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kyber: 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/20230703172159.3668349-2-azeemshaikh38@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Azeem Shaikh 2023-07-03 17:21:58 +00:00 committed by Jens Axboe
parent fdf0eaf114
commit 222f58ac68
1 changed files with 4 additions and 4 deletions
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8
include/trace/events/kyber.h
View file

@ -31,8 +31,8 @@ TRACE_EVENT(kyber_latency,
TP_fast_assign(
__entry->dev = dev;
strlcpy(__entry->domain, domain, sizeof(__entry->domain));
strlcpy(__entry->type, type, sizeof(__entry->type));
strscpy(__entry->domain, domain, sizeof(__entry->domain));
strscpy(__entry->type, type, sizeof(__entry->type));
__entry->percentile = percentile;
__entry->numerator = numerator;
__entry->denominator = denominator;
@ -59,7 +59,7 @@ TRACE_EVENT(kyber_adjust,
TP_fast_assign(
__entry->dev = dev;
strlcpy(__entry->domain, domain, sizeof(__entry->domain));
strscpy(__entry->domain, domain, sizeof(__entry->domain));
__entry->depth = depth;
),
@ -81,7 +81,7 @@ TRACE_EVENT(kyber_throttled,
TP_fast_assign(
__entry->dev = dev;
strlcpy(__entry->domain, domain, sizeof(__entry->domain));
strscpy(__entry->domain, domain, sizeof(__entry->domain));
),
TP_printk("%d,%d %s", MAJOR(__entry->dev), MINOR(__entry->dev),