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81 lines
3.2 KiB
Diff
81 lines
3.2 KiB
Diff
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commit 7532837d7b03b3ca5b9a63d77a5bd81dd23f3d9c
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Author: Martin Sebor <msebor@redhat.com>
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Date: Wed Nov 15 17:39:59 2017 -0700
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The -Wstringop-truncation option new in GCC 8 detects common misuses
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of the strncat and strncpy function that may result in truncating
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the copied string before the terminating NUL. To avoid false positive
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warnings for correct code that intentionally creates sequences of
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characters that aren't guaranteed to be NUL-terminated, arrays that
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are intended to store such sequences should be decorated with a new
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nonstring attribute. This change add this attribute to Glibc and
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uses it to suppress such false positives.
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ChangeLog:
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* misc/sys/cdefs.h (__attribute_nonstring__): New macro.
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* sysdeps/gnu/bits/utmp.h (struct utmp): Use it.
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* sysdeps/unix/sysv/linux/s390/bits/utmp.h (struct utmp): Same.
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---
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misc/sys/cdefs.h | 9 +++++++++
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sysdeps/gnu/bits/utmp.h | 9 ++++++---
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sysdeps/unix/sysv/linux/s390/bits/utmp.h | 9 ++++++---
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3 files changed, 21 insertions(+), 6 deletions(-)
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--- a/misc/sys/cdefs.h
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+++ b/misc/sys/cdefs.h
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@@ -375,6 +375,15 @@
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# define __glibc_unlikely(cond) (cond)
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#endif
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+#if __GNUC_PREREQ (8, 0)
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+/* Describes a char array whose address can safely be passed as the first
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+ argument to strncpy and strncat, as the char array is not necessarily
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+ a NUL-terminated string. */
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+# define __attribute_nonstring__ __attribute__ ((__nonstring__))
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+#else
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+# define __attribute_nonstring__
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+#endif
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+
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#include <bits/wordsize.h>
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#if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
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--- a/sysdeps/gnu/bits/utmp.h
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+++ b/sysdeps/gnu/bits/utmp.h
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@@ -59,10 +59,13 @@
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{
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short int ut_type; /* Type of login. */
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pid_t ut_pid; /* Process ID of login process. */
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- char ut_line[UT_LINESIZE]; /* Devicename. */
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+ char ut_line[UT_LINESIZE]
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+ __attribute_nonstring__; /* Devicename. */
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char ut_id[4]; /* Inittab ID. */
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- char ut_user[UT_NAMESIZE]; /* Username. */
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- char ut_host[UT_HOSTSIZE]; /* Hostname for remote login. */
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+ char ut_user[UT_NAMESIZE]
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+ __attribute_nonstring__; /* Username. */
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+ char ut_host[UT_HOSTSIZE]
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+ __attribute_nonstring__; /* Hostname for remote login. */
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struct exit_status ut_exit; /* Exit status of a process marked
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as DEAD_PROCESS. */
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/* The ut_session and ut_tv fields must be the same size when compiled
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--- a/sysdeps/unix/sysv/linux/s390/bits/utmp.h
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+++ b/sysdeps/unix/sysv/linux/s390/bits/utmp.h
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@@ -60,10 +60,13 @@
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{
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short int ut_type; /* Type of login. */
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pid_t ut_pid; /* Process ID of login process. */
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- char ut_line[UT_LINESIZE]; /* Devicename. */
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+ char ut_line[UT_LINESIZE]
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+ __attribute_nonstring__; /* Devicename. */
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char ut_id[4]; /* Inittab ID. */
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- char ut_user[UT_NAMESIZE]; /* Username. */
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- char ut_host[UT_HOSTSIZE]; /* Hostname for remote login. */
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+ char ut_user[UT_NAMESIZE]
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+ __attribute_nonstring__; /* Username. */
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+ char ut_host[UT_HOSTSIZE]
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+ __attribute_nonstring__; /* Hostname for remote login. */
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struct exit_status ut_exit; /* Exit status of a process marked
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as DEAD_PROCESS. */
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/* The ut_session and ut_tv fields must be the same size when compiled
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