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block: Replace all non-returning strlcpy with strscpy

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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>
This commit is contained in:
Azeem Shaikh 2023-05-30 15:56:08 +00:00 committed by Jens Axboe
parent 5a0ac57c48
commit 20d099756b
3 changed files with 3 additions and 3 deletions
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2
block/blk-cgroup-fc-appid.c
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@ -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);

2
block/elevator.c
View File

@ -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;

2
block/genhd.c
View File

@ -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);