linux/drivers/md/md-linear.h
Kees Cook e887544d76 md/md-linear: Annotate struct linear_conf with __counted_by
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct linear_conf.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Song Liu <song@kernel.org>
Cc: linux-raid@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230915200328.never.064-kees@kernel.org
2023-09-22 11:23:01 -07:00

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C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINEAR_H
#define _LINEAR_H
struct dev_info {
struct md_rdev *rdev;
sector_t end_sector;
};
struct linear_conf
{
struct rcu_head rcu;
sector_t array_sectors;
int raid_disks; /* a copy of mddev->raid_disks */
struct dev_info disks[] __counted_by(raid_disks);
};
#endif