When getting the program argument or environement string, we previously
assumed that all the strings were stored in a row, separated by NUL chars, at the address pointed bu argv[0] (or envp[0]). This was wrong: if the program changed argvs[0], we still read the first string correctly, but the next strings did contain unexpected data. The fix: read the whole argv (or envp) array, then copy the string one by one, using their addresses in argv (or agrp)
This commit is contained in:
manu
parent
ed679e385b
commit
bdfbd98ac1
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@ -1,4 +1,4 @@
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/* $NetBSD: init_sysctl.c,v 1.83 2006/09/08 20:58:57 elad Exp $ */
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/* $NetBSD: init_sysctl.c,v 1.84 2006/09/10 05:46:02 manu Exp $ */
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/*-
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* Copyright (c) 2003 The NetBSD Foundation, Inc.
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@ -37,7 +37,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: init_sysctl.c,v 1.83 2006/09/08 20:58:57 elad Exp $");
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__KERNEL_RCSID(0, "$NetBSD: init_sysctl.c,v 1.84 2006/09/10 05:46:02 manu Exp $");
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#include "opt_sysv.h"
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#include "opt_multiprocessor.h"
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@ -2334,13 +2334,13 @@ sysctl_kern_proc_args(SYSCTLFN_ARGS)
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{
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struct ps_strings pss;
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struct proc *p;
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size_t len, upper_bound, xlen, i;
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size_t len, i;
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struct uio auio;
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struct iovec aiov;
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vaddr_t argv;
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pid_t pid;
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int nargv, type, error;
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char *arg;
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char **argv = NULL;
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char *tmp;
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struct vmspace *vmspace;
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vaddr_t psstr_addr;
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@ -2468,41 +2468,56 @@ sysctl_kern_proc_args(SYSCTLFN_ARGS)
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return (EINVAL);
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}
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auio.uio_offset = (off_t)(unsigned long)tmp;
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aiov.iov_base = &argv;
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aiov.iov_len = sizeof(argv);
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#ifdef COMPAT_NETBSD32
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if (p->p_flag & P_32)
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len = sizeof(netbsd32_charp) * nargv;
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else
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#endif
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len = sizeof(char *) * nargv;
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argv = malloc(len, M_TEMP, M_WAITOK);
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aiov.iov_base = argv;
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aiov.iov_len = len;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_resid = sizeof(argv);
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auio.uio_offset = (off_t)(unsigned long)tmp;
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auio.uio_resid = len;
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auio.uio_rw = UIO_READ;
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UIO_SETUP_SYSSPACE(&auio);
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error = uvm_io(&vmspace->vm_map, &auio);
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if (error)
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goto done;
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#ifdef COMPAT_NETBSD32
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/*
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* Here we get a 32 bit pointer that has to be converted,
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* otherwise we get garbage in the 32 higher bits
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* Now copy each string.
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*/
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if (p->p_flag & P_32)
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argv = (vaddr_t)NETBSD32PTR64(argv);
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#endif
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len = 0; /* bytes written to user buffer */
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for (i = 0; i < nargv; i++) {
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int finished = 0;
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vaddr_t base;
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size_t xlen;
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int j;
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#ifdef COMPAT_NETBSD32
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if (p->p_flag & P_32) {
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netbsd32_charp *argv32;
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argv32 = (netbsd32_charp *)argv;
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base = (vaddr_t)NETBSD32PTR64(argv32[i]);
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} else
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#endif
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base = (vaddr_t)argv[i];
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while (!finished) {
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xlen = PAGE_SIZE - (base & PAGE_MASK);
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/*
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* Now copy in the actual argument vector, one page at a time,
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* since we don't know how long the vector is (though, we do
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* know how many NUL-terminated strings are in the vector).
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*/
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len = 0;
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upper_bound = *oldlenp;
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for (; nargv != 0 && len < upper_bound; len += xlen) {
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aiov.iov_base = arg;
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aiov.iov_len = PAGE_SIZE;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = argv + len;
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xlen = PAGE_SIZE - ((argv + len) & PAGE_MASK);
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auio.uio_offset = base;
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auio.uio_resid = xlen;
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auio.uio_rw = UIO_READ;
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UIO_SETUP_SYSSPACE(&auio);
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@ -2510,30 +2525,39 @@ sysctl_kern_proc_args(SYSCTLFN_ARGS)
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if (error)
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goto done;
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for (i = 0; i < xlen && nargv != 0; i++) {
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if (arg[i] == '\0')
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nargv--; /* one full string */
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/* Look for the end of the string */
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for (j = 0; j < xlen; j++) {
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if (arg[j] == '\0') {
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xlen = j + 1;
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finished = 1;
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break;
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}
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}
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/*
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* Make sure we don't copyout past the end of the user's
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* buffer.
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*/
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if (len + i > upper_bound)
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i = upper_bound - len;
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/* Check for user buffer overflow */
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if (len + xlen > *oldlenp) {
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finished = 1;
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if (len > *oldlenp)
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xlen = 0;
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else
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xlen = *oldlenp - len;
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}
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error = copyout(arg, (char *)oldp + len, i);
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/* Copyout the page */
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error = copyout(arg, (char *)oldp + len, xlen);
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if (error)
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break;
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goto done;
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if (nargv == 0) {
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len += i;
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break;
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len += xlen;
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base += xlen;
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}
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}
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*oldlenp = len;
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done:
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if (argv != NULL)
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free(argv, M_TEMP);
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uvmspace_free(vmspace);
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free(arg, M_TEMP);
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