block: Replace all non-returning strlcpy with strscpy

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230530155608.272266-1-azeemshaikh38@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-cgroup-fc-appid.c b/block/blk-cgroup-fc-appid.c
index 842e5e1..3ec2133 100644 (file)
--- a/block/blk-cgroup-fc-appid.c
+++ b/block/blk-cgroup-fc-appid.c
@@ -34,7 +34,7 @@ int blkcg_set_fc_appid(char *app_id, u64 cgrp_id, size_t app_id_len)
         * the vmid from the fabric.
         * Adding the overhead of a lock is not necessary.
         */
-       strlcpy(blkcg->fc_app_id, app_id, app_id_len);
+       strscpy(blkcg->fc_app_id, app_id, app_id_len);
        css_put(css);
 out_cgrp_put:
        cgroup_put(cgrp);

diff --git a/block/elevator.c b/block/elevator.c
index 2490906..8400e30 100644 (file)
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -751,7 +751,7 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *buf,
        if (!elv_support_iosched(q))
                return count;
 
-       strlcpy(elevator_name, buf, sizeof(elevator_name));
+       strscpy(elevator_name, buf, sizeof(elevator_name));
        ret = elevator_change(q, strstrip(elevator_name));
        if (!ret)
                return count;

diff --git a/block/genhd.c b/block/genhd.c
index 1cb489b..3537b7d 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -253,7 +253,7 @@ int __register_blkdev(unsigned int major, const char *name,
 #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD
        p->probe = probe;
 #endif
-       strlcpy(p->name, name, sizeof(p->name));
+       strscpy(p->name, name, sizeof(p->name));
        p->next = NULL;
        index = major_to_index(major);