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[91.157.170.157]) by smtp.gmail.com with ESMTPSA id u14sm294378lja.11.2016.09.22.05.14.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 22 Sep 2016 05:14:17 -0700 (PDT) From: riku.voipio@linaro.org To: qemu-devel@nongnu.org Date: Thu, 22 Sep 2016 15:13:40 +0300 Message-Id: <28298c912e2c379f2b7767b351beeb77f001f27f.1474546244.git.riku.voipio@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: References: X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.85.215.53 Subject: [Qemu-devel] [PULL 20/26] linux-user: ARM: Give SIGSEGV if signal frame setup fails X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: Peter Maydell The 32-bit ARM signal frame setup code was just bailing out on error returns from lock_user_struct calls, without generating the SIGSEGV that should happen here. Wire up error return codes to call force_sigsegv(). Reviewed-by: Richard Henderson Signed-off-by: Peter Maydell Signed-off-by: Riku Voipio --- linux-user/signal.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) -- 2.1.4 diff --git a/linux-user/signal.c b/linux-user/signal.c index 892b527..4383696 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -512,8 +512,7 @@ void signal_init(void) } } -#if !((defined(TARGET_ARM) && !defined(TARGET_AARCH64)) || \ - defined(TARGET_X86_64) || defined(TARGET_UNICORE32)) +#if !(defined(TARGET_X86_64) || defined(TARGET_UNICORE32)) /* Force a SIGSEGV if we couldn't write to memory trying to set * up the signal frame. oldsig is the signal we were trying to handle @@ -1789,7 +1788,7 @@ static void setup_frame_v1(int usig, struct target_sigaction *ka, trace_user_setup_frame(regs, frame_addr); if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - return; + goto sigsegv; } setup_sigcontext(&frame->sc, regs, set->sig[0]); @@ -1802,6 +1801,9 @@ static void setup_frame_v1(int usig, struct target_sigaction *ka, frame_addr + offsetof(struct sigframe_v1, retcode)); unlock_user_struct(frame, frame_addr, 1); + return; +sigsegv: + force_sigsegv(usig); } static void setup_frame_v2(int usig, struct target_sigaction *ka, @@ -1812,7 +1814,7 @@ static void setup_frame_v2(int usig, struct target_sigaction *ka, trace_user_setup_frame(regs, frame_addr); if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - return; + goto sigsegv; } setup_sigframe_v2(&frame->uc, set, regs); @@ -1821,6 +1823,9 @@ static void setup_frame_v2(int usig, struct target_sigaction *ka, frame_addr + offsetof(struct sigframe_v2, retcode)); unlock_user_struct(frame, frame_addr, 1); + return; +sigsegv: + force_sigsegv(usig); } static void setup_frame(int usig, struct target_sigaction *ka, @@ -1846,7 +1851,7 @@ static void setup_rt_frame_v1(int usig, struct target_sigaction *ka, trace_user_setup_rt_frame(env, frame_addr); if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - return /* 1 */; + goto sigsegv; } info_addr = frame_addr + offsetof(struct rt_sigframe_v1, info); @@ -1876,6 +1881,9 @@ static void setup_rt_frame_v1(int usig, struct target_sigaction *ka, env->regs[2] = uc_addr; unlock_user_struct(frame, frame_addr, 1); + return; +sigsegv: + force_sigsegv(usig); } static void setup_rt_frame_v2(int usig, struct target_sigaction *ka, @@ -1888,7 +1896,7 @@ static void setup_rt_frame_v2(int usig, struct target_sigaction *ka, trace_user_setup_rt_frame(env, frame_addr); if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - return /* 1 */; + goto sigsegv; } info_addr = frame_addr + offsetof(struct rt_sigframe_v2, info); @@ -1904,6 +1912,9 @@ static void setup_rt_frame_v2(int usig, struct target_sigaction *ka, env->regs[2] = uc_addr; unlock_user_struct(frame, frame_addr, 1); + return; +sigsegv: + force_sigsegv(usig); } static void setup_rt_frame(int usig, struct target_sigaction *ka,