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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id k4-20020a170902ba8400b0015e8d4eb230sm6387973pls.122.2022.05.03.07.44.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 May 2022 07:44:58 -0700 (PDT) From: Kees Cook To: Raju Rangoju Cc: Kees Cook , kernel test robot , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, stable@vger.kernel.org, Heiner Kallweit , Bjorn Helgaas , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] net: chelsio: cxgb4: Avoid potential negative array offset Date: Tue, 3 May 2022 07:44:25 -0700 Message-Id: <20220503144425.2858110-1-keescook@chromium.org> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4431; h=from:subject; bh=+8uAMoqqS0Bcfw8fZYr6KoQkcNcm36Imb2FI1uAd3hw=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBicT/Jv8v/feIVKVuIyt5mmkMRPZzdczQGAeIED/S7 Sue6QWmJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYnE/yQAKCRCJcvTf3G3AJnSlD/ 9g7H+DltIHtP9cfNn3f84D/otBGRybV39ENgfcteZPAekvVAxWbzFXVXjV1DCl2HYb6XH94aYgCCvl VjgPLaI2AgI1z6oeSF4FXEZ8Oj+pmwDMBZOwIXpViXgs7UbPQWvC88ax1BUlLCHKdz1cUtZoY/SohH lRdgXNPqyqFjAUyvop6yPb1TyhHTn6DgIzfF92/c/VwB0rgIci9AuoyQ6xSrrse11Q4Q9IVBGgsUSv IcJThpwqDXdsRe0KtlJf6dRV0aB9v9RX6kEvKrx5T4ovBu6XqgSgW5Kjj1XubGyevRDDyU0k/ttLPh Hpzhx+t9n/UC5k+gCFS3q+e1tGbaVF1LOASAs1nhCw7RnSCT/mekDTlJSKwLN+WxfPvQPjCMCF8wh9 Ra3Gb0Uezm2UiXIkAZ4FbQZPP5MR5zARIfUGmT4ChTTw84uORVP9rRBuv1xxBpuNg3HDmfYzu4/UJM ZDJit+SFwwho3EK2zZlweact3kjnuUzcR+v11rY52Ejxl/H/wf0BVWzmJS7nO3tjeIBLn9E86n5uP+ 3iInLzOk4swgV/dqvq/xjSvecKICXVVtvOgnP1pkYAkguEdt46US/lUJhZI/FMIH7uAcCTbH9ARg/A jTjJNdk3gEUCPfhSDLdbzKvYzfYIr95z2fYT1LAc6hfj/RdtVBlXjY9EhL7g== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Using min_t(int, ...) as a potential array index implies to the compiler that negative offsets should be allowed. This is not the case, though. Replace min_t() with clamp_t(). Fixes the following warning exposed under future CONFIG_FORTIFY_SOURCE improvements: In file included from include/linux/string.h:253, from include/linux/bitmap.h:11, from include/linux/cpumask.h:12, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/rcupdate.h:29, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:14, from include/linux/delay.h:23, from drivers/net/ethernet/chelsio/cxgb4/t4_hw.c:35: drivers/net/ethernet/chelsio/cxgb4/t4_hw.c: In function 't4_get_raw_vpd_par= ams': include/linux/fortify-string.h:46:33: warning: '__builtin_memcpy' pointer o= verflow between offset 29 and size [2147483648, 4294967295] [-Warray-bounds] 46 | #define __underlying_memcpy __builtin_memcpy | ^ include/linux/fortify-string.h:388:9: note: in expansion of macro '__underl= ying_memcpy' 388 | __underlying_##op(p, q, __fortify_size); = \ | ^~~~~~~~~~~~~ include/linux/fortify-string.h:433:26: note: in expansion of macro '__forti= fy_memcpy_chk' 433 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, = \ | ^~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/chelsio/cxgb4/t4_hw.c:2796:9: note: in expansion of ma= cro 'memcpy' 2796 | memcpy(p->id, vpd + id, min_t(int, id_len, ID_LEN)); | ^~~~~~ include/linux/fortify-string.h:46:33: warning: '__builtin_memcpy' pointer o= verflow between offset 0 and size [2147483648, 4294967295] [-Warray-bounds] 46 | #define __underlying_memcpy __builtin_memcpy | ^ include/linux/fortify-string.h:388:9: note: in expansion of macro '__underl= ying_memcpy' 388 | __underlying_##op(p, q, __fortify_size); = \ | ^~~~~~~~~~~~~ include/linux/fortify-string.h:433:26: note: in expansion of macro '__forti= fy_memcpy_chk' 433 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, = \ | ^~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/chelsio/cxgb4/t4_hw.c:2798:9: note: in expansion of ma= cro 'memcpy' 2798 | memcpy(p->sn, vpd + sn, min_t(int, sn_len, SERNUM_LEN)); | ^~~~~~ Additionally remove needless cast from u8[] to char * in last strim() call. Reported-by: kernel test robot Link: https://lore.kernel.org/lkml/202205031926.FVP7epJM-lkp@intel.com Fixes: fc9279298e3a ("cxgb4: Search VPD with pci_vpd_find_ro_info_keyword()= ") Fixes: 24c521f81c30 ("cxgb4: Use pci_vpd_find_id_string() to find VPD ID st= ring") Cc: Raju Rangoju Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: netdev@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Kees Cook --- drivers/net/ethernet/chelsio/cxgb4/t4_hw.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ether= net/chelsio/cxgb4/t4_hw.c index e7b4e3ed056c..f119ec7323e5 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c +++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c @@ -2793,14 +2793,14 @@ int t4_get_raw_vpd_params(struct adapter *adapter, = struct vpd_params *p) goto out; na =3D ret; =20 - memcpy(p->id, vpd + id, min_t(int, id_len, ID_LEN)); + memcpy(p->id, vpd + id, clamp_t(int, id_len, 0, ID_LEN)); strim(p->id); - memcpy(p->sn, vpd + sn, min_t(int, sn_len, SERNUM_LEN)); + memcpy(p->sn, vpd + sn, clamp_t(int, sn_len, 0, SERNUM_LEN)); strim(p->sn); - memcpy(p->pn, vpd + pn, min_t(int, pn_len, PN_LEN)); + memcpy(p->pn, vpd + pn, clamp_t(int, pn_len, 0, PN_LEN)); strim(p->pn); - memcpy(p->na, vpd + na, min_t(int, na_len, MACADDR_LEN)); - strim((char *)p->na); + memcpy(p->na, vpd + na, clamp_t(int, na_len, 0, MACADDR_LEN)); + strim(p->na); =20 out: vfree(vpd); --=20 2.32.0