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* [glibc] string: Enable __FORTIFY_LEVEL=3
@ 2020-12-31 11:27 Siddhesh Poyarekar
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From: Siddhesh Poyarekar @ 2020-12-31 11:27 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2a3224c53653214cbba2ec23424702193c80ea3b
commit 2a3224c53653214cbba2ec23424702193c80ea3b
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Wed Dec 30 11:09:58 2020 +0530
string: Enable __FORTIFY_LEVEL=3
This change enhances fortified string functions to use
__builtin_dynamic_object_size under _FORTIFY_SOURCE=3 whenever the
compiler supports it.
Diff:
---
include/string.h | 5 +++--
string/bits/string_fortified.h | 29 ++++++++++++++++++-----------
string/bits/strings_fortified.h | 6 ++++--
3 files changed, 25 insertions(+), 15 deletions(-)
diff --git a/include/string.h b/include/string.h
index 7d344d77d4..81dab39891 100644
--- a/include/string.h
+++ b/include/string.h
@@ -123,10 +123,11 @@ libc_hidden_proto (__strerror_l)
void __explicit_bzero_chk_internal (void *, size_t, size_t)
__THROW __nonnull ((1)) attribute_hidden;
# define explicit_bzero(buf, len) \
- __explicit_bzero_chk_internal (buf, len, __bos0 (buf))
+ __explicit_bzero_chk_internal (buf, len, __glibc_objsize0 (buf))
#elif !IS_IN (nonlib)
void __explicit_bzero_chk (void *, size_t, size_t) __THROW __nonnull ((1));
-# define explicit_bzero(buf, len) __explicit_bzero_chk (buf, len, __bos0 (buf))
+# define explicit_bzero(buf, len) __explicit_bzero_chk (buf, len, \
+ __glibc_objsize0 (buf))
#endif
libc_hidden_builtin_proto (memchr)
diff --git a/string/bits/string_fortified.h b/string/bits/string_fortified.h
index 4c1aeb45f1..92d75f10fa 100644
--- a/string/bits/string_fortified.h
+++ b/string/bits/string_fortified.h
@@ -26,13 +26,15 @@ __fortify_function void *
__NTH (memcpy (void *__restrict __dest, const void *__restrict __src,
size_t __len))
{
- return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
+ return __builtin___memcpy_chk (__dest, __src, __len,
+ __glibc_objsize0 (__dest));
}
__fortify_function void *
__NTH (memmove (void *__dest, const void *__src, size_t __len))
{
- return __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
+ return __builtin___memmove_chk (__dest, __src, __len,
+ __glibc_objsize0 (__dest));
}
#ifdef __USE_GNU
@@ -40,7 +42,8 @@ __fortify_function void *
__NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
size_t __len))
{
- return __builtin___mempcpy_chk (__dest, __src, __len, __bos0 (__dest));
+ return __builtin___mempcpy_chk (__dest, __src, __len,
+ __glibc_objsize0 (__dest));
}
#endif
@@ -53,7 +56,8 @@ __NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
__fortify_function void *
__NTH (memset (void *__dest, int __ch, size_t __len))
{
- return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
+ return __builtin___memset_chk (__dest, __ch, __len,
+ __glibc_objsize0 (__dest));
}
#ifdef __USE_MISC
@@ -65,21 +69,21 @@ void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
__fortify_function void
__NTH (explicit_bzero (void *__dest, size_t __len))
{
- __explicit_bzero_chk (__dest, __len, __bos0 (__dest));
+ __explicit_bzero_chk (__dest, __len, __glibc_objsize0 (__dest));
}
#endif
__fortify_function char *
__NTH (strcpy (char *__restrict __dest, const char *__restrict __src))
{
- return __builtin___strcpy_chk (__dest, __src, __bos (__dest));
+ return __builtin___strcpy_chk (__dest, __src, __glibc_objsize (__dest));
}
#ifdef __USE_GNU
__fortify_function char *
__NTH (stpcpy (char *__restrict __dest, const char *__restrict __src))
{
- return __builtin___stpcpy_chk (__dest, __src, __bos (__dest));
+ return __builtin___stpcpy_chk (__dest, __src, __glibc_objsize (__dest));
}
#endif
@@ -88,14 +92,16 @@ __fortify_function char *
__NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
size_t __len))
{
- return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
+ return __builtin___strncpy_chk (__dest, __src, __len,
+ __glibc_objsize (__dest));
}
#if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
__fortify_function char *
__NTH (stpncpy (char *__dest, const char *__src, size_t __n))
{
- return __builtin___stpncpy_chk (__dest, __src, __n, __bos (__dest));
+ return __builtin___stpncpy_chk (__dest, __src, __n,
+ __glibc_objsize (__dest));
}
#else
extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
@@ -118,7 +124,7 @@ __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
__fortify_function char *
__NTH (strcat (char *__restrict __dest, const char *__restrict __src))
{
- return __builtin___strcat_chk (__dest, __src, __bos (__dest));
+ return __builtin___strcat_chk (__dest, __src, __glibc_objsize (__dest));
}
@@ -126,7 +132,8 @@ __fortify_function char *
__NTH (strncat (char *__restrict __dest, const char *__restrict __src,
size_t __len))
{
- return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
+ return __builtin___strncat_chk (__dest, __src, __len,
+ __glibc_objsize (__dest));
}
#endif /* bits/string_fortified.h */
diff --git a/string/bits/strings_fortified.h b/string/bits/strings_fortified.h
index d4091f4f69..7752faf4e3 100644
--- a/string/bits/strings_fortified.h
+++ b/string/bits/strings_fortified.h
@@ -22,13 +22,15 @@
__fortify_function void
__NTH (bcopy (const void *__src, void *__dest, size_t __len))
{
- (void) __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
+ (void) __builtin___memmove_chk (__dest, __src, __len,
+ __glibc_objsize0 (__dest));
}
__fortify_function void
__NTH (bzero (void *__dest, size_t __len))
{
- (void) __builtin___memset_chk (__dest, '\0', __len, __bos0 (__dest));
+ (void) __builtin___memset_chk (__dest, '\0', __len,
+ __glibc_objsize0 (__dest));
}
#endif
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2020-12-31 11:27 [glibc] string: Enable __FORTIFY_LEVEL=3 Siddhesh Poyarekar
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