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blk-wbt: Replace 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/20230703172159.3668349-3-azeemshaikh38@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Azeem Shaikh 2023-07-03 17:21:59 +00:00 committed by Jens Axboe
parent 222f58ac68
commit 16291561e1
1 changed files with 4 additions and 4 deletions
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8
include/trace/events/wbt.h
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@ -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;