lib/string: Add strscpy_pad() function

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We have a function to copy strings safely and we have a function to copy
strings and zero the tail of the destination (if source string is
shorter than destination buffer) but we do not have a function to do
both at once.  This means developers must write this themselves if they
desire this functionality.  This is a chore, and also leaves us open to
off by one errors unnecessarily.

Add a function that calls strscpy() then memset()s the tail to zero if
the source string is shorter than the destination buffer.

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Shuah Khan <shuah@kernel.org>

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Tobin C. Harding 2019-04-05 12:58:58 +11:00 • committed by Shuah Khan

parent 6b1a4d5b1a

commit 458a3bf82d

2 changed files with 44 additions and 7 deletions

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4

include/linux/string.h

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47

lib/string.c

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