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Red Hat Bugzilla – Attachment 312392 Details for
Bug 456282
CVE-2008-4307 Kernel BUG() in locks_remove_flock
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Lock a file with fcntl/POSIX locking.
lockit.c (text/plain), 750 bytes, created by
Bryn M. Reeves
on 2008-07-22 20:27:31 UTC
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Description:
Lock a file with fcntl/POSIX locking.
Filename:
MIME Type:
Creator:
Bryn M. Reeves
Created:
2008-07-22 20:27:31 UTC
Size:
750 bytes
patch
obsolete
>#include <unistd.h> >#include <stdlib.h> >#include <stdio.h> >#include <sys/types.h> >#include <sys/stat.h> >#include <fcntl.h> >#include <pthread.h> > >/** > * Just POSIX lock a file and pause forever > * > * argv[1] - file system path to lock > */ >int main(int argc, char **argv) >{ > struct flock fl; > int fd; > > if (argc < 2) { > fprintf(stderr, "usage:\n%s <path>\n", argv[0]); > exit(1); > } > > fd = open(argv[1], O_RDWR); > if (fd < 0) { > perror("open"); > exit(1); > } > > fl.l_type = F_WRLCK; > fl.l_whence = SEEK_SET; > fl.l_start = 0; /* may as well lock it all */ > fl.l_len = 0; > > if(fcntl(fd, F_SETLKW, &fl) == -1) { > perror("fcntl"); > fprintf(stderr, "%s (%d) does not hold the lock - exiting\n", > argv[0], getpid()); > exit(1); > } > pause(); > exit(0); >}
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