[brown paperbag] fix coredump breakage
authorAl Viro <viro@zeniv.linux.org.uk>
Tue, 4 Oct 2022 00:26:08 +0000 (20:26 -0400)
committerAl Viro <viro@zeniv.linux.org.uk>
Tue, 4 Oct 2022 00:28:38 +0000 (20:28 -0400)
commit4f526fef91b24197d489ff86789744c67f475bb4
treea5571940e6118d12dacb7f94586e331c6de80277
parent4fe89d07dcc2804c8b562f6c7896a45643d34b2f
[brown paperbag] fix coredump breakage

Let me count the ways in which I'd screwed up:

* when emitting a page, handling of gaps in coredump should happen
before fetching the current file position.
* fix for a problem that occurs on rather uncommon setups (and hadn't
been observed in the wild) had been sent very late in the cycle.
* ... with badly insufficient testing, introducing an easily
reproducible breakage.  Without giving it time to soak in -next.

Fucked-up-by: Al Viro <viro@zeniv.linux.org.uk>
Reported-by: "J. R. Okajima" <hooanon05g@gmail.com>
Tested-by: "J. R. Okajima" <hooanon05g@gmail.com>
Fixes: 06bbaa6dc53c "[coredump] don't use __kernel_write() on kmap_local_page()"
Cc: stable@kernel.org # v6.0-only
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
fs/coredump.c