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tomoyo: Use local kmap in tomoyo_dump_page() 

Replace the now deprecated kmap_atomic() with kmap_local_page().

The memcpy does not need atomic semantics, and the removed comment
is now stale - this patch now makes it in sync again. Last but not
least, highmem is going to be removed[0].

Link: https://lore.kernel.org/all/4ff89b72-03ff-4447-9d21-dd6a5fe1550f@app.fastmail.com/ [0]
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
master
Davidlohr Bueso 2025-11-28 14:27:47 -08:00 committed by Tetsuo Handa
parent 7d0a66e4bb
commit a9ea3a2e08
1 changed files with 2 additions and 7 deletions
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9
security/tomoyo/domain.c
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@ -934,17 +934,12 @@ bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
#endif
if (page != dump->page) {
const unsigned int offset = pos % PAGE_SIZE;
/*
* Maybe kmap()/kunmap() should be used here.
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic().
* So do I.
*/
char *kaddr = kmap_atomic(page);
char *kaddr = kmap_local_page(page);
dump->page = page;
memcpy(dump->data + offset, kaddr + offset,
PAGE_SIZE - offset);
kunmap_atomic(kaddr);
kunmap_local(kaddr);
}
/* Same with put_arg_page(page) in fs/exec.c */
#ifdef CONFIG_MMU