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[88.21.202.17]) by smtp.gmail.com with ESMTPSA id y185sm13370681wmy.11.2020.05.23.12.15.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 May 2020 12:15:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=AdMpyqTCFlk39vXTmF2j6XEmuS3qX56Iy8h4IChD2rE=; b=gbKNzZ+YyBvYcTEK48o3NQh141E3nP6RlZfweMi3pVm5hn9ZUr5+dIQdp4OZBfikll 4agcifFJlMVtxMnIfLJE/6BdFwXWuSnyPWZRcDRPDb0Lg1sf9pCxrxdtxF12gZLNMxmb kCBnKaP72RJkB7tOhKVe7/kODlb3hEVT+qknve45oN5895fNQXORlCQ6UikE9Mai+tDN TuVC9CFE8uGSvXPwJk1tJA5o47dbRvktFoQDOCtYfrsf59b3+YRTbmR+2SpSMSVQgJkf wcvRM9LdWqxWRT20vYTd6PJ3gTa0LIgb33/qQZh5BNFQkRyVZ5lv25Cd3weZZEG8bR4W 22Hw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=AdMpyqTCFlk39vXTmF2j6XEmuS3qX56Iy8h4IChD2rE=; b=T/7co12lTsuINAiI5UrCi51t1guZjWUWOUz+uVwOetrUM+BKxHO9DOlI3fx1QJYu7e qy4+wPa+2F81ELdVqvbTTavEJlqM+Qr+Sxxr/n/4Vmpqph0kULudMvx3TQRV0gvv4M5J 0v/X5VO6hn4YbUmhFOS1euNJuu9RQ4MA0rpb0+rFlgkPY+tS0n7igN1VpnyPRq4qkr5s Vc1KrWueQ+EqRrBQR/62uuXJdE7tcsZi1vaI0gA2KGcGV9TEEtV5gk9KqV1E3PZ8jhr3 yponC+H6TFCnfcP1seWpA5LhLnXJBTF5G/r9YXG+zuTI5Cqd0nrN3UGbqSq42GOBszUN giMA== X-Gm-Message-State: AOAM531uJ6N672q/uaEV1tGdSc1EzKYigxt+FCjWkAAV8ySHCFhxnoOQ /C3SpKdIJG1l7R/TpA4BqJI= X-Google-Smtp-Source: ABdhPJyMpW3LrrN+PrjNd1oKVioCjlnbdpHrQ7cz4jbLOIvuB+BlupyCaf+QggOnwjyld/XjJFerxw== X-Received: by 2002:adf:f990:: with SMTP id f16mr2840152wrr.311.1590261321821; Sat, 23 May 2020 12:15:21 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: Helge Deller , qemu-devel@nongnu.org, Richard Henderson , Sven Schnelle Subject: [PATCH 1/3] hw/display/artist: Check offset in draw_line to avoid buffer over-run Date: Sat, 23 May 2020 21:15:15 +0200 Message-Id: <20200523191517.23684-2-f4bug@amsat.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200523191517.23684-1-f4bug@amsat.org> References: <20200523191517.23684-1-f4bug@amsat.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Type: text/plain; charset="utf-8" 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=2a00:1450:4864:20::441; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wr1-x441.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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: Alexander Bulekov , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Invalid I/O writes can craft an offset out of the vram_buffer range. We avoid: Program terminated with signal SIGSEGV, Segmentation fault. 284 *dst &=3D ~plane_mask; (gdb) bt #0 0x000055d5dccdc5c0 in artist_rop8 (s=3D0x55d5defee510, dst=3D0x7f8e84= ed8216 , val=3D0 '\0= 00') at hw/display/artist.c:284 #1 0x000055d5dccdcf83 in fill_window (s=3D0x55d5defee510, startx=3D22, s= tarty=3D5674, width=3D65, height=3D5697) at hw/display/artist.c:551 #2 0x000055d5dccddfb9 in artist_reg_write (opaque=3D0x55d5defee510, addr= =3D1051140, val=3D4265537, size=3D4) at hw/display/artist.c:902 #3 0x000055d5dcb42a7c in memory_region_write_accessor (mr=3D0x55d5defeea= 10, addr=3D1051140, value=3D0x7ffe57db08c8, size=3D4, shift=3D0, mask=3D429= 4967295, attrs=3D...) at memory.c:483 Reported-by: LLVM libFuzzer Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- hw/display/artist.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/hw/display/artist.c b/hw/display/artist.c index 6261bfe65b..3c2550f6db 100644 --- a/hw/display/artist.c +++ b/hw/display/artist.c @@ -557,7 +557,7 @@ static void fill_window(ARTISTState *s, int startx, int= starty, static void draw_line(ARTISTState *s, int x1, int y1, int x2, int y2, bool update_start, int skip_pix, int max_pix) { - struct vram_buffer *buf; + struct vram_buffer *buf =3D &s->vram_buffer[ARTIST_BUFFER_AP]; uint8_t color; int dx, dy, t, e, x, y, incy, diago, horiz; bool c1; @@ -565,6 +565,12 @@ static void draw_line(ARTISTState *s, int x1, int y1, = int x2, int y2, =20 trace_artist_draw_line(x1, y1, x2, y2); =20 + if (x1 * y1 >=3D buf->size || x2 * y2 >=3D buf->size) { + qemu_log_mask(LOG_GUEST_ERROR, + "draw_line (%d,%d) (%d,%d)\n", x1, y1, x2, y2); + return; + } + if (update_start) { s->vram_start =3D (x2 << 16) | y2; } @@ -622,7 +628,6 @@ static void draw_line(ARTISTState *s, int x1, int y1, i= nt x2, int y2, x =3D x1; y =3D y1; color =3D artist_get_color(s); - buf =3D &s->vram_buffer[ARTIST_BUFFER_AP]; =20 do { if (c1) { --=20 2.21.3