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https://sourceware.org/git/glibc.git
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0ad926f349
nptl has
/* Opcodes and data types for communication with the signal handler to
change user/group IDs. */
struct xid_command
{
int syscall_no;
long int id[3];
volatile int cntr;
volatile int error;
};
/* This must be last, otherwise the current thread might not have
permissions to send SIGSETXID syscall to the other threads. */
result = INTERNAL_SYSCALL_NCS (cmdp->syscall_no, 3,
cmdp->id[0], cmdp->id[1], cmdp->id[2]);
But the second argument of setgroups syscal is a pointer:
int setgroups (size_t size, const gid_t *list);
But on x32, pointers passed to syscall must have pointer type so that
they will be zero-extended. The kernel XID arguments are unsigned and
do not require sign extension. Change xid_command to
struct xid_command
{
int syscall_no;
unsigned long int id[3];
volatile int cntr;
volatile int error;
};
so that all arguments are zero-extended. A testcase is added for x32 and
setgroups returned with EFAULT when running as root without the fix.
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/* Test setgroups as root and in the presence of threads (Bug 26248)
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <limits.h>
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#include <grp.h>
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#include <errno.h>
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#include <error.h>
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#include <support/xthread.h>
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#include <support/support.h>
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#include <support/test-driver.h>
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#include <support/xunistd.h>
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/* The purpose of this test is to test the setgroups API as root and in
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the presence of threads. Once we create a thread the setgroups
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implementation must ensure that all threads are set to the same
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group and this operation should not fail. Lastly we test setgroups
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with a zero sized group and a bad address and verify we get EPERM. */
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static void *
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start_routine (void *args)
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{
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return NULL;
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}
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static int
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do_test (void)
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{
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int size;
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/* NB: Stack address can be at 0xfffXXXXX on 32-bit OSes. */
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gid_t list[NGROUPS_MAX];
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int status = EXIT_SUCCESS;
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pthread_t thread = xpthread_create (NULL, start_routine, NULL);
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size = getgroups (sizeof (list) / sizeof (list[0]), list);
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if (size < 0)
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{
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status = EXIT_FAILURE;
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error (0, errno, "getgroups failed");
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}
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if (setgroups (size, list) < 0)
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{
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if (errno == EPERM)
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status = EXIT_UNSUPPORTED;
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else
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{
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status = EXIT_FAILURE;
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error (0, errno, "setgroups failed");
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}
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}
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if (status == EXIT_SUCCESS && setgroups (0, list) < 0)
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{
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status = EXIT_FAILURE;
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error (0, errno, "setgroups failed");
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}
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xpthread_join (thread);
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return status;
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}
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#include <support/test-driver.c>
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