Message ID | 20200603182118.14216-1-f4bug@amsat.org |
---|---|
State | New |
Headers | show
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[88.10.103.181]) by smtp.gmail.com with ESMTPSA id t7sm4668907wrq.41.2020.06.03.11.21.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jun 2020 11:21:20 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <f4bug@amsat.org> To: qemu-devel@nongnu.org Subject: [PATCH] hw/sd/sdcard: Restrict Class 6 commands to SCSD cards Date: Wed, 3 Jun 2020 20:21:18 +0200 Message-Id: <20200603182118.14216-1-f4bug@amsat.org> X-Mailer: git-send-email 2.21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit 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. 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Series |
hw/sd/sdcard: Restrict Class 6 commands to SCSD cards
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diff --git a/hw/sd/sd.c b/hw/sd/sd.c index 3c06a0ac6d..da39590f58 100644 --- a/hw/sd/sd.c +++ b/hw/sd/sd.c @@ -905,6 +905,11 @@ static sd_rsp_type_t sd_normal_command(SDState *sd, SDRequest req) sd->multi_blk_cnt = 0; } + if (sd_cmd_class[req.cmd] == 6 && FIELD_EX32(sd->ocr, OCR, CARD_CAPACITY)) { + /* Only Standard Capacity cards support class 6 commands */ + return sd_illegal; + } + switch (req.cmd) { /* Basic commands (Class 0 and Class 1) */ case 0: /* CMD0: GO_IDLE_STATE */
Only SCSD cards support Class 6 (Block Oriented Write Protection) commands. "SD Specifications Part 1 Physical Layer Simplified Spec. v3.01" 4.3.14 Command Functional Difference in Card Capacity Types * Write Protected Group SDHC and SDXC do not support write-protected groups. Issuing CMD28, CMD29 and CMD30 generates the ILLEGAL_COMMAND error. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> --- This patch doesn't fix CVE-2020-13253, but greatly reduce QEMU exposure to it. https://bugs.launchpad.net/qemu/+bug/1880822 --- hw/sd/sd.c | 5 +++++ 1 file changed, 5 insertions(+)