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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id 21sm4764913pfh.103.2021.05.28.11.13.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 May 2021 11:13:40 -0700 (PDT) From: Kees Cook To: "Martin K . Petersen" Cc: Kees Cook , Hannes Reinecke , "James E.J. Bottomley" , "Gustavo A. R. Silva" , Bradley Grove , Artur Paszkiewicz , linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH 2/3] scsi: esas2r: Switch to flexible array member Date: Fri, 28 May 2021 11:13:36 -0700 Message-Id: <20210528181337.792268-3-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210528181337.792268-1-keescook@chromium.org> References: <20210528181337.792268-1-keescook@chromium.org> MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; g=ed33a7a5f3363106fee565de7dbeee0ed0e40367; i=BYSzddwUIutLMyBe4gwWgWRPW0Hyydpyw0TO1883Jzg=; m=YbO8CRPgssEoXh7CdGXaGg4HSn/4MdRiTXs7ilaylIE=; p=lWDkVNs9OQuwMDzmOamHffGHEwqku1AwhzpCn4AKrps= X-Patch-Sig: m=pgp; i=keescook@chromium.org; s=0x0x8972F4DFDC6DC026; b=iQIzBAABCgAdFiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAmCxMtAACgkQiXL039xtwCYbjxAApoR gVcRcTyxYGtZIQKqX/2G6HqNiiSzqxvfk7xFPlCDVWGGJ2pACdpFHWfIDslPj5dmTaVr+fJ+SemQb Sw+bs48JHiL2nlUIez21DyHDlhO/V7AtPQzFmDgOEBPvgHQcIhhIa3uLiVzjo+3THPMcudJjtrBuM t8Ml1IcYym3eY4cwTCleCwwCujdIe+e+cutoTJZCp6neD0BeAPdfLvyddMC6cr4CtQmzMa6PcWPKL 1V2N7Td3Qi1m6AD2TLlDIffwLiQMjIV6s4zZxp9b1ZyGNIrrwOpBg0vppST0YSCH56/KeEAFZN6bb /JG6hZm8iR56E+X65xV4rOG0+Vjyr+kn9KS5iE7RJo276zzt9PcmnXetpV9XdP4UwS6Xp6fQJuqm3 VYHOSmoPADBUUhoYBHRSU3L3lZNzFFAV1TNYraoafgEaWziHEqnUnpnhie6eW+4fYSMI7nqoGqc5y keC5ukPpw3skUYfe1X7oSUe3Y4og+v0qAInEbcqlcw1QDmtXBcOeOp3z7ZgF/4R8MPmS8RHfNRM5Q daQ8HXLrV6zguj3cCmERbio5z3R7sW4pz9rmvitzVk3ej2aYwDNmioUhExtBwFAVOcR2q7ZahfINn MmzR5Ginfa9TjTS/YTWSkxWsG01LU8dN5oox8qjrzcksZpaVGcyYuaqFlZSOfwRo= Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memcpy(), avoid intentionally writing across neighboring array fields. Remove old-style 1-byte array in favor of a flexible array[1] to avoid future false-positive cross-field memcpy() warning in: esas2r_vda.c: memcpy(vi->cmd.gsv.version_info, esas2r_vdaioctl_versions, ...) The change in struct size doesn't change other structure sizes (it is already maxed out to 256 bytes, for example here: union { struct atto_ioctl_vda_scsi_cmd scsi; struct atto_ioctl_vda_flash_cmd flash; struct atto_ioctl_vda_diag_cmd diag; struct atto_ioctl_vda_cli_cmd cli; struct atto_ioctl_vda_smp_cmd smp; struct atto_ioctl_vda_cfg_cmd cfg; struct atto_ioctl_vda_mgt_cmd mgt; struct atto_ioctl_vda_gsv_cmd gsv; u8 cmd_info[256]; } cmd; No sizes are calculated using the enclosing structure, so no other updates are needed. Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva --- drivers/scsi/esas2r/atioctl.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/esas2r/atioctl.h b/drivers/scsi/esas2r/atioctl.h index 4aca3d52c851..ff2ad9b38575 100644 --- a/drivers/scsi/esas2r/atioctl.h +++ b/drivers/scsi/esas2r/atioctl.h @@ -1141,7 +1141,7 @@ struct __packed atto_ioctl_vda_gsv_cmd { u8 rsp_len; u8 reserved[7]; - u8 version_info[1]; + u8 version_info[]; #define ATTO_VDA_VER_UNSUPPORTED 0xFF };