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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id d29sm4704061pfq.193.2021.07.27.14.06.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:06:54 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , "Gustavo A. R. Silva" , Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com Subject: [PATCH 17/64] iommu/amd: Use struct_group() for memcpy() region Date: Tue, 27 Jul 2021 13:58:08 -0700 Message-Id: <20210727205855.411487-18-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727205855.411487-1-keescook@chromium.org> References: <20210727205855.411487-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1451; h=from:subject; bh=3pnVXRScRiXcKlAzWmxtHjgtqdCSr5x9f+6aO5KQ5qc=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHODYV9h07PQ3v5RAvzij9k85T7DPu/8sNSs65Q4 0y0UliiJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzgwAKCRCJcvTf3G3AJiW2D/ 4nEDA70nGUYhVyf7oYOlQgzyry3f6d0tKPbEYWNkte1rIRW3O2InK76AVJyf0Q/BtnVYPXNStIrzaO SUDw2yOwXO4oq2+xlKHbSpDQcYZna36Xqovo10kVGY112L7kOGbUfQZZPm+9ZCxh9fprwP+ezpdrPw 5RhPSv0UwMiQYY/cih9csRF3Y0cUslbWzBAlMAKY4vV665FdBYm4Cd1UbBRiX7n5X6rkASp/R5KUJO gT9lqJlutTZcY84HhE2e7nVfUM1tK/zoQ1ZeRZ2l14KFhykcFSW9gTHS3VJa2Fr3ta26jaAzpIQzRI I1VZSdlxpEUPAljbEi8ms11eBPC5N8+yPox2bH9yz8bPLwwHOwyP+yRXagJSrsB0JY9elrri4Jr0d4 L0spfyNNFhXi1pYLN/VwHLWk0qCJ6U6H1/1yJ5fkSANbabpn+M+34UuJ87NhDZnoboRjX68s2N9xUp Ztc8gb6cNuq1OK7yjw+/s+IPxRe2Xrjyj6xMHQ75Nmq+kDqedEV8h/okfZHv9FN6eZGw8+d+79qrHr /MdSe/HI+xPECZcwJiIqojDU9hyrQ75Slj1hn65lXR2jBuZkuxOB9VWtjVZyPGXbccWBvdccl0Sthp x+6FisSerA0XyrnefqEYTnx+5XYfaYWhfusWvoUDsVRDlD5XjnXe/NKxjhWQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memcpy(), memmove(), and memset(), avoid intentionally writing across neighboring fields. Use struct_group() in struct ivhd_entry around members ext and hidh, so they can be referenced together. This will allow memcpy() and sizeof() to more easily reason about sizes, improve readability, and avoid future warnings about writing beyond the end of ext. "pahole" shows no size nor member offset changes to struct ivhd_entry. "objdump -d" shows no object code changes. Signed-off-by: Kees Cook --- drivers/iommu/amd/init.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c index 46280e6e1535..2df84737417b 100644 --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -121,8 +121,10 @@ struct ivhd_entry { u8 type; u16 devid; u8 flags; - u32 ext; - u32 hidh; + struct_group(ext_hid, + u32 ext; + u32 hidh; + ); u64 cid; u8 uidf; u8 uidl; @@ -1378,7 +1380,8 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu, break; } - memcpy(hid, (u8 *)(&e->ext), ACPIHID_HID_LEN - 1); + BUILD_BUG_ON(sizeof(e->ext_hid) != ACPIHID_HID_LEN - 1); + memcpy(hid, &e->ext_hid, ACPIHID_HID_LEN - 1); hid[ACPIHID_HID_LEN - 1] = '\0'; if (!(*hid)) { -- 2.30.2