Taylor R Campbell 99548cd16e Avoid undefined behaviour with the <ctype.h> functions. ... fix https://github.com/openssl/openssl/issues/25112 As defined in the C standard: In all cases the argument is an int, the value of which shall be representable as an unsigned char or shall equal the value of the macro EOF. If the argument has any other value, the behavior is undefined. This is because they're designed to work with the int values returned by getc or fgetc; they need extra work to handle a char value. If EOF is -1 (as it almost always is), with 8-bit bytes, the allowed inputs to the ctype.h functions are: {-1, 0, 1, 2, 3, ..., 255}. However, on platforms where char is signed, such as x86 with the usual ABI, code like char *p = ...; ... isspace(*p) ... may pass in values in the range: {-128, -127, -126, ..., -2, -1, 0, 1, ..., 127}. This has two problems: 1. Inputs in the set {-128, -127, -126, ..., -2} are forbidden. 2. The non-EOF byte 0xff is conflated with the value EOF = -1, so even though the input is not forbidden, it may give the wrong answer. Casting char inputs to unsigned char first works around this, by mapping the (non-EOF character) range {-128, -127, ..., -1} to {128, 129, ..., 255}, leaving no collisions with EOF. So the above fragment needs to be: char *p = ...; ... isspace((unsigned char)*p) ... This patch inserts unsigned char casts where necessary. Most of the cases I changed, I compile-tested using -Wchar-subscripts -Werror on NetBSD, which defines the ctype.h functions as macros so that they trigger the warning when the argument has type char. The exceptions are under #ifdef __VMS or #ifdef _WIN32. I left alone calls where the input is int where the cast would obviously be wrong; and I left alone calls where the input is already unsigned char so the cast is unnecessary. Reviewed-by: Neil Horman <nhorman@openssl.org> Reviewed-by: Kurt Roeckx <kurt@roeckx.be> Reviewed-by: Paul Dale <ppzgs1@gmail.com> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/25113)		2024-10-10 20:47:48 +02:00
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asm
build.info
e_afalg_err.c
e_afalg_err.h
e_afalg.c	Prefer ARRAY_SIZE(...)	2024-07-22 06:55:35 -04:00
e_afalg.ec
e_afalg.h
e_afalg.txt
e_capi_err.c
e_capi_err.h
e_capi.c
e_capi.ec
e_capi.txt
e_dasync_err.c
e_dasync_err.h
e_dasync.c	Copyright year updates	2024-04-09 13:43:26 +02:00
e_dasync.ec
e_dasync.txt
e_devcrypto.c	Remove uneeded cast to unsigned int	2023-12-22 14:43:31 +01:00
e_loader_attic_err.c
e_loader_attic_err.h
e_loader_attic.c	Avoid undefined behaviour with the <ctype.h> functions.	2024-10-10 20:47:48 +02:00
e_loader_attic.ec
e_loader_attic.txt
e_ossltest_err.c
e_ossltest_err.h
e_ossltest.c
e_ossltest.ec
e_ossltest.txt
e_padlock.c