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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id o134sm4623683pfg.62.2021.07.27.13.59.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 13:59:14 -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 47/64] btrfs: Use memset_after() to clear end of struct Date: Tue, 27 Jul 2021 13:58:38 -0700 Message-Id: <20210727205855.411487-48-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=992; h=from:subject; bh=x7ocbS42SjohNmNf+jZzB+Ex+GPw48UesaUcGwh3RlU=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOKwywaxTW0OzsQGL01qHorKOsTwNUavfO4aV7/ 4MvZRoyJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzigAKCRCJcvTf3G3AJjfPD/ 4mFAUDF6T1seKtO/RA+qdlnriVg5ZRjAEH4H/h8DVsqaNsbNjkXXBxy4IGulp+GUR4SdYtq0qxTEGi dzjW0oiJ4wsB27VOGaHIXnH3D72eToay+7FKJsbTmxYF7qq7gMrBtZQ1lKPJOINEfDXC/GPs4PjHFt erSiS4lXcv7ZSR327qucJFy3X6rUI1vW/mu4I34D4vBVDPz7h/U/kTrFIpqQYU5qc8uY/8yajU/JNs mQ1m36vmx9AipRbk9NySHUPM6/19rIlM3mPS80ucsisVgDP46b0pgtm7X6nxCi9z/OaNCqCtQ+53mA 0TEThqquZzBXubfk3PRoVuwATx/orxB1j62Wns1xX49CmkH6puRyfHwmBSmk7CiM4Sk1wpqm9jnpGt 4DEdfYKvvTV5Mz5v4rooDk17qFI5QfRMISRbIJsWf42ioVfoojhOqA1vWlKc/ndypF47wowasPUGyj OXB4t+t9iIqUUqNtvyQSbgC16g4aG2X6ikTW6WjRC9vOt7wyZSNVoZoXQPD/ZmSRZZpvbQKkN2G4yN Vjn4IFYhXwNdyA0oK5yI/r1Q+WXeC+pvl6zO/L8B/K6xmBwrE0dWZNELGC+dpZM2lHGRXavr/S7tV7 OmHAQOFKQhK7/G9WgHJLShkAumxIBKLFh22qDqffVoP8zhUM+GH0rhbl7Mpw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 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 memset(), avoid intentionally writing across neighboring fields. Use memset_after() so memset() doesn't get confused about writing beyond the destination member that is intended to be the starting point of zeroing through the end of the struct. Signed-off-by: Kees Cook Acked-by: David Sterba --- fs/btrfs/root-tree.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 702dc5441f03..ec9e78f65fca 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -39,10 +39,7 @@ static void btrfs_read_root_item(struct extent_buffer *eb, int slot, need_reset = 1; } if (need_reset) { - memset(&item->generation_v2, 0, - sizeof(*item) - offsetof(struct btrfs_root_item, - generation_v2)); - + memset_after(item, 0, level); generate_random_guid(item->uuid); } }