From nobody Tue Feb 10 12:13:52 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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; dmarc=fail(p=none dis=none) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1632503473415245.17400230665157; Fri, 24 Sep 2021 10:11:13 -0700 (PDT) Received: from localhost ([::1]:56516 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mTojA-0006JG-7n for importer@patchew.org; Fri, 24 Sep 2021 13:11:12 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48488) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mToY6-0002mZ-N9 for qemu-devel@nongnu.org; Fri, 24 Sep 2021 12:59:46 -0400 Received: from mail-qk1-x72e.google.com ([2607:f8b0:4864:20::72e]:36783) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mToY3-00071w-I0 for qemu-devel@nongnu.org; Fri, 24 Sep 2021 12:59:46 -0400 Received: by mail-qk1-x72e.google.com with SMTP id p4so28962528qki.3 for ; Fri, 24 Sep 2021 09:59:42 -0700 (PDT) Received: from localhost.localdomain (cpe-24-74-129-96.carolina.res.rr.com. [24.74.129.96]) by smtp.gmail.com with ESMTPSA id r13sm7141104qkk.73.2021.09.24.09.59.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Sep 2021 09:59:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=PTxH4FIm8UZKfO6Q1wb4hu+tVJghYRydXpLjkNTr2zo=; b=VJTfst6MefBeUJw+1PD7rTKn4E+MszmdumrP3jlb+MS5MzK0+FBft8HrFzZqaIAiZi 55VfyDP1VOkGOJ6Zxg1berkvS+gqm+IDZbCiOdSnmgm2TPcqnL2cHcQDYQh5pL0LL1tu QxqB2DhcY9PP6HXHFrtYKLy3rlIZ7YE2YoIDznueAq2zJUlddxw/2fjV4DQNYArYius1 aN3KIWeWP42pMLOKfHPQScOA3yEV8NlxmtlZ64uYLlttF+HpT9rjfHGvlQ3rNRpU6KNm tnbprB7mOdzZdUT02BLFLlJDcG6j5WtwLEGLsZ6B+Xhkqfw4tJc4cW1VQiGPTk0u30UT Okcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=PTxH4FIm8UZKfO6Q1wb4hu+tVJghYRydXpLjkNTr2zo=; b=JeSSex8AvJcJog5SIR/d91tDmBKrxyx0XavS6D2/Kpw+snm4NyHWOECCZ2u7HjGAhD FSNOPMRJuwZmwpLcj2COCYqKX/FLkVTmCg8mbYCAZVhLpE2vasFHOxyHxSbexIraaE6a 6y63lSKbSLOxWaWe2R7tYbaBMN5uSg/ffNCP938hLiQMLvuSmDa6E+P4311b8lg1VkoE TPreo6veFHr537E0cOfDd7m4ecCrJyAWfBww5Y45wfbnoLMfye1oGZXkt83MXa0okXCQ U8Uz1S4KkCLzOTSx/hH2HkDnONRyzX1hbwj4Sn6LU1HeL5B7Z6kSHs1XHf5FkhZhqyoQ x5qg== X-Gm-Message-State: AOAM5333j1nlgMDJzdtAYZUELwbsARpezPj49DIB4qATKpLd5xtQp1Kw a1q57Ohvat52t0eYWwYoVFOseY5guhokDg== X-Google-Smtp-Source: ABdhPJx2h/mf/on1G+QFmrxEK5Hj021WGBrocskeRFeiLesUxxeQQml6PqiqEFHlh8SMItm6dgtmZQ== X-Received: by 2002:a37:a88e:: with SMTP id r136mr11551861qke.490.1632502781593; Fri, 24 Sep 2021 09:59:41 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v3 18/27] linux-user/nios2: Fixes for signal frame setup Date: Fri, 24 Sep 2021 12:59:17 -0400 Message-Id: <20210924165926.752809-19-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210924165926.752809-1-richard.henderson@linaro.org> References: <20210924165926.752809-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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; Received-SPF: pass client-ip=2607:f8b0:4864:20::72e; envelope-from=richard.henderson@linaro.org; helo=mail-qk1-x72e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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@linaro.org, laurent@vivier.eu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1632503474504100001 Content-Type: text/plain; charset="utf-8" Do not confuse host and guest addresses. Lock and unlock the target_rt_sigframe structure in setup_rt_sigframe. Since rt_setup_ucontext always returns 0, drop the return value entirely. This eliminates the only write to the err variable in setup_rt_sigframe. Always copy the siginfo structure. Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- linux-user/nios2/signal.c | 49 ++++++++++++++++----------------------- 1 file changed, 20 insertions(+), 29 deletions(-) diff --git a/linux-user/nios2/signal.c b/linux-user/nios2/signal.c index c9a235ded5..95f6d737e1 100644 --- a/linux-user/nios2/signal.c +++ b/linux-user/nios2/signal.c @@ -42,7 +42,7 @@ struct target_rt_sigframe { struct target_ucontext uc; }; =20 -static int rt_setup_ucontext(struct target_ucontext *uc, CPUNios2State *en= v) +static void rt_setup_ucontext(struct target_ucontext *uc, CPUNios2State *e= nv) { unsigned long *gregs =3D uc->tuc_mcontext.gregs; =20 @@ -75,8 +75,6 @@ static int rt_setup_ucontext(struct target_ucontext *uc, = CPUNios2State *env) __put_user(env->regs[R_GP], &gregs[25]); __put_user(env->regs[R_EA], &gregs[27]); __put_user(env->regs[R_SP], &gregs[28]); - - return 0; } =20 static int rt_restore_ucontext(CPUNios2State *env, struct target_ucontext = *uc, @@ -135,8 +133,8 @@ static int rt_restore_ucontext(CPUNios2State *env, stru= ct target_ucontext *uc, return 0; } =20 -static void *get_sigframe(struct target_sigaction *ka, CPUNios2State *env, - size_t frame_size) +static abi_ptr get_sigframe(struct target_sigaction *ka, CPUNios2State *en= v, + size_t frame_size) { unsigned long usp; =20 @@ -144,7 +142,7 @@ static void *get_sigframe(struct target_sigaction *ka, = CPUNios2State *env, usp =3D target_sigsp(get_sp_from_cpustate(env), ka); =20 /* Verify, is it 32 or 64 bit aligned */ - return (void *)((usp - frame_size) & -8UL); + return (usp - frame_size) & -8; } =20 void setup_rt_frame(int sig, struct target_sigaction *ka, @@ -153,26 +151,25 @@ void setup_rt_frame(int sig, struct target_sigaction = *ka, CPUNios2State *env) { struct target_rt_sigframe *frame; - int i, err =3D 0; + abi_ptr frame_addr; + int i; =20 - frame =3D get_sigframe(ka, env, sizeof(*frame)); - - if (ka->sa_flags & SA_SIGINFO) { - tswap_siginfo(&frame->info, info); + frame_addr =3D get_sigframe(ka, env, sizeof(*frame)); + if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { + force_sigsegv(sig); + return; } =20 + tswap_siginfo(&frame->info, info); + /* Create the ucontext. */ __put_user(0, &frame->uc.tuc_flags); __put_user(0, &frame->uc.tuc_link); target_save_altstack(&frame->uc.tuc_stack, env); - err |=3D rt_setup_ucontext(&frame->uc, env); + rt_setup_ucontext(&frame->uc, env); for (i =3D 0; i < TARGET_NSIG_WORDS; i++) { __put_user((abi_ulong)set->sig[i], - (abi_ulong *)&frame->uc.tuc_sigmask.sig[i]); - } - - if (err) { - goto give_sigsegv; + (abi_ulong *)&frame->uc.tuc_sigmask.sig[i]); } =20 /* Set up to return from userspace; jump to fixed address sigreturn @@ -180,19 +177,13 @@ void setup_rt_frame(int sig, struct target_sigaction = *ka, env->regs[R_RA] =3D default_rt_sigreturn; =20 /* Set up registers for signal handler */ - env->regs[R_SP] =3D (unsigned long) frame; - env->regs[4] =3D (unsigned long) sig; - env->regs[5] =3D (unsigned long) &frame->info; - env->regs[6] =3D (unsigned long) &frame->uc; - env->regs[R_EA] =3D (unsigned long) ka->_sa_handler; - return; + env->regs[R_SP] =3D frame_addr; + env->regs[4] =3D sig; + env->regs[5] =3D frame_addr + offsetof(struct target_rt_sigframe, info= ); + env->regs[6] =3D frame_addr + offsetof(struct target_rt_sigframe, uc); + env->regs[R_EA] =3D ka->_sa_handler; =20 -give_sigsegv: - if (sig =3D=3D TARGET_SIGSEGV) { - ka->_sa_handler =3D TARGET_SIG_DFL; - } - force_sigsegv(sig); - return; + unlock_user_struct(frame, frame_addr, 1); } =20 long do_sigreturn(CPUNios2State *env) --=20 2.25.1