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block: don't use strcpy to copy blockdev name

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0-day bot flagged the use of strcpy() in blk_trace_setup(), because the
source buffer can theoretically be bigger than the destination buffer.

While none of the current callers pass a string bigger than
BLKTRACE_BDEV_SIZE, use strscpy() to prevent eventual future misuse and
silence the checker warnings.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202602020718.GUEIRyG9-lkp@intel.com/
Fixes: 113cbd6282 ("blktrace: pass blk_user_trace2 to setup functions")
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Johannes Thumshirn 2026-02-03 12:35:28 +01:00 • committed by Jens Axboe
parent 65d466b629
commit ee4784a83f
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/blktrace.c
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@ -793,7 +793,7 @@ int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
return PTR_ERR(bt);
}
blk_trace_setup_finalize(q, name, 1, bt, &buts2);
strcpy(buts.name, buts2.name);
strscpy(buts.name, buts2.name, BLKTRACE_BDEV_SIZE);
mutex_unlock(&q->debugfs_mutex);
if (copy_to_user(arg, &buts, sizeof(buts))) {