Message ID | 20210727205855.411487-64-keescook@chromium.org |
---|---|
State | New |
Headers | show
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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id r128sm4687668pfc.155.2021.07.27.14.06.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:06:55 -0700 (PDT) From: Kees Cook <keescook@chromium.org> To: linux-hardening@vger.kernel.org Cc: Kees Cook <keescook@chromium.org>, "Gustavo A. R. Silva" <gustavoars@kernel.org>, Keith Packard <keithpac@amazon.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrew Morton <akpm@linux-foundation.org>, 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 63/64] iwlwifi: dbg_ini: Split memcpy() to avoid multi-field write Date: Tue, 27 Jul 2021 13:58:54 -0700 Message-Id: <20210727205855.411487-64-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=1543; h=from:subject; bh=s7Xq57zTgnpQLZW9o4dFqvke+b60yZlygvvLnoMj4dM=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOO7ylJm1Pef8Nw2Y9AVMYN/aYHsm9YN/NkJMM0 14MmcVqJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzjgAKCRCJcvTf3G3AJh5wD/ 0a9KvpCqyFZ9QKAdlblaiFHTvLu6J0I4KvuS/Pu8WGvbtdHoFcEc1A0J0FqancucuNe2oN76GijGN8 ZmNxkbLuDowcPvHB1KNKV+y/VKyD/GjTqJSFGbHSgE1d3XVQUqA8M80luRN12bHJex3vWEGlQIgVUS eo5mVVxa1vQFLA/APQtdO4QC3S0Rxaeq//vH7IZ+y8uTxf7ChRZtqCWERhOu6zi0YYM7UsadKsQ1UW kuKw1BHS6rVbpMLujJWWAPEyxEe0W/MD7sUJar7lh/sg2nbnVIlvXob+LuNF5xQtZwtIVnlj1/Tx1c JeZYoyxgw4/uvoQF/VaOiL8Fb1Mky8hA3J0Q0KSrMfDlDYr2psRQCz/wYgNiK8aZmkNvU6EyldhpRR jvpt2FEuN89iS51ofpMkKT9jWkj2G2IJnYUpSSBDS7x/6U33s9hWYtpjYFkmrtQS+KN+/zM7e0Wq85 h9kdtxEMB5GcqKunvfEzrJH/6l30zcuWdtxzKr+5eUMIzfT4m7IfJftQW1OHHiIRW8y1i2y9mOZGde lSqRZZ+xSG98+pb5deEI05oPi7AOE1XKeHnMMfVyygop9nOeSAmsJJWm+ExFOnNUkiTzMkM+sJqqiU uZuZWsn+50meKz7mBFEHFWpt++2rlXLf2jFCbTMaiMMKok79IQfcYfkHRDkg== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: <netdev.vger.kernel.org> X-Mailing-List: netdev@vger.kernel.org |
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Introduce strict memcpy() bounds checking
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expand
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diff --git a/drivers/net/wireless/intel/iwlwifi/fw/file.h b/drivers/net/wireless/intel/iwlwifi/fw/file.h index 9a8c7b7a0816..226ccd3a6612 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/file.h +++ b/drivers/net/wireless/intel/iwlwifi/fw/file.h @@ -116,7 +116,7 @@ enum iwl_ucode_tlv_type { struct iwl_ucode_tlv { __le32 type; /* see above */ __le32 length; /* not including type/length fields */ - u8 data[0]; + u8 data[]; }; #define IWL_TLV_UCODE_MAGIC 0x0a4c5749 diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c index 0ddd255a8cc1..f4efddf3e3c3 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c @@ -71,7 +71,8 @@ static int iwl_dbg_tlv_add(const struct iwl_ucode_tlv *tlv, if (!node) return -ENOMEM; - memcpy(&node->tlv, tlv, sizeof(node->tlv) + len); + memcpy(&node->tlv, tlv, sizeof(node->tlv)); + memcpy(node->tlv.data, tlv->data, len); list_add_tail(&node->list, list); return 0;
To avoid a run-time false positive in the stricter FORTIFY_SOURCE memcpy() checks, split the memcpy() into the struct and the data. Additionally switch the data member to a flexible array to follow modern language conventions. Signed-off-by: Kees Cook <keescook@chromium.org> --- drivers/net/wireless/intel/iwlwifi/fw/file.h | 2 +- drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-)