| /* Copyright (C) 1997,1998,2000,2002,2004,2006,2011 |
| Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <grp.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| |
| #include <sysdep.h> |
| #include <sys/syscall.h> |
| #include <bp-checks.h> |
| |
| #include <setxid.h> |
| #include <linux/posix_types.h> |
| #include <kernel-features.h> |
| |
| |
| #ifdef __NR_setgroups32 |
| # if __ASSUME_32BITUIDS == 0 |
| /* This variable is shared with all files that need to check for 32bit |
| uids. */ |
| extern int __libc_missing_32bit_uids; |
| # endif |
| #endif /* __NR_setgroups32 */ |
| |
| /* Set the group set for the current user to GROUPS (N of them). For |
| Linux we must convert the array of groups into the format that the |
| kernel expects. */ |
| int |
| setgroups (size_t n, const gid_t *groups) |
| { |
| #if __ASSUME_32BITUIDS > 0 |
| return INLINE_SETXID_SYSCALL (setgroups32, 2, n, CHECK_N (groups, n)); |
| #else |
| if (n > (size_t) __sysconf (_SC_NGROUPS_MAX)) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| else |
| { |
| size_t i; |
| __kernel_gid_t kernel_groups[n]; |
| |
| # ifdef __NR_setgroups32 |
| if (__libc_missing_32bit_uids <= 0) |
| { |
| int result; |
| int saved_errno = errno; |
| |
| result = INLINE_SETXID_SYSCALL (setgroups32, 2, n, |
| CHECK_N (groups, n)); |
| if (result == 0 || errno != ENOSYS) |
| return result; |
| |
| __set_errno (saved_errno); |
| __libc_missing_32bit_uids = 1; |
| } |
| # endif /* __NR_setgroups32 */ |
| for (i = 0; i < n; i++) |
| { |
| kernel_groups[i] = (__ptrvalue (groups))[i]; |
| if (groups[i] != (gid_t) ((__kernel_gid_t) groups[i])) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| } |
| |
| return INLINE_SETXID_SYSCALL (setgroups, 2, n, |
| CHECK_N (kernel_groups, n)); |
| } |
| #endif |
| } |
| libc_hidden_def (setgroups) |