The patch titled
Subject: mm: change fault_in_pages_* to have an unsigned size parameter
has been added to the -mm tree. Its filename is
mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter.patch
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------------------------------------------------------
From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Subject: mm: change fault_in_pages_* to have an unsigned size parameter
fault_in_pages_writeable() and fault_in_pages_readable() treat the size
parameter as unsigned, doing pointer math with the value, so make this
explicit and set it to be a size_t type which all callers currently treat
it as anyway.
This solves the issue where static checkers get nervous seeing pointer
arithmetic happening with a signed value.
Link: https://lkml.kernel.org/r/20210727111136.457638-1-gregkh@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Reported-by: Jordy Zomer <jordy@pwning.systems>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Cc: "Darrick J. Wong" <djwong@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pagemap.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/include/linux/pagemap.h~mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter
+++ a/include/linux/pagemap.h
@@ -786,7 +786,7 @@ extern void add_page_wait_queue(struct p
/*
* Fault everything in given userspace address range in.
*/
-static inline int fault_in_pages_writeable(char __user *uaddr, int size)
+static inline int fault_in_pages_writeable(char __user *uaddr, size_t size)
{
char __user *end = uaddr + size - 1;
@@ -813,7 +813,7 @@ static inline int fault_in_pages_writeab
return 0;
}
-static inline int fault_in_pages_readable(const char __user *uaddr, int size)
+static inline int fault_in_pages_readable(const char __user *uaddr, size_t size)
{
volatile char c;
const char __user *end = uaddr + size - 1;
_
Patches currently in -mm which might be from gregkh@xxxxxxxxxxxxxxxxxxx are
mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter.patch
percpu-remove-export-of-pcpu_base_addr.patch
