Annotation of sys/miscfs/procfs/procfs_cmdline.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: procfs_cmdline.c,v 1.8 2007/06/18 08:30:07 jasper Exp $ */
2: /* $NetBSD: procfs_cmdline.c,v 1.3 1999/03/13 22:26:48 thorpej Exp $ */
3:
4: /*
5: * Copyright (c) 1999 Jaromir Dolecek <dolecek@ics.muni.cz>
6: * Copyright (c) 1999 The NetBSD Foundation, Inc.
7: * All rights reserved.
8: *
9: * This code is derived from software contributed to The NetBSD Foundation
10: * by Jaromir Dolecek.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. All advertising materials mentioning features or use of this software
21: * must display the following acknowledgement:
22: * This product includes software developed by the NetBSD
23: * Foundation, Inc. and its contributors.
24: * 4. Neither the name of The NetBSD Foundation nor the names of its
25: * contributors may be used to endorse or promote products derived
26: * from this software without specific prior written permission.
27: *
28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38: * POSSIBILITY OF SUCH DAMAGE.
39: */
40:
41: #include <sys/param.h>
42: #include <sys/types.h>
43: #include <sys/systm.h>
44: #include <sys/syslimits.h>
45: #include <sys/proc.h>
46: #include <sys/vnode.h>
47: #include <sys/exec.h>
48: #include <sys/malloc.h>
49: #include <miscfs/procfs/procfs.h>
50: #include <uvm/uvm_extern.h>
51:
52: /*
53: * code for returning process's command line arguments
54: */
55: int
56: procfs_docmdline(struct proc *curp, struct proc *p, struct pfsnode *pfs, struct uio *uio)
57: {
58: struct ps_strings pss;
59: int count, error, i;
60: size_t len, xlen, upper_bound;
61: struct uio auio;
62: struct iovec aiov;
63: vaddr_t argv;
64: char *arg;
65:
66: /* Don't allow writing. */
67: if (uio->uio_rw != UIO_READ)
68: return (EOPNOTSUPP);
69:
70: /*
71: * Allocate a temporary buffer to hold the arguments.
72: */
73: arg = malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
74:
75: /*
76: * Zombies don't have a stack, so we can't read their psstrings.
77: * System processes also don't have a user stack. This is what
78: * ps(1) would display.
79: */
80: if (P_ZOMBIE(p) || (p->p_flag & P_SYSTEM) != 0) {
81: len = snprintf(arg, PAGE_SIZE, "(%s)", p->p_comm);
82: if (uio->uio_offset >= (off_t)len)
83: error = 0;
84: else
85: error = uiomove(arg, len - uio->uio_offset, uio);
86:
87: free(arg, M_TEMP);
88: return (error);
89: }
90:
91: /*
92: * NOTE: Don't bother doing a process_checkioperm() here
93: * because the psstrings info is available by using ps(1),
94: * so it's not like there's anything to protect here.
95: */
96:
97: /*
98: * Lock the process down in memory.
99: */
100: /* XXXCDC: how should locking work here? */
101: if ((p->p_flag & P_WEXIT) || (p->p_vmspace->vm_refcnt < 1)) {
102: free(arg, M_TEMP);
103: return (EFAULT);
104: }
105: p->p_vmspace->vm_refcnt++; /* XXX */
106:
107: /*
108: * Read in the ps_strings structure.
109: */
110: aiov.iov_base = &pss;
111: aiov.iov_len = sizeof(pss);
112: auio.uio_iov = &aiov;
113: auio.uio_iovcnt = 1;
114: auio.uio_offset = (vaddr_t)PS_STRINGS;
115: auio.uio_resid = sizeof(pss);
116: auio.uio_segflg = UIO_SYSSPACE;
117: auio.uio_rw = UIO_READ;
118: auio.uio_procp = NULL;
119: error = uvm_io(&p->p_vmspace->vm_map, &auio, 0);
120: if (error)
121: goto bad;
122:
123: /*
124: * Now read the address of the argument vector.
125: */
126: aiov.iov_base = &argv;
127: aiov.iov_len = sizeof(argv);
128: auio.uio_iov = &aiov;
129: auio.uio_iovcnt = 1;
130: auio.uio_offset = (vaddr_t)pss.ps_argvstr;
131: auio.uio_resid = sizeof(argv);
132: auio.uio_segflg = UIO_SYSSPACE;
133: auio.uio_rw = UIO_READ;
134: auio.uio_procp = NULL;
135: error = uvm_io(&p->p_vmspace->vm_map, &auio, 0);
136: if (error)
137: goto bad;
138:
139: /*
140: * Now copy in the actual argument vector, one byte at a time,
141: * since we don't know how long the vector is (though, we do
142: * know how many NUL-terminated strings are in the vector).
143: */
144: len = 0;
145: count = pss.ps_nargvstr;
146: upper_bound = round_page(uio->uio_offset + uio->uio_resid);
147: for (; count && len < upper_bound; len += xlen) {
148: aiov.iov_base = arg;
149: aiov.iov_len = PAGE_SIZE;
150: auio.uio_iov = &aiov;
151: auio.uio_iovcnt = 1;
152: auio.uio_offset = argv + len;
153: xlen = PAGE_SIZE - ((argv + len) & PAGE_MASK);
154: auio.uio_resid = xlen;
155: auio.uio_segflg = UIO_SYSSPACE;
156: auio.uio_rw = UIO_READ;
157: auio.uio_procp = NULL;
158: error = uvm_io(&p->p_vmspace->vm_map, &auio, 0);
159: if (error)
160: goto bad;
161:
162: for (i = 0; i < xlen && count != 0; i++) {
163: if (arg[i] == '\0')
164: count--; /* one full string */
165: }
166:
167: if (count == 0)
168: i--; /* exclude the final NUL */
169:
170: if (len + i > uio->uio_offset) {
171: /* Have data in this page, copy it out */
172: error = uiomove(arg + uio->uio_offset - len,
173: i + len - uio->uio_offset, uio);
174: if (error || uio->uio_resid <= 0)
175: break;
176: }
177: }
178:
179:
180: bad:
181: uvmspace_free(p->p_vmspace);
182: free(arg, M_TEMP);
183: return (error);
184: }
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