The patch titled
Subject: fs/proc/kcore: correct comment
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
fs-proc-kcore-reinstate-bounce-buffer-for-kcore_text-regions-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fs-proc-kcore-reinstate-bounce-buffer-for-kcore_text-regions-fix.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Subject: fs/proc/kcore: correct comment
Date: Tue, 1 Aug 2023 17:36:08 +0100
Correct comment to be strictly correct about reasoning.
Link: https://lkml.kernel.org/r/525a3f14-74fa-4c22-9fca-9dab4de8a0c3@lucifer.local
Signed-off-by: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Jiri Olsa <olsajiri@xxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Liu Shixin <liushixin2@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Thorsten Leemhuis <regressions@xxxxxxxxxxxxx>
Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/kcore.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/proc/kcore.c~fs-proc-kcore-reinstate-bounce-buffer-for-kcore_text-regions-fix
+++ a/fs/proc/kcore.c
@@ -568,8 +568,8 @@ static ssize_t read_kcore_iter(struct ki
goto out;
}
/*
- * We use _copy_to_iter() to bypass usermode hardening
- * which would otherwise prevent this operation.
+ * We know the bounce buffer is safe to copy from, so
+ * use _copy_to_iter() directly.
*/
} else if (_copy_to_iter(buf, tsz, iter) != tsz) {
ret = -EFAULT;
_
Patches currently in -mm which might be from lstoakes@xxxxxxxxx are
fs-proc-kcore-reinstate-bounce-buffer-for-kcore_text-regions.patch
fs-proc-kcore-reinstate-bounce-buffer-for-kcore_text-regions-fix.patch
