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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>
This commit is contained in:
Kees Cook 2021-05-24 21:36:48 -07:00
parent 73ab4a3509
commit 9ed0a59c0c
1 changed files with 1 additions and 3 deletions
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4
drivers/hwtracing/intel_th/msu.c
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@ -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);
}
}
}