sc.oldmask); for(i = 1; i < TARGET_NSIG_WORDS; i++) { - if (__get_user(target_set.sig[i], &frame->extramask[i - 1])) - goto badframe; + __get_user(target_set.sig[i], &frame->extramask[i - 1]); } target_to_host_sigset_internal(&set, &target_set); @@ -1896,12 +1894,10 @@ static long do_sigreturn_v1(CPUARMState *env) if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) goto badframe; - if (__get_user(set.sig[0], &frame->sc.oldmask)) - goto badframe; - for(i = 1; i < TARGET_NSIG_WORDS; i++) { - if (__get_user(set.sig[i], &frame->extramask[i - 1])) - goto badframe; - } + __get_user(set.sig[0], &frame->sc.oldmask); + for(i = 1; i < TARGET_NSIG_WORDS; i++) { + __get_user(set.sig[i], &frame->extramask[i - 1]); + } target_to_host_sigset_internal(&host_set, &set); do_sigprocmask(SIG_SETMASK, &host_set, NULL); @@ -1918,7 +1914,6 @@ static long do_sigreturn_v1(CPUARMState *env) return env->regs[0]; badframe: - unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV /* , current */); return 0; } @@ -2985,8 +2980,7 @@ long do_sigreturn(CPUMIPSState *regs) goto badframe; for(i = 0; i < TARGET_NSIG_WORDS; i++) { - if(__get_user(target_set.sig[i], &frame->sf_mask.sig[i])) - goto badframe; + __get_user(target_set.sig[i], &frame->sf_mask.sig[i]); } target_to_host_sigset_internal(&blocked, &target_set); @@ -3627,11 +3621,9 @@ long do_sigreturn(CPUMBState *env) goto badframe; /* Restore blocked signals */ - if (__get_user(target_set.sig[0], &frame->uc.tuc_mcontext.oldmask)) - goto badframe; + __get_user(target_set.sig[0], &frame->uc.tuc_mcontext.oldmask); for(i = 1; i < TARGET_NSIG_WORDS; i++) { - if (__get_user(target_set.sig[i], &frame->extramask[i - 1])) - goto badframe; + __get_user(target_set.sig[i], &frame->extramask[i - 1]); } target_to_host_sigset_internal(&set, &target_set); do_sigprocmask(SIG_SETMASK, &set, NULL); @@ -3644,7 +3636,6 @@ long do_sigreturn(CPUMBState *env) unlock_user_struct(frame, frame_addr, 0); return env->regs[10]; badframe: - unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); } @@ -3802,11 +3793,9 @@ long do_sigreturn(CPUCRISState *env) goto badframe; /* Restore blocked signals */ - if (__get_user(target_set.sig[0], &frame->sc.oldmask)) - goto badframe; + __get_user(target_set.sig[0], &frame->sc.oldmask); for(i = 1; i < TARGET_NSIG_WORDS; i++) { - if (__get_user(target_set.sig[i], &frame->extramask[i - 1])) - goto badframe; + __get_user(target_set.sig[i], &frame->extramask[i - 1]); } target_to_host_sigset_internal(&set, &target_set); do_sigprocmask(SIG_SETMASK, &set, NULL); @@ -3815,7 +3804,6 @@ long do_sigreturn(CPUCRISState *env) unlock_user_struct(frame, frame_addr, 0); return env->regs[10]; badframe: - unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); } @@ -4323,9 +4311,7 @@ long do_sigreturn(CPUS390XState *env) if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { goto badframe; } - if (__get_user(target_set.sig[0], &frame->sc.oldmask[0])) { - goto badframe; - } + __get_user(target_set.sig[0], &frame->sc.oldmask[0]); target_to_host_sigset_internal(&set, &target_set); do_sigprocmask(SIG_SETMASK, &set, NULL); /* ~_BLOCKABLE? */ @@ -4338,7 +4324,6 @@ long do_sigreturn(CPUS390XState *env) return env->regs[2]; badframe: - unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); return 0; } @@ -4879,15 +4864,13 @@ long do_sigreturn(CPUPPCState *env) #if defined(TARGET_PPC64) set.sig[0] = sc->oldmask + ((long)(sc->_unused[3]) << 32); #else - if(__get_user(set.sig[0], &sc->oldmask) || - __get_user(set.sig[1], &sc->_unused[3])) - goto sigsegv; + __get_user(set.sig[0], &sc->oldmask); + __get_user(set.sig[1], &sc->_unused[3]); #endif target_to_host_sigset_internal(&blocked, &set); do_sigprocmask(SIG_SETMASK, &blocked, NULL); - if (__get_user(sr_addr, &sc->regs)) - goto sigsegv; + __get_user(sr_addr, &sc->regs); if (!lock_user_struct(VERIFY_READ, sr, sr_addr, 1)) goto sigsegv; if (restore_user_regs(env, sr, 1)) @@ -5282,12 +5265,10 @@ long do_sigreturn(CPUM68KState *env) /* set blocked signals */ - if (__get_user(target_set.sig[0], &frame->sc.sc_mask)) - goto badframe; + __get_user(target_set.sig[0], &frame->sc.sc_mask); for(i = 1; i < TARGET_NSIG_WORDS; i++) { - if (__get_user(target_set.sig[i], &frame->extramask[i - 1])) - goto badframe; + __get_user(target_set.sig[i], &frame->extramask[i - 1]); } target_to_host_sigset_internal(&set, &target_set); @@ -5301,7 +5282,6 @@ long do_sigreturn(CPUM68KState *env) return d0; badframe: - unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); return 0; } @@ -5556,9 +5536,7 @@ long do_sigreturn(CPUAlphaState *env) } target_sigemptyset(&target_set); - if (__get_user(target_set.sig[0], &sc->sc_mask)) { - goto badframe; - } + __get_user(target_set.sig[0], &sc->sc_mask); target_to_host_sigset_internal(&set, &target_set); do_sigprocmask(SIG_SETMASK, &set, NULL); @@ -5568,7 +5546,6 @@ long do_sigreturn(CPUAlphaState *env) return env->ir[IR_V0]; badframe: - unlock_user_struct(sc, sc_addr, 0); force_sig(TARGET_SIGSEGV); }