/usr.bin/procstat/procstat_auxv.c

  1/*-
  2 * Copyright (c) 2011 Mikolaj Golub
  3 * All rights reserved.
  4 *
  5 * Redistribution and use in source and binary forms, with or without
  6 * modification, are permitted provided that the following conditions
  7 * are met:
  8 * 1. Redistributions of source code must retain the above copyright
  9 *    notice, this list of conditions and the following disclaimer.
 10 * 2. Redistributions in binary form must reproduce the above copyright
 11 *    notice, this list of conditions and the following disclaimer in the
 12 *    documentation and/or other materials provided with the distribution.
 13 *
 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 24 * SUCH DAMAGE.
 25 *
 26 * $FreeBSD$
 27 */
 28
 29#include <sys/param.h>
 30#include <sys/elf.h>
 31#include <sys/sysctl.h>
 32#include <sys/user.h>
 33
 34#include <vm/vm.h>
 35
 36#include <err.h>
 37#include <errno.h>
 38#include <libprocstat.h>
 39#include <limits.h>
 40#include <stdio.h>
 41#include <stdlib.h>
 42#include <string.h>
 43
 44#include "procstat.h"
 45
 46#define PROC_AUXV_MAX	256
 47
 48static Elf_Auxinfo auxv[PROC_AUXV_MAX];
 49static char prefix[256];
 50
 51#if __ELF_WORD_SIZE == 64
 52static Elf32_Auxinfo auxv32[PROC_AUXV_MAX];
 53
 54static const char *elf32_sv_names[] = {
 55	"Linux ELF32",
 56	"FreeBSD ELF32",
 57};
 58
 59static int
 60is_elf32(pid_t pid)
 61{
 62	int error, name[4];
 63	size_t len, i;
 64	static char sv_name[256];
 65
 66	name[0] = CTL_KERN;
 67	name[1] = KERN_PROC;
 68	name[2] = KERN_PROC_SV_NAME;
 69	name[3] = pid;
 70	len = sizeof(sv_name);
 71	error = sysctl(name, 4, sv_name, &len, NULL, 0);
 72	if (error != 0 || len == 0)
 73		return (0);
 74	for (i = 0; i < sizeof(elf32_sv_names) / sizeof(*elf32_sv_names); i++) {
 75		if (strncmp(sv_name, elf32_sv_names[i], sizeof(sv_name)) == 0)
 76			return (1);
 77	}
 78	return (0);
 79}
 80
 81static size_t
 82retrieve_auxv32(pid_t pid)
 83{
 84	int name[4];
 85	size_t len, i;
 86	void *ptr;
 87
 88	name[0] = CTL_KERN;
 89	name[1] = KERN_PROC;
 90	name[2] = KERN_PROC_AUXV;
 91	name[3] = pid;
 92	len = sizeof(auxv32);
 93	if (sysctl(name, 4, auxv32, &len, NULL, 0) == -1) {
 94		if (errno != ESRCH && errno != EPERM)
 95			warn("sysctl: kern.proc.auxv: %d: %d", pid, errno);
 96		return (0);
 97	}
 98	for (i = 0; i < len; i++) {
 99		/*
100		 * XXX: We expect that values for a_type on a 32-bit platform
101		 * are directly mapped to those on 64-bit one, which is not
102		 * necessarily true.
103		 */
104		auxv[i].a_type = auxv32[i].a_type;
105		ptr = &auxv32[i].a_un;
106		auxv[i].a_un.a_val = *((uint32_t *)ptr);
107	}
108	return (len);
109}
110#endif /* __ELF_WORD_SIZE == 64 */
111
112#define	PRINT(name, spec, val)		\
113	printf("%s %-16s " #spec "\n", prefix, #name, (val))
114#define	PRINT_UNKNOWN(type, val)	\
115	printf("%s %16ld %#lx\n", prefix, (long)type, (u_long)(val))
116
117static size_t
118retrieve_auxv(pid_t pid)
119{
120	int name[4];
121	size_t len;
122
123#if __ELF_WORD_SIZE == 64
124	if (is_elf32(pid))
125		return (retrieve_auxv32(pid));
126#endif
127	name[0] = CTL_KERN;
128	name[1] = KERN_PROC;
129	name[2] = KERN_PROC_AUXV;
130	name[3] = pid;
131	len = sizeof(auxv);
132	if (sysctl(name, 4, auxv, &len, NULL, 0) == -1) {
133		if (errno != ESRCH && errno != EPERM)
134			warn("sysctl: kern.proc.auxv: %d: %d", pid, errno);
135		return (0);
136	}
137	return (len);
138}
139
140void
141procstat_auxv(struct kinfo_proc *kipp)
142{
143	size_t len, i;
144
145	if (!hflag)
146		printf("%5s %-16s %-16s %-16s\n", "PID", "COMM", "AUXV", "VALUE");
147	len = retrieve_auxv(kipp->ki_pid);
148	if (len == 0)
149		return;
150	snprintf(prefix, sizeof(prefix), "%5d %-16s", kipp->ki_pid,
151	    kipp->ki_comm);
152	for (i = 0; i < len; i++) {
153		switch(auxv[i].a_type) {
154		case AT_NULL:
155			return;
156		case AT_IGNORE:
157			break;
158		case AT_EXECFD:
159			PRINT(AT_EXECFD, %ld, (long)auxv[i].a_un.a_val);
160			break;
161		case AT_PHDR:
162			PRINT(AT_PHDR, %p, auxv[i].a_un.a_ptr);
163			break;
164		case AT_PHENT:
165			PRINT(AT_PHENT, %ld, (long)auxv[i].a_un.a_val);
166			break;
167		case AT_PHNUM:
168			PRINT(AT_PHNUM, %ld, (long)auxv[i].a_un.a_val);
169			break;
170		case AT_PAGESZ:
171			PRINT(AT_PAGESZ, %ld, (long)auxv[i].a_un.a_val);
172			break;
173		case AT_BASE:
174			PRINT(AT_BASE, %p, auxv[i].a_un.a_ptr);
175			break;
176		case AT_FLAGS:
177			PRINT(AT_FLAGS, %#lx, (u_long)auxv[i].a_un.a_val);
178			break;
179		case AT_ENTRY:
180			PRINT(AT_ENTRY, %p, auxv[i].a_un.a_ptr);
181			break;
182#ifdef AT_NOTELF
183		case AT_NOTELF:
184			PRINT(AT_NOTELF, %ld, (long)auxv[i].a_un.a_val);
185			break;
186#endif
187#ifdef AT_UID
188		case AT_UID:
189			PRINT(AT_UID, %ld, (long)auxv[i].a_un.a_val);
190			break;
191#endif
192#ifdef AT_EUID
193		case AT_EUID:
194			PRINT(AT_EUID, %ld, (long)auxv[i].a_un.a_val);
195			break;
196#endif
197#ifdef AT_GID
198		case AT_GID:
199			PRINT(AT_GID, %ld, (long)auxv[i].a_un.a_val);
200			break;
201#endif
202#ifdef AT_EGID
203		case AT_EGID:
204			PRINT(AT_EGID, %ld, (long)auxv[i].a_un.a_val);
205			break;
206#endif
207		case AT_EXECPATH:
208			PRINT(AT_EXECPATH, %p, auxv[i].a_un.a_ptr);
209			break;
210		case AT_CANARY:
211			PRINT(AT_CANARY, %p, auxv[i].a_un.a_ptr);
212			break;
213		case AT_CANARYLEN:
214			PRINT(AT_CANARYLEN, %ld, (long)auxv[i].a_un.a_val);
215			break;
216		case AT_OSRELDATE:
217			PRINT(AT_OSRELDATE, %ld, (long)auxv[i].a_un.a_val);
218			break;
219		case AT_NCPUS:
220			PRINT(AT_NCPUS, %ld, (long)auxv[i].a_un.a_val);
221			break;
222		case AT_PAGESIZES:
223			PRINT(AT_PAGESIZES, %p, auxv[i].a_un.a_ptr);
224			break;
225		case AT_PAGESIZESLEN:
226			PRINT(AT_PAGESIZESLEN, %ld, (long)auxv[i].a_un.a_val);
227			break;
228		case AT_STACKPROT:
229			if ((auxv[i].a_un.a_val & VM_PROT_EXECUTE) != 0)
230				PRINT(AT_STACKPROT, %s, "NONEXECUTABLE");
231			else
232				PRINT(AT_STACKPROT, %s, "EXECUTABLE");
233			break;
234#ifdef AT_TIMEKEEP
235		case AT_TIMEKEEP:
236			PRINT(AT_TIMEKEEP, %p, auxv[i].a_un.a_ptr);
237			break;
238#endif
239		default:
240			PRINT_UNKNOWN(auxv[i].a_type, auxv[i].a_un.a_val);
241			break;
242		}
243	}
244	printf("\n");
245}
246