diff options
| author | Kees Cook <keescook@chromium.org> | 2021-05-24 21:36:48 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-02-13 16:48:04 -0800 |
| commit | 9ed0a59c0cbb663ea09588322498499a937d08fa (patch) | |
| tree | 5b15990b47663467ab6fff08328a645671e2038b | |
| parent | 73ab4a3509e6b8f93b87398db2aaabd3c9cbe487 (diff) | |
intel_th: msu: Use memset_startat() for clearing hw header
In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memset(), avoid intentionally writing across
neighboring fields.
Use memset_startat() 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.
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Link: https://lore.kernel.org/lkml/87sfyzi97l.fsf@ashishki-desk.ger.corp.intel.com
Signed-off-by: Kees Cook <keescook@chromium.org>
| -rw-r--r-- | drivers/hwtracing/intel_th/msu.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c index 432ade0842f6..70a07b4e9967 100644 --- a/drivers/hwtracing/intel_th/msu.c +++ b/drivers/hwtracing/intel_th/msu.c @@ -658,13 +658,11 @@ static void msc_buffer_clear_hw_header(struct msc *msc) list_for_each_entry(win, &msc->win_list, entry) { unsigned int blk; - size_t hw_sz = sizeof(struct msc_block_desc) - - offsetof(struct msc_block_desc, hw_tag); for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { struct msc_block_desc *bdesc = sg_virt(sg); - memset(&bdesc->hw_tag, 0, hw_sz); + memset_startat(bdesc, 0, hw_tag); } } } |