diff options
| author | Azeem Shaikh <azeemshaikh38@gmail.com> | 2023-07-03 17:21:59 +0000 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-07-17 08:18:17 -0600 |
| commit | 16291561e125ef50cb1875227fce9c1583f0de3c (patch) | |
| tree | b4ff133cacc575ef353531779cba8b0bd26ae50f | |
| parent | 222f58ac68cd6f98a52faf9f26a219c996a5aa17 (diff) | |
blk-wbt: Replace 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/20230703172159.3668349-3-azeemshaikh38@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/trace/events/wbt.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/trace/events/wbt.h b/include/trace/events/wbt.h index 9c66e59d859c..4661f0d27062 100644 --- a/include/trace/events/wbt.h +++ b/include/trace/events/wbt.h @@ -33,7 +33,7 @@ TRACE_EVENT(wbt_stat, ), TP_fast_assign( - strlcpy(__entry->name, bdi_dev_name(bdi), + strscpy(__entry->name, bdi_dev_name(bdi), ARRAY_SIZE(__entry->name)); __entry->rmean = stat[0].mean; __entry->rmin = stat[0].min; @@ -68,7 +68,7 @@ TRACE_EVENT(wbt_lat, ), TP_fast_assign( - strlcpy(__entry->name, bdi_dev_name(bdi), + strscpy(__entry->name, bdi_dev_name(bdi), ARRAY_SIZE(__entry->name)); __entry->lat = div_u64(lat, 1000); ), @@ -105,7 +105,7 @@ TRACE_EVENT(wbt_step, ), TP_fast_assign( - strlcpy(__entry->name, bdi_dev_name(bdi), + strscpy(__entry->name, bdi_dev_name(bdi), ARRAY_SIZE(__entry->name)); __entry->msg = msg; __entry->step = step; @@ -141,7 +141,7 @@ TRACE_EVENT(wbt_timer, ), TP_fast_assign( - strlcpy(__entry->name, bdi_dev_name(bdi), + strscpy(__entry->name, bdi_dev_name(bdi), ARRAY_SIZE(__entry->name)); __entry->status = status; __entry->step = step; |