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treewide: Change list_sort to use const pointers

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[ Upstream commit 4f0f586bf0c898233d8f316f471a21db2abd522d ]

list_sort() internally casts the comparison function passed to it
to a different type with constant struct list_head pointers, and
uses this pointer to call the functions, which trips indirect call
Control-Flow Integrity (CFI) checking.

Instead of removing the consts, this change defines the
list_cmp_func_t type and changes the comparison function types of
all list_sort() callers to use const pointers, thus avoiding type
mismatches.

Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210408182843.1754385-10-samitolvanen@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sami Tolvanen
2021-04-08 11:28:34 -07:00
committed by Greg Kroah-Hartman
parent 419fab1cb0
commit 55e6f8b3c0
41 changed files with 90 additions and 72 deletions
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4
fs/xfs/xfs_extent_busy.c
View File

@@ -643,8 +643,8 @@ xfs_extent_busy_wait_all(
int
xfs_extent_busy_ag_cmp(
void *priv,
struct list_head *l1,
struct list_head *l2)
const struct list_head *l1,
const struct list_head *l2)
{
struct xfs_extent_busy *b1 =
container_of(l1, struct xfs_extent_busy, list);