Messages in this thread | | | Date | Sat, 7 Oct 2023 13:18:52 +0200 | From | Greg KH <> | Subject | Re: [PATCH] binder: add mutex_lock for mmap and NULL when free |
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On Sat, Oct 07, 2023 at 07:07:40PM +0800, Kassey Li wrote: > > > On 2023/10/7 14:44, Greg KH wrote: > > On Sat, Oct 07, 2023 at 11:40:46AM +0800, Kassey Li wrote: > > > Enforce alloc->mutex in binder_alloc_mmap_handler when add > > > the entry to list. > > > > > > Assign the freed pages/page_ptr to NULL to catch possible > > > use after free with NULL pointer access. > > > > > > Signed-off-by: Kassey Li <quic_yingangl@quicinc.com> > > > --- > > > drivers/android/binder_alloc.c | 5 ++++- > > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > What commit id does this fix? > > there is no specific commit id this change going to fix. > > it is a follow up for commit > 19c987241ca1216a51118b2bd0185b8bc5081783 binder: separate out binder_alloc > functions (mutex lock added for list access in alloc/free) > f2517eb76f1f2f7f89761f9db2b202e89931738c android: binder: Add global lru > shrinker to binder (set page->page_ptr = NULL;) > > the background to raise this change that we are easy hit below crash in > monkey test: > > where a wrong end is passing to > binder_update_page_range, thus calculate a weird index > for > page = &alloc->pages[index]
Obviously it is a fix for some commit, please list that here.
thanks,
greg k-h
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