On Mon, Oct 03, 2022 at 11:09:12AM +0200, Geert Uytterhoeven wrote: > Hi Greg, > > On Mon, Oct 3, 2022 at 9:28 AM Greg Kroah-Hartman > <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > From: Al Viro <viro@xxxxxxxxxxxxxxxxxx> > > > > [ Upstream commit 06bbaa6dc53cb72040db952053432541acb9adc7 ] > > > > passing kmap_local_page() result to __kernel_write() is unsafe - > > random ->write_iter() might (and 9p one does) get unhappy when > > passed ITER_KVEC with pointer that came from kmap_local_page(). > > > > Fix by providing a variant of __kernel_write() that takes an iov_iter > > from caller (__kernel_write() becomes a trivial wrapper) and adding > > dump_emit_page() that parallels dump_emit(), except that instead of > > __kernel_write() it uses __kernel_write_iter() with ITER_BVEC source. > > > > Fixes: 3159ed57792b "fs/coredump: use kmap_local_page()" > > Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> > > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> > > This will need a follow-up patch, which I have just posted[1], to > not break the build if CONFIG_ELF_CORE is not set. > > [1] https://lore.kernel.org/20221003090657.2053236-1-geert@xxxxxxxxxxxxxx Thanks, now dropped from 5.19 and 5.15 queues. When this gets merged, can you ping stable@xxxxxxxxxx to add them both back? thanks, greg k-h
