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Date: Thu, 1 Apr 2021 15:13:17 -0700 From: Kees Cook <keescook@...omium.org> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Kees Cook <keescook@...omium.org>, Christoph Hellwig <hch@....de>, Nathan Chancellor <natechancellor@...il.com>, Arnd Bergmann <arnd@...db.de>, Tejun Heo <tj@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, "Rafael J. Wysocki" <rafael@...nel.org>, Shuah Khan <shuah@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, Kefeng Wang <wangkefeng.wang@...wei.com>, "Matthew Wilcox (Oracle)" <willy@...radead.org>, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org, clang-built-linux@...glegroups.com, Michal Hocko <mhocko@...e.com>, Alexey Dobriyan <adobriyan@...il.com>, Lee Duncan <lduncan@...e.com>, Chris Leech <cleech@...hat.com>, Adam Nichols <adam@...mm-co.com>, linux-hardening@...r.kernel.org Subject: [PATCH v4 0/3] sysfs: Unconditionally use vmalloc for buffer This series improves the defensive posture of sysfs's use of seq_file to gain the vmap guard pages at the end of vmalloc buffers to stop a class of recurring flaw[1]. The long-term goal is to switch sysfs from a buffer to using seq_file directly, but this will take time to refactor. Included is also a Clang fix for NULL arithmetic and an LKDTM test to validate vmalloc guard pages. v4: - fix NULL arithmetic (Arnd) - add lkdtm test - reword commit message v3: https://lore.kernel.org/lkml/20210401022145.2019422-1-keescook@chromium.org/ v2: https://lore.kernel.org/lkml/20210315174851.622228-1-keescook@chromium.org/ v1: https://lore.kernel.org/lkml/20210312205558.2947488-1-keescook@chromium.org/ Thanks! -Kees Arnd Bergmann (1): seq_file: Fix clang warning for NULL pointer arithmetic Kees Cook (2): lkdtm/heap: Add vmalloc linear overflow test sysfs: Unconditionally use vmalloc for buffer drivers/misc/lkdtm/core.c | 3 ++- drivers/misc/lkdtm/heap.c | 21 +++++++++++++++++- drivers/misc/lkdtm/lkdtm.h | 3 ++- fs/kernfs/file.c | 9 +++++--- fs/seq_file.c | 5 ++++- fs/sysfs/file.c | 29 +++++++++++++++++++++++++ include/linux/seq_file.h | 6 +++++ tools/testing/selftests/lkdtm/tests.txt | 3 ++- 8 files changed, 71 insertions(+), 8 deletions(-) -- 2.25.1
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