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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id i1sm3849350pjs.31.2021.07.27.13.59.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 13:59:02 -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 01/64] media: omap3isp: Extract struct group for memcpy() region Date: Tue, 27 Jul 2021 13:57:52 -0700 Message-Id: <20210727205855.411487-2-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=4703; h=from:subject; bh=LCf4h7e2PK4sOgvQBd73gWCkmhRKJC4tH4kH78fVevA=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOAJSAPyozNrKWpqJWAzYod2fmvBM+4l2MwYKWh O4ocQxiJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzgAAKCRCJcvTf3G3AJoP0D/ 9KTuhNSJSjVRPOJFWeuepSlknmUmM/K2t4MDDXqOX/kDkR2wcXh6ttU5lVNW0YgBjHXAF5eWLYpPt5 XHm/KeoOX2MLhuXazp4Ti4YBKlziUsZTs5O6dl8oGQF8vvSOgQVD4x549qIJAaUMy/Q9HqWzVqq85p yP3Plkr/yT7Fr9RDFQxzPqOdsDFBoD1ZLcppau6vdTB0PZWIhyCpFYq2uKiDluWvj75Xhxrp9micdg U2R1bGYEEaNcOOSkguLQYe0+7XbhyY11oRTvhbZEZRUrrqPf99XF/yF1XvvLi6e8z/hVvbVGsEd8Mv Qiu6hKrvxmLG/6Gu1PUewl4RyNN90iXJ3Rh3zLatEPwPBHAFaGnBpr5RP4Ntn7iSsskKZBwlebvul7 dZxKtji4NE+xbeZup0zNKAjAcLeI8QVdmPiAbeqCybdrJc75zf4LhhuDwRXTdbrsXCooEGGuiMw3/v x+EUAxYAP0mwGpMCMNzDB9dpyGAKbRXmGfGhZu9JSilm3k8JsxQ47nQ3+PU4JxTEAGP/RA6CAwR6zV 7KB5mLzU0yyN2b7Az2uKl0RkeneD9qcEy0xqorM/qFH7O+d020ljiEXSwPXdgJdOF7fiAdpmoeK2uM 3RKFyedkYhLmnhtvfdEg6qb1tMNiC33AbBzVnm8LJMBkL2upkdQjzlsDvzsA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@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. Wrap the target region in a common named structure. This additionally fixes a theoretical misalignment of the copy (since the size of "buf" changes between 64-bit and 32-bit, but this is likely never built for 64-bit). FWIW, I think this code is totally broken on 64-bit (which appears to not be a "real" build configuration): it would either always fail (with an uninitialized data->buf_size) or would cause corruption in userspace due to the copy_to_user() in the call path against an uninitialized data->buf value: omap3isp_stat_request_statistics_time32(...) struct omap3isp_stat_data data64; ... omap3isp_stat_request_statistics(stat, &data64); int omap3isp_stat_request_statistics(struct ispstat *stat, struct omap3isp_stat_data *data) ... buf = isp_stat_buf_get(stat, data); static struct ispstat_buffer *isp_stat_buf_get(struct ispstat *stat, struct omap3isp_stat_data *data) ... if (buf->buf_size > data->buf_size) { ... return ERR_PTR(-EINVAL); } ... rval = copy_to_user(data->buf, buf->virt_addr, buf->buf_size); Regardless, additionally initialize data64 to be zero-filled to avoid undefined behavior. Fixes: 378e3f81cb56 ("media: omap3isp: support 64-bit version of omap3isp_stat_data") Signed-off-by: Kees Cook --- drivers/media/platform/omap3isp/ispstat.c | 5 +-- include/uapi/linux/omap3isp.h | 44 +++++++++++++++++------ 2 files changed, 36 insertions(+), 13 deletions(-) diff --git a/drivers/media/platform/omap3isp/ispstat.c b/drivers/media/platform/omap3isp/ispstat.c index 5b9b57f4d9bf..ea8222fed38e 100644 --- a/drivers/media/platform/omap3isp/ispstat.c +++ b/drivers/media/platform/omap3isp/ispstat.c @@ -512,7 +512,7 @@ int omap3isp_stat_request_statistics(struct ispstat *stat, int omap3isp_stat_request_statistics_time32(struct ispstat *stat, struct omap3isp_stat_data_time32 *data) { - struct omap3isp_stat_data data64; + struct omap3isp_stat_data data64 = { }; int ret; ret = omap3isp_stat_request_statistics(stat, &data64); @@ -521,7 +521,8 @@ int omap3isp_stat_request_statistics_time32(struct ispstat *stat, data->ts.tv_sec = data64.ts.tv_sec; data->ts.tv_usec = data64.ts.tv_usec; - memcpy(&data->buf, &data64.buf, sizeof(*data) - sizeof(data->ts)); + data->buf = (uintptr_t)data64.buf; + memcpy(&data->frame, &data64.buf, sizeof(data->frame)); return 0; } diff --git a/include/uapi/linux/omap3isp.h b/include/uapi/linux/omap3isp.h index 87b55755f4ff..0a16af91621f 100644 --- a/include/uapi/linux/omap3isp.h +++ b/include/uapi/linux/omap3isp.h @@ -159,13 +159,25 @@ struct omap3isp_h3a_aewb_config { }; /** - * struct omap3isp_stat_data - Statistic data sent to or received from user - * @ts: Timestamp of returned framestats. - * @buf: Pointer to pass to user. + * struct omap3isp_stat_frame - Statistic data without timestamp nor pointer. + * @buf_size: Size of buffer. * @frame_number: Frame number of requested stats. * @cur_frame: Current frame number being processed. * @config_counter: Number of the configuration associated with the data. */ +struct omap3isp_stat_frame { + __u32 buf_size; + __u16 frame_number; + __u16 cur_frame; + __u16 config_counter; +}; + +/** + * struct omap3isp_stat_data - Statistic data sent to or received from user + * @ts: Timestamp of returned framestats. + * @buf: Pointer to pass to user. + * @frame: Statistic data for frame. + */ struct omap3isp_stat_data { #ifdef __KERNEL__ struct { @@ -176,10 +188,15 @@ struct omap3isp_stat_data { struct timeval ts; #endif void __user *buf; - __u32 buf_size; - __u16 frame_number; - __u16 cur_frame; - __u16 config_counter; + union { + struct { + __u32 buf_size; + __u16 frame_number; + __u16 cur_frame; + __u16 config_counter; + }; + struct omap3isp_stat_frame frame; + }; }; #ifdef __KERNEL__ @@ -189,10 +206,15 @@ struct omap3isp_stat_data_time32 { __s32 tv_usec; } ts; __u32 buf; - __u32 buf_size; - __u16 frame_number; - __u16 cur_frame; - __u16 config_counter; + union { + struct { + __u32 buf_size; + __u16 frame_number; + __u16 cur_frame; + __u16 config_counter; + }; + struct omap3isp_stat_frame frame; + }; }; #endif -- 2.30.2