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Lines 46-51
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| 46 |
# include <ndir.h> |
46 |
# include <ndir.h> |
| 47 |
# endif |
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# endif |
| 48 |
#endif |
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#endif |
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#if defined(HAVE_LIBPROC_H) |
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# include <libproc.h> |
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#endif |
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52 |
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| 50 |
#ifndef OPEN_MAX |
53 |
#ifndef OPEN_MAX |
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# define OPEN_MAX 256 |
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# define OPEN_MAX 256 |
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Lines 55-75
Link Here
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| 55 |
__unused static const char rcsid[] = "$Sudo: closefrom.c,v 1.11 2006/08/17 15:26:54 millert Exp $"; |
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__unused static const char rcsid[] = "$Sudo: closefrom.c,v 1.11 2006/08/17 15:26:54 millert Exp $"; |
| 56 |
#endif /* lint */ |
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#endif /* lint */ |
| 57 |
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60 |
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61 |
#ifndef HAVE_FCNTL_CLOSEM |
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/* |
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/* |
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* Close all file descriptors greater than or equal to lowfd. |
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* Close all file descriptors greater than or equal to lowfd. |
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*/ |
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*/ |
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static void |
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closefrom_fallback(int lowfd) |
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{ |
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long fd, maxfd; |
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/* |
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* Fall back on sysconf() or getdtablesize(). We avoid checking |
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* resource limits since it is possible to open a file descriptor |
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* and then drop the rlimit such that it is below the open fd. |
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*/ |
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#ifdef HAVE_SYSCONF |
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maxfd = sysconf(_SC_OPEN_MAX); |
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#else |
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maxfd = getdtablesize(); |
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#endif /* HAVE_SYSCONF */ |
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if (maxfd < 0) |
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maxfd = OPEN_MAX; |
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| 83 |
for (fd = lowfd; fd < maxfd; fd++) |
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(void) close((int) fd); |
| 85 |
} |
| 86 |
#endif /* HAVE_FCNTL_CLOSEM */ |
| 87 |
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| 61 |
#ifdef HAVE_FCNTL_CLOSEM |
88 |
#ifdef HAVE_FCNTL_CLOSEM |
| 62 |
void |
89 |
void |
| 63 |
closefrom(int lowfd) |
90 |
closefrom(int lowfd) |
| 64 |
{ |
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{ |
| 65 |
(void) fcntl(lowfd, F_CLOSEM, 0); |
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(void) fcntl(lowfd, F_CLOSEM, 0); |
| 66 |
} |
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} |
| 67 |
#else |
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#elif defined(HAVE_LIBPROC_H) && defined(HAVE_PROC_PIDINFO) |
| 68 |
void |
95 |
void |
| 69 |
closefrom(int lowfd) |
96 |
closefrom(int lowfd) |
| 70 |
{ |
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{ |
| 71 |
long fd, maxfd; |
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int i, r, sz; |
| 72 |
#if defined(HAVE_DIRFD) && defined(HAVE_PROC_PID) |
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pid_t pid = getpid(); |
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100 |
struct proc_fdinfo *fdinfo_buf = NULL; |
| 101 |
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| 102 |
sz = proc_pidinfo(pid, PROC_PIDLISTFDS, 0, NULL, 0); |
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if (sz == 0) |
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return; /* no fds, really? */ |
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else if (sz == -1) |
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goto fallback; |
| 107 |
if ((fdinfo_buf = malloc(sz)) == NULL) |
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goto fallback; |
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r = proc_pidinfo(pid, PROC_PIDLISTFDS, 0, fdinfo_buf, sz); |
| 110 |
if (r < 0 || r >= sz) |
| 111 |
goto fallback; |
| 112 |
for (i = 0; i < sz / (int)PROC_PIDLISTFD_SIZE; i++) { |
| 113 |
if (fdinfo_buf[i].proc_fd >= lowfd) |
| 114 |
close(fdinfo_buf[i].proc_fd); |
| 115 |
} |
| 116 |
free(fdinfo_buf); |
| 117 |
return; |
| 118 |
fallback: |
| 119 |
free(fdinfo_buf); |
| 120 |
closefrom_fallback(lowfd); |
| 121 |
return; |
| 122 |
} |
| 123 |
#elif defined(HAVE_DIRFD) && defined(HAVE_PROC_PID) |
| 124 |
void |
| 125 |
closefrom(int lowfd) |
| 126 |
{ |
| 127 |
long fd; |
| 73 |
char fdpath[PATH_MAX], *endp; |
128 |
char fdpath[PATH_MAX], *endp; |
| 74 |
struct dirent *dent; |
129 |
struct dirent *dent; |
| 75 |
DIR *dirp; |
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DIR *dirp; |
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Lines 85-109
closefrom(int lowfd)
Link Here
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| 85 |
(void) close((int) fd); |
140 |
(void) close((int) fd); |
| 86 |
} |
141 |
} |
| 87 |
(void) closedir(dirp); |
142 |
(void) closedir(dirp); |
| 88 |
} else |
143 |
return; |
| 89 |
#endif |
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| 90 |
{ |
| 91 |
/* |
| 92 |
* Fall back on sysconf() or getdtablesize(). We avoid checking |
| 93 |
* resource limits since it is possible to open a file descriptor |
| 94 |
* and then drop the rlimit such that it is below the open fd. |
| 95 |
*/ |
| 96 |
#ifdef HAVE_SYSCONF |
| 97 |
maxfd = sysconf(_SC_OPEN_MAX); |
| 98 |
#else |
| 99 |
maxfd = getdtablesize(); |
| 100 |
#endif /* HAVE_SYSCONF */ |
| 101 |
if (maxfd < 0) |
| 102 |
maxfd = OPEN_MAX; |
| 103 |
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| 104 |
for (fd = lowfd; fd < maxfd; fd++) |
| 105 |
(void) close((int) fd); |
| 106 |
} |
144 |
} |
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145 |
/* /proc/$$/fd strategy failed, fall back to brute force closure */ |
| 146 |
closefrom_fallback(lowfd); |
| 147 |
} |
| 148 |
#else |
| 149 |
void |
| 150 |
closefrom(int lowfd) |
| 151 |
{ |
| 152 |
closefrom_fallback(lowfd); |
| 107 |
} |
153 |
} |
| 108 |
#endif /* !HAVE_FCNTL_CLOSEM */ |
154 |
#endif /* !HAVE_FCNTL_CLOSEM */ |
| 109 |
#endif /* HAVE_CLOSEFROM */ |
155 |
#endif /* HAVE_CLOSEFROM */ |