From: "Anthony G. Basile" <bluen...@gentoo.org> issetugid() returns 1 if the process environment or memory address space is considered tainted, and returns 0 otherwise. This happens, for example, when a process's privileges are elevated by the setuid or setgid flags on an executable belonging to root. This function first appeard in OpenBSD 2.0 and is needed for the LibreSSL.
This patch follows the same logic as the equivalent musl commit. For more information see the commit message at http://git.musl-libc.org/cgit/musl/commit/?id=ddddec106fd17c3aca3287005d21e92f742aa9d4 --- include/unistd.h | 8 ++++++++ libc/misc/file/issetugid.c | 12 ++++++++++++ libc/misc/internals/__uClibc_main.c | 12 ++++++++++++ 3 files changed, 32 insertions(+) create mode 100644 libc/misc/file/issetugid.c diff --git a/include/unistd.h b/include/unistd.h index 540062a..6c2c8c2 100644 --- a/include/unistd.h +++ b/include/unistd.h @@ -1168,6 +1168,14 @@ extern long int syscall (long int __sysno, ...) __THROW; #endif /* Use misc. */ +#ifdef __USE_MISC +/* issetugid() returns 1 if the process environment or memory address space + is considered tainted, and returns 0 otherwise. This happens, for example, + when a process's privileges are elevated by the setuid or setgid flags on + an executable belonging to root. +*/ +extern int issetugid(void); +#endif #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both diff --git a/libc/misc/file/issetugid.c b/libc/misc/file/issetugid.c new file mode 100644 index 0000000..29a4167 --- /dev/null +++ b/libc/misc/file/issetugid.c @@ -0,0 +1,12 @@ +/* Copyright (C) 2013 Gentoo Foundation + * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + */ + +#include <unistd.h> + +extern int _pe_secure; + +int issetugid(void) +{ + return _pe_secure; +} diff --git a/libc/misc/internals/__uClibc_main.c b/libc/misc/internals/__uClibc_main.c index a37751f..b062e62 100644 --- a/libc/misc/internals/__uClibc_main.c +++ b/libc/misc/internals/__uClibc_main.c @@ -40,6 +40,13 @@ #include <locale.h> #endif +/* Are we in a secure process environment or are we dealing + * with setuid stuff? If we are dynamically linked, then we + * already have _dl_secure, otherwise we need to re-examine + * auxvt[]. + */ +int _pe_secure = 1; + #ifndef SHARED void *__libc_stack_end = NULL; @@ -387,6 +394,11 @@ void __uClibc_main(int (*main)(int, char **, char **), int argc, #else if (_dl_secure) #endif + _pe_secure = 1 ; + else + _pe_secure = 0 ; + + if (_pe_secure) { __check_one_fd (STDIN_FILENO, O_RDONLY | O_NOFOLLOW); __check_one_fd (STDOUT_FILENO, O_RDWR | O_NOFOLLOW); -- 1.8.5.5 _______________________________________________ uClibc mailing list uClibc@uclibc.org http://lists.busybox.net/mailman/listinfo/uclibc
