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[128.178.122.21]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4256af54ecasm240094075e9.12.2024.07.03.08.56.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jul 2024 08:56:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1720022210; x=1720627010; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=LQOK9pjTJjZNue9VVtyWIczQ+3PWwfz24C1CtOqUlZA=; b=ay4o8VTPBsNT1ID6EjFIRgVnCmqRNQY66xmEiWPgpklGla7ViJkksN6FjbXzpCF0Hn 78x3VXzkI7qvzjpvbFJQdLAKPRIolQlCNc/lhW9MLcgevyB6iS9OOrKVCJfZ3ayISwTn 4Pr1RWh4R+50SoLLySSxtrpFzjSqCaYrqcTs8Tnbvzc6l26rDIIyoOGqP9J6/xZnYJ6S mm3K8fX78N0qKtbZ1ZGxhvybLhWI8+0NYl0c8hHo5fQIF/3IjdNLTn5fHzXD4QG66q8q nlKTe6GBehZod4h8nEkrSoOYnhByZtcGEwuhIlvybz2vjTTjy5x3tgPJfHIBa4UXbZnr 1djQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720022210; x=1720627010; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=LQOK9pjTJjZNue9VVtyWIczQ+3PWwfz24C1CtOqUlZA=; b=u9572S1NOdkZaU+rd6QVhHFXWV2yBXmndX4rKNDr6XPo6d1YwX0w/HNIa0tdycjR0+ TxwgE+V4b32h0+gH8FHuMFOrZv8XMU8WDmcno8usHEu4WOtOpZr21J3ZwcgoxcKMIByY 9rZf0Sr7Z/o2zSgOj5//QjAp3ErnfKpS4rpYu9tdhrKDbZ+2J42PvcvQ8mpgFXFmaP2E Na3tYtbkkTcGjCLnDKaV2EquuVKpx5G0E1p+bjtea2LtmmLJW01WFMnrdGeXlfTtjDGb b++bKmOlL2YpMSrRsmJZ/LziG0bFiedPbg2VXZKFtGZ7EtdG8o6BU2ZhQLuaXUfn/rlB RqGQ== X-Forwarded-Encrypted: i=1; AJvYcCXywBdBo38k+29hu5cUBv2b3t9LDloGWOEoE4KzinUtA/y+CoyUkw87zXrj48zdf1Jp4ZmWH5uzYJekIoJwYgwCt/BKe07oLlqpeY2i/WgHaS+UMJrbmbLo6B8= X-Gm-Message-State: AOJu0Yx6479tWRLVspuzP8xBGMrQhWOiwtDRKXsu+SCnE0d5MyCeaPqr rgAZFIQKW81shpvmApTrWe5NY8dlnigIPZLrGx7ypyuJ3/BCOHs= X-Google-Smtp-Source: AGHT+IH8oyet79kwsM7q/NtXVGBjyiEwx3JNh0Cs3AUNER/AD0jpReStLc6LLPvoDz3UGxPwAHcwog== X-Received: by 2002:a05:600c:3b97:b0:424:addc:c79a with SMTP id 5b1f17b1804b1-4257a02c7famr78725205e9.7.1720022210199; Wed, 03 Jul 2024 08:56:50 -0700 (PDT) From: Zheyu Ma To: BALATON Zoltan Cc: Zheyu Ma , qemu-ppc@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH v2] hw/display/sm501: Validate local memory size index in sm501_system_config_write Date: Wed, 3 Jul 2024 17:56:33 +0200 Message-Id: <20240703155633.17352-1-zheyuma97@gmail.com> X-Mailer: git-send-email 2.34.1 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+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::334; envelope-from=zheyuma97@gmail.com; helo=mail-wm1-x334.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 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, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, 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+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1720022235181100003 Content-Type: text/plain; charset="utf-8" Ensure that the local_mem_size_index is within valid bounds and does not exceed the allocated memory size before updating it in sm501_system_config_= write to prevent out-of-bounds read. ASAN log: =3D=3D3067247=3D=3DERROR: AddressSanitizer: global-buffer-overflow on addre= ss 0x55c6586e4d3c at pc 0x55c655d4e0ac bp 0x7ffc9d5c6a10 sp 0x7ffc9d5c6a08 READ of size 4 at 0x55c6586e4d3c thread T0 #0 0x55c655d4e0ab in sm501_2d_operation qemu/hw/display/sm501.c:729:21 #1 0x55c655d4b8a1 in sm501_2d_engine_write qemu/hw/display/sm501.c:1551= :13 Reproducer: cat << EOF | qemu-system-x86_64 \ -display none -machine accel=3Dqtest, -m 512M -machine q35 -nodefaults \ -device sm501 -qtest stdio outl 0xcf8 0x80000814 outl 0xcfc 0xe4000000 outl 0xcf8 0x80000804 outw 0xcfc 0x02 writel 0xe4000010 0xe000 writel 0xe4100010 0x10000 writel 0xe4100008 0x10001 writel 0xe410000c 0x80000000 EOF Signed-off-by: Zheyu Ma --- Changes in v2: - Also check the memory_region_size bound Signed-off-by: Zheyu Ma --- hw/display/sm501.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/hw/display/sm501.c b/hw/display/sm501.c index 26dc8170d8..a878c35dd9 100644 --- a/hw/display/sm501.c +++ b/hw/display/sm501.c @@ -1020,11 +1020,21 @@ static void sm501_system_config_write(void *opaque,= hwaddr addr, s->gpio_63_32_control =3D value & 0xFF80FFFF; break; case SM501_DRAM_CONTROL: - s->local_mem_size_index =3D (value >> 13) & 0x7; - /* TODO : check validity of size change */ + { + int local_mem_size_index =3D (value >> 13) & 0x7; + if (local_mem_size_index < ARRAY_SIZE(sm501_mem_local_size) && + sm501_mem_local_size[local_mem_size_index] <=3D + memory_region_size(&s->local_mem_region)) { + s->local_mem_size_index =3D local_mem_size_index; + } else { + qemu_log_mask(LOG_GUEST_ERROR, + "sm501: Invalid local_mem_size_index value: %d o= r memory size too large\n", + local_mem_size_index); + } s->dram_control &=3D 0x80000000; s->dram_control |=3D value & 0x7FFFFFC3; break; + } case SM501_ARBTRTN_CONTROL: s->arbitration_control =3D value & 0x37777777; break; --=20 2.34.1