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https://git.kernel.org/pub/scm/libs/libcap/libcap.git
synced 2026-01-27 09:54:36 +00:00
12e163ac21
This is more general than just working with -lpthread threads, and addresses the following bug reports: https://bugzilla.kernel.org/show_bug.cgi?id=219174 https://bugzilla.kernel.org/show_bug.cgi?id=218607 https://bugzilla.kernel.org/show_bug.cgi?id=217476 Signed-off-by: Andrew G. Morgan <morgan@kernel.org>
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
#ifndef _DEFAULT_SOURCE
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#define _DEFAULT_SOURCE
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#endif
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#include <errno.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/capability.h>
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#include <sys/psx_syscall.h>
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#include <sys/prctl.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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static void *thread_fork_exit(void *data) {
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usleep(1234);
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pid_t pid = fork();
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long int start = cap_prctl(PR_GET_KEEPCAPS, 0, 0, 0, 0, 0);
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if (start == -1) {
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perror("FAILED: unable to start");
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exit(1);
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}
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if (pid == 0) {
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if (cap_prctlw(PR_SET_KEEPCAPS, !start, 0, 0, 0, 0) != 0) {
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perror("failed to set proc");
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exit(1);
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}
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if (cap_prctlw(PR_GET_KEEPCAPS, 0, 0, 0, 0, 0) == start) {
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perror("failed to have set forked proc");
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exit(1);
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}
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exit(0);
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}
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int res;
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if (waitpid(pid, &res, 0) != pid || res != 0) {
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printf("FAILED: pid=%d wait returned %d and/or error: %d\n",
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pid, res, errno);
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exit(1);
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}
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return NULL;
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}
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int main(int argc, char **argv) {
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int i;
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printf("hello libcap and libpsx ");
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fflush(stdout);
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long int start = cap_prctl(PR_GET_KEEPCAPS, 0, 0, 0, 0, 0);
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if (start == -1) {
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perror("FAILED: to actually start");
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exit(1);
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}
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pthread_t ignored[10];
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for (i = 0; i < 10; i++) {
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pthread_create(&ignored[i], NULL, thread_fork_exit, NULL);
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printf("."); /* because of fork, this may print double */
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fflush(stdout); /* try to limit the above effect */
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if (cap_prctlw(PR_SET_KEEPCAPS, i & 1, 0, 0, 0, 0)) {
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perror("failed to set proc");
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exit(1);
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}
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/*
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* This should validate all threads think the same thing,
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* and none of the fork() calls mess anything up.
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*/
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if (cap_prctlw(PR_GET_KEEPCAPS, 0, 0, 0, 0, 0) != (i & 1)) {
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perror("failed to have set proc");
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exit(1);
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}
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usleep(1000);
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}
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printf(" PASSED\n");
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exit(0);
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}
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