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authorAzeem Shaikh <azeemshaikh38@gmail.com>2023-05-30 17:56:08 +0200
committerJens Axboe <axboe@kernel.dk>2023-06-01 17:13:31 +0200
commit20d099756b98fa6b5b838448b1ffbce46f4f3283 (patch)
tree7395fa0c837d62973e862518c40d326844533da6
parentblk-ioc: protect ioc_destroy_icq() by 'queue_lock' (diff)
downloadlinux-20d099756b98fa6b5b838448b1ffbce46f4f3283.tar.xz
linux-20d099756b98fa6b5b838448b1ffbce46f4f3283.zip
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>
-rw-r--r--block/blk-cgroup-fc-appid.c2
-rw-r--r--block/elevator.c2
-rw-r--r--block/genhd.c2
3 files changed, 3 insertions, 3 deletions
diff --git a/block/blk-cgroup-fc-appid.c b/block/blk-cgroup-fc-appid.c
index 842e5e1c0f3c..3ec21333f393 100644
--- 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 24909069f872..8400e303fbcb 100644
--- 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 1cb489b927d5..3537b7d7c484 100644
--- 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);