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([71.212.149.95]) by smtp.gmail.com with ESMTPSA id g9-20020aa796a9000000b006be5af77f06sm3881690pfk.2.2023.10.18.16.31.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Oct 2023 16:31:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1697671902; x=1698276702; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=OQP2+HZbJmIj9sXXPBVMTwI7vC2S6c38AoM7akl90XU=; b=IBuuzY6E+oFSysj0ymtpPsytGO+XLWJHp9Omipe5GFCQ7d8fo1maMom5k7tYXDDRWi 6RZV9X86jzzpz7N9P/tyNnntz451y5iOQa3yC0rPU/vp7+v/guOFnvLz6lCOtja5I4XV rYrkudo7lKT9mqWdDja7EZeL31scldfO/GJP7pAv0PARYh8R+GSiwAznEV7rl8hxZ//k B6LSDDQ+rk5oJVFfmArKYFqSxLs1ObSJsD5qaOaNBeBDUKy3E4z8Hkqu4+Z3+26V7pev ZoUC5LycWJGvdOISPjYFmgMRWX5enpTflDPvySiz3fGHefJbKJrcKSP75M8rakThoJFo wwaA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697671902; x=1698276702; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=OQP2+HZbJmIj9sXXPBVMTwI7vC2S6c38AoM7akl90XU=; b=qJocHFZHalqChORdaHxDJDg3aXuPETGc+G4thmpKtJ5Ajk31b3XuBb8M4yvXKT8UaD aRmOVM9sNEzBQoir1MVVeBD/B83mzLRMMCoNI39d09mQ1AhicYpQuW7otWxMCl4h8wGp G4xRK8uHu24XdkAb9gKvAUj7UzJFi/GSlYSslYSQC52EYlCvpQHgTSTpymllah42JmVN 6xoWmrw4TercJOEb9FNJMiFYsHRucvQaMfMYab7qQZvQ/F+YfgX7kSe97T6OHtjjYFHN 3js6JoM5qv1GEmh4w4o66UR28e1FLIPm66TAT8HjhUqX/xHMNCRZbDU9EZzzotO6GR+D 7QQA== X-Gm-Message-State: AOJu0YwzeuGvNE1hvRQsmJJu64802Vmfi0nnJPzQGmD2W1yXAJ5abNUl YPYSIpYfBJZwP3t0s6ha+8H+UuGqJYcgFu5/MXs= X-Google-Smtp-Source: AGHT+IG9w7aQvEiov3fhjzsyLoZuCqQv31fh2lf4djm2MMCbVsWOXBnZKoFGpptx9KR6dj7Tn5rAMg== X-Received: by 2002:a9d:4d07:0:b0:6bc:fb5f:7b06 with SMTP id n7-20020a9d4d07000000b006bcfb5f7b06mr731046otf.17.1697671901979; Wed, 18 Oct 2023 16:31:41 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: Helge Deller Subject: [PULL 08/14] linux-user: Detect and report host crashes Date: Wed, 18 Oct 2023 16:31:28 -0700 Message-Id: <20231018233134.1594292-9-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231018233134.1594292-1-richard.henderson@linaro.org> References: <20231018233134.1594292-1-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::330; envelope-from=richard.henderson@linaro.org; helo=mail-ot1-x330.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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1697671990358100003 Content-Type: text/plain; charset="utf-8" From: Helge Deller If there is an internal program error in the qemu source code which raises SIGSEGV or SIGBUS, we currently assume the signal belongs to the guest. With an artificial error introduced, we will now print QEMU internal SIGSEGV {code=3DMAPERR, addr=3D(nil)} Signed-off-by: Helge Deller Message-Id: <20230812164314.352131-1-deller@gmx.de> [rth: Use in_code_gen_buffer and die_with_signal; drop backtrace] Signed-off-by: Richard Henderson --- linux-user/signal.c | 69 +++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 63 insertions(+), 6 deletions(-) diff --git a/linux-user/signal.c b/linux-user/signal.c index 84a56b76cc..9fadc51347 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -32,6 +32,7 @@ #include "signal-common.h" #include "host-signal.h" #include "user/safe-syscall.h" +#include "tcg/tcg.h" =20 static struct target_sigaction sigact_table[TARGET_NSIG]; =20 @@ -779,6 +780,50 @@ static inline void rewind_if_in_safe_syscall(void *puc) } } =20 +static G_NORETURN +void die_from_signal(siginfo_t *info) +{ + char sigbuf[4], codebuf[12]; + const char *sig, *code =3D NULL; + + switch (info->si_signo) { + case SIGSEGV: + sig =3D "SEGV"; + switch (info->si_code) { + case SEGV_MAPERR: + code =3D "MAPERR"; + break; + case SEGV_ACCERR: + code =3D "ACCERR"; + break; + } + break; + case SIGBUS: + sig =3D "BUS"; + switch (info->si_code) { + case BUS_ADRALN: + code =3D "ADRALN"; + break; + case BUS_ADRERR: + code =3D "ADRERR"; + break; + } + break; + default: + snprintf(sigbuf, sizeof(sigbuf), "%d", info->si_signo); + sig =3D sigbuf; + break; + } + if (code =3D=3D NULL) { + snprintf(codebuf, sizeof(sigbuf), "%d", info->si_code); + code =3D codebuf; + } + + error_report("QEMU internal SIG%s {code=3D%s, addr=3D%p}", + sig, code, info->si_addr); + die_with_signal(info->si_signo); +} + static void host_signal_handler(int host_sig, siginfo_t *info, void *puc) { CPUState *cpu =3D thread_cpu; @@ -814,16 +859,28 @@ static void host_signal_handler(int host_sig, siginfo= _t *info, void *puc) is_write =3D host_signal_write(info, uc); access_type =3D adjust_signal_pc(&pc, is_write); =20 + /* If this was a write to a TB protected page, restart. */ + if (is_write + && host_sig =3D=3D SIGSEGV + && info->si_code =3D=3D SEGV_ACCERR + && h2g_valid(host_addr) + && handle_sigsegv_accerr_write(cpu, sigmask, pc, guest_addr)) { + return; + } + + /* + * If the access was not on behalf of the guest, within the execut= able + * mapping of the generated code buffer, then it is a host bug. + */ + if (access_type !=3D MMU_INST_FETCH + && !in_code_gen_buffer((void *)(pc - tcg_splitwx_diff))) { + die_from_signal(info); + } + if (host_sig =3D=3D SIGSEGV) { bool maperr =3D true; =20 if (info->si_code =3D=3D SEGV_ACCERR && h2g_valid(host_addr)) { - /* If this was a write to a TB protected page, restart. */ - if (is_write && - handle_sigsegv_accerr_write(cpu, sigmask, pc, guest_ad= dr)) { - return; - } - /* * With reserved_va, the whole address space is PROT_NONE, * which means that we may get ACCERR when we want MAPERR. --=20 2.34.1