This is a note to let you know that I've just added the patch titled
fortify: Do not cast to "unsigned char"
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fortify-do-not-cast-to-unsigned-char.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6298d83cd0e56f0846db36f0c13ce37c59700073
Author: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Tue Oct 25 16:05:18 2022 -0700
fortify: Do not cast to "unsigned char"
[ Upstream commit e9a40e1585d792751d3a122392695e5a53032809 ]
Do not cast to "unsigned char", as this needlessly creates type problems
when attempting builds without -Wno-pointer-sign[1]. The intent of the
cast is to drop possible "const" types.
[1] https://lore.kernel.org/lkml/CAHk-=wgz3Uba8w7kdXhsqR1qvfemYL+OFQdefJnkeqXG8qZ_pA@xxxxxxxxxxxxxx/
Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Fixes: 3009f891bb9f ("fortify: Allow strlen() and strnlen() to pass compile-time known lengths")
Cc: linux-hardening@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h
index ae076aae9e66..c26160fe2e34 100644
--- a/include/linux/fortify-string.h
+++ b/include/linux/fortify-string.h
@@ -17,7 +17,7 @@ void __write_overflow_field(size_t avail, size_t wanted) __compiletime_warning("
#define __compiletime_strlen(p) \
({ \
- unsigned char *__p = (unsigned char *)(p); \
+ char *__p = (char *)(p); \
size_t __ret = SIZE_MAX; \
size_t __p_size = __builtin_object_size(p, 1); \
if (__p_size != SIZE_MAX && \
