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Date: Fri, 9 Sep 2022 12:52:44 +0800
From: Xingyuan Mo <hdthky0@...il.com>
To: oss-security@...ts.openwall.com
Subject: Linux kernel: information disclosure in stex_queuecommand_lck
Hello,
We found an information disclosure vulnerability in stex_queuecommand_lck() in
drivers/scsi/stex.c through linux v6.0-rc4 which allows an attacker to disclose
sensitive information such as kernel space address.
This issue can be fixed with the following patch:
https://lore.kernel.org/all/20220908145154.2284098-1-gregkh@linuxfoundation.org/
=*=*=*=*=*=*=*=*= Bug Details =*=*=*=*=*=*=*=*=
In drivers/scsi/stex.c:
666: case PASSTHRU_CMD:
667: if (cmd->cmnd[1] == PASSTHRU_GET_DRVVER) {
668: struct st_drvver ver;
669: size_t cp_len = sizeof(ver);
670:
671: ver.major = ST_VER_MAJOR;
672: ver.minor = ST_VER_MINOR;
673: ver.oem = ST_OEM;
674: ver.build = ST_BUILD_VER;
675: ver.signature[0] = PASSTHRU_SIGNATURE;
676: ver.console_id = host->max_id - 1;
677: ver.host_no = hba->host->host_no;
678: cp_len = scsi_sg_copy_from_buffer(cmd, &ver, cp_len);
679: if (sizeof(ver) == cp_len)
680: cmd->result = DID_OK << 16;
681: else
682: cmd->result = DID_ERROR << 16;
683: done(cmd);
684: return 0;
685: }
686: break;
The variable ver is declared off of the stack, but not zeroed out before copied
back to user space, resulting in sensitive information disclosure.
=*=*=*=*=*=*=*=*= Timeline =*=*=*=*=*=*=*=*=
2022-09-08: bug reported
2022-09-08: patch released
=*=*=*=*=*=*=*=*= Credit =*=*=*=*=*=*=*=*=
Xingyuan Mo (@hdthky) and Gengjia Chen (@chengjia4574) of IceSword Lab, 360
Best Regards,
Xingyuan Mo
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