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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>
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
View File

@ -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);