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strscpy: reject buffer sizes larger than INT_MAX

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As already done for snprintf(), add a check in strscpy() for giant (i.e.
likely negative and/or miscalculated) copy sizes, WARN, and error out.

Link: http://lkml.kernel.org/r/201907260928.23DE35406@keescook
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Joe Perches <joe@perches.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Yann Droneaud <ydroneaud@opteya.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Jann Horn <jannh@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kees Cook 2019-09-25 16:46:20 -07:00 committed by Linus Torvalds
parent d1a445d3b8
commit 9a15646614
1 changed files with 1 additions and 1 deletions
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lib/string.c
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@ -183,7 +183,7 @@ ssize_t strscpy(char *dest, const char *src, size_t count)
size_t max = count;
long res = 0;
if (count == 0)
if (count == 0 || WARN_ON_ONCE(count > INT_MAX))
return -E2BIG;
#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS