Annotation of sys/miscfs/procfs/procfs_cmdline.c, Revision 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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