From: Lirong Yuan <yuanzi@google.com>
To: libc-alpha@sourceware.org
Cc: adhemerval.zanella@linaro.org, schwab@linux-m68k.org,
stanshebs@google.com, scw@google.com,
Lirong Yuan <yuanzi@google.com>
Subject: [PATCH v3] locale: align _nl_C_LC_CTYPE_class and _nl_C_LC_CTYPE_class32 arrays to uint16_t and uint32_t respectively
Date: Thu, 1 Apr 2021 12:37:23 -0700 [thread overview]
Message-ID: <20210401193723.1224640-1-yuanzi@google.com> (raw)
steps to reproduce the problem: compile a program that uses ctype functions such as “isspace” for aarch64 with UBSan flag “-fsanitize=undefined” and run it on x86_64 machines with qemu user mode emulation.
observed behavior: UndefinedBehaviorSanitizer reports misaligned-pointer-use in the program.
solution: align the arrays defined in locale/C-ctype.c with correct data types as defined in ctype/ctype.h.
test suite regressions: none.
---
locale/C-ctype.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/locale/C-ctype.c b/locale/C-ctype.c
index bffdbedad0..da2c8cc33c 100644
--- a/locale/C-ctype.c
+++ b/locale/C-ctype.c
@@ -18,6 +18,7 @@
#include "localeinfo.h"
#include <endian.h>
+#include <stdalign.h>
#include <stdint.h>
#include "C-translit.h"
@@ -30,7 +31,7 @@
In the `_nl_C_LC_CTYPE_class' array the value for EOF (== -1)
is set to always return 0 and the conversion arrays return EOF. */
-const char _nl_C_LC_CTYPE_class[768] attribute_hidden =
+alignas(uint16_t) const char _nl_C_LC_CTYPE_class[768] attribute_hidden =
/* 0x80 */ "\000\000" "\000\000" "\000\000" "\000\000" "\000\000" "\000\000"
/* 0x86 */ "\000\000" "\000\000" "\000\000" "\000\000" "\000\000" "\000\000"
/* 0x8c */ "\000\000" "\000\000" "\000\000" "\000\000" "\000\000" "\000\000"
@@ -96,7 +97,7 @@ const char _nl_C_LC_CTYPE_class[768] attribute_hidden =
/* 0xf4 */ "\000\000" "\000\000" "\000\000" "\000\000" "\000\000" "\000\000"
/* 0xfa */ "\000\000" "\000\000" "\000\000" "\000\000" "\000\000" "\000\000"
;
-const char _nl_C_LC_CTYPE_class32[1024] attribute_hidden =
+alignas(uint32_t) const char _nl_C_LC_CTYPE_class32[1024] attribute_hidden =
/* 0x00 */ "\000\000\002\000" "\000\000\002\000" "\000\000\002\000"
/* 0x03 */ "\000\000\002\000" "\000\000\002\000" "\000\000\002\000"
/* 0x06 */ "\000\000\002\000" "\000\000\002\000" "\000\000\002\000"
--
2.31.0.208.g409f899ff0-goog
next reply other threads:[~2021-04-01 19:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 19:37 Lirong Yuan [this message]
2021-05-03 14:33 ` Florian Weimer
2021-05-03 15:08 ` Lirong Yuan
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