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syslog: Improve fortify with clang

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It improve fortify checks for syslog and vsyslog.  The compile
and runtime hecks have similar coverage as with GCC.

The syslog fortify wrapper calls the va_arg version, since clang does
not support __va_arg_pack.

Checked on aarch64, armhf, x86_64, and i686.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella 2024-02-08 15:46:19 -03:00
parent 4289b00d43
commit 471c3c7a47
1 changed files with 12 additions and 2 deletions
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14
misc/bits/syslog.h
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@ -36,6 +36,15 @@ syslog (int __pri, const char *__fmt, ...)
{
__syslog_chk (__pri, __USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pack ());
}
#elif __fortify_use_clang && defined __USE_MISC
__fortify_function_error_function __attribute_overloadable__ void
syslog (int __pri, __fortify_clang_overload_arg (const char *, , __fmt), ...)
{
__gnuc_va_list __fortify_ap;
__builtin_va_start (__fortify_ap, __fmt);
__vsyslog_chk (__pri, __USE_FORTIFY_LEVEL - 1, __fmt, __fortify_ap);
__builtin_va_end (__fortify_ap);
}
#elif !defined __cplusplus
# define syslog(pri, ...) \
__syslog_chk (pri, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
@ -43,8 +52,9 @@ syslog (int __pri, const char *__fmt, ...)
#ifdef __USE_MISC
__fortify_function void
vsyslog (int __pri, const char *__fmt, __gnuc_va_list __ap)
__fortify_function __attribute_overloadable__ void
vsyslog (int __pri, __fortify_clang_overload_arg (const char *, ,__fmt),
__gnuc_va_list __ap)
{
__vsyslog_chk (__pri, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
}