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Use <startup.h> in __libc_init_secure

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Since __libc_init_secure is called before ARCH_SETUP_TLS, it must use
"int $0x80" for system calls in i386 static PIE.  Add startup_getuid,
startup_geteuid, startup_getgid and startup_getegid to <startup.h>.
Update __libc_init_secure to use them.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
H.J. Lu
2021-01-15 06:46:12 -08:00
parent cabc8a2916
commit 22b79ed7f4
3 changed files with 56 additions and 5 deletions
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29
sysdeps/unix/sysv/linux/i386/startup.h
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@ -17,11 +17,12 @@
<https://www.gnu.org/licenses/>. */
#if BUILD_PIE_DEFAULT
# include <abort-instr.h>
/* Can't use "call *%gs:SYSINFO_OFFSET" during statup in static PIE. */
# define I386_USE_SYSENTER 0
# include <sysdep.h>
# include <abort-instr.h>
__attribute__ ((__noreturn__))
static inline void
_startup_fatal (const char *message __attribute__ ((unused)))
@ -31,6 +32,30 @@ _startup_fatal (const char *message __attribute__ ((unused)))
ABORT_INSTRUCTION;
__builtin_unreachable ();
}
static inline uid_t
startup_getuid (void)
{
return (uid_t) INTERNAL_SYSCALL_CALL (getuid32);
}
static inline uid_t
startup_geteuid (void)
{
return (uid_t) INTERNAL_SYSCALL_CALL (geteuid32);
}
static inline gid_t
startup_getgid (void)
{
return (gid_t) INTERNAL_SYSCALL_CALL (getgid32);
}
static inline gid_t
startup_getegid (void)
{
return (gid_t) INTERNAL_SYSCALL_CALL (getegid32);
}
#else
# include_next <startup.h>
#endif