/src/util-linux/libblkid/src/superblocks/swap.c

Source (jump to first uncovered line)
/*
 * Copyright (C) 1999 by Andries Brouwer
 * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
 * Copyright (C) 2001 by Andreas Dilger
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
 *
 * This file may be redistributed under the terms of the
 * GNU Lesser General Public License.
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdint.h>

#include "superblocks.h"

/* linux-2.6/include/linux/swap.h */
struct swap_header_v1_2 {
     /* char    bootbits[1024]; */ /* Space for disklabel etc. */
  uint32_t  version;
  uint32_t  lastpage;
  uint32_t  nr_badpages;
  unsigned char uuid[16];
  unsigned char volume[16];
  uint32_t  padding[117];
  uint32_t  badpages[1];
} __attribute__((packed));

#define PAGESIZE_MIN  0xff6 /* 4086 (arm, i386, ...) */
#define PAGESIZE_MAX  0xfff6  /* 65526 (ia64) */

#define TOI_MAGIC_STRING  "\xed\xc3\x02\xe9\x98\x56\xe5\x0c"
#define TOI_MAGIC_STRLEN  (sizeof(TOI_MAGIC_STRING) - 1)

static void swap_set_info_swap1(blkid_probe pr,
    const struct blkid_idmag *mag,
    const struct swap_header_v1_2 *hdr)
{
  enum blkid_endianness endianness = le32_to_cpu(hdr->version) == 1 ?
    BLKID_ENDIANNESS_LITTLE : BLKID_ENDIANNESS_BIG;
  blkid_probe_set_fsendianness(pr, endianness);

  uint32_t pagesize = mag->sboff + mag->len;
  blkid_probe_set_fsblocksize(pr, pagesize);

  uint32_t lastpage = endianness == BLKID_ENDIANNESS_LITTLE ?
    le32_to_cpu(hdr->lastpage) : be32_to_cpu(hdr->lastpage);
  blkid_probe_set_fssize(pr, (uint64_t) pagesize * lastpage);
}

static int swap_set_info(blkid_probe pr, const struct blkid_idmag *mag,
    const char *version)
{
  struct swap_header_v1_2 *hdr;

  /* Swap header always located at offset of 1024 bytes */
  hdr = (struct swap_header_v1_2 *) blkid_probe_get_buffer(pr, 1024,
        sizeof(struct swap_header_v1_2));
  if (!hdr)
    return errno ? -errno : 1;

  /* SWAPSPACE2 - check for wrong version or zeroed pagecount */
  if (strcmp(version, "1") == 0) {
    if (hdr->version != 1 && swab32(hdr->version) != 1) {
      DBG(LOWPROBE, ul_debug("incorrect swap version"));
      return 1;
    }
    if (hdr->lastpage == 0) {
      DBG(LOWPROBE, ul_debug("not set last swap page"));
      return 1;
    }
    swap_set_info_swap1(pr, mag, hdr);
  }

  /* arbitrary sanity check.. is there any garbage down there? */
  if (hdr->padding[32] == 0 && hdr->padding[33] == 0) {
    if (hdr->volume[0] && blkid_probe_set_label(pr, hdr->volume,
        sizeof(hdr->volume)) < 0)
      return 1;
    if (blkid_probe_set_uuid(pr, hdr->uuid) < 0)
      return 1;
  }

  blkid_probe_set_version(pr, version);
  return 0;
}

static int probe_swap(blkid_probe pr, const struct blkid_idmag *mag)
{
  const unsigned char *buf;

  if (!mag)
    return 1;

  /* TuxOnIce keeps valid swap header at the end of the 1st page */
  buf = blkid_probe_get_buffer(pr, 0, TOI_MAGIC_STRLEN);
  if (!buf)
    return errno ? -errno : 1;

  if (memcmp(buf, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN) == 0)
    return 1;  /* Ignore swap signature, it's TuxOnIce */

  if (!memcmp(mag->magic, "SWAP-SPACE", mag->len)) {
    /* swap v0 doesn't support LABEL or UUID */
    blkid_probe_set_version(pr, "0");
    return 0;

  }

  if (!memcmp(mag->magic, "SWAPSPACE2", mag->len))
    return swap_set_info(pr, mag, "1");

  return 1;
}

static int probe_swsuspend(blkid_probe pr, const struct blkid_idmag *mag)
{
  if (!mag)
    return 1;
  if (!memcmp(mag->magic, "S1SUSPEND", mag->len))
    return swap_set_info(pr, mag, "s1suspend");
  if (!memcmp(mag->magic, "S2SUSPEND", mag->len))
    return swap_set_info(pr, mag, "s2suspend");
  if (!memcmp(mag->magic, "ULSUSPEND", mag->len))
    return swap_set_info(pr, mag, "ulsuspend");
  if (!memcmp(mag->magic, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN))
    return swap_set_info(pr, mag, "tuxonice");
  if (!memcmp(mag->magic, "LINHIB0001", mag->len))
    return swap_set_info(pr, mag, "linhib0001");

  return 1; /* no signature detected */
}

const struct blkid_idinfo swap_idinfo =
{
  .name   = "swap",
  .usage    = BLKID_USAGE_OTHER,
  .probefunc  = probe_swap,
  .minsz    = 10 * 4096,  /* 10 pages */
  .magics   =
  {
    { .magic = "SWAP-SPACE", .len = 10, .sboff = 0xff6 },
    { .magic = "SWAPSPACE2", .len = 10, .sboff = 0xff6 },
    { .magic = "SWAP-SPACE", .len = 10, .sboff = 0x1ff6 },
    { .magic = "SWAPSPACE2", .len = 10, .sboff = 0x1ff6 },
    { .magic = "SWAP-SPACE", .len = 10, .sboff = 0x3ff6 },
    { .magic = "SWAPSPACE2", .len = 10, .sboff = 0x3ff6 },
    { .magic = "SWAP-SPACE", .len = 10, .sboff = 0x7ff6 },
    { .magic = "SWAPSPACE2", .len = 10, .sboff = 0x7ff6 },
    { .magic = "SWAP-SPACE", .len = 10, .sboff = 0xfff6 },
    { .magic = "SWAPSPACE2", .len = 10, .sboff = 0xfff6 },
    { NULL }
  }
};


const struct blkid_idinfo swsuspend_idinfo =
{
  .name   = "swsuspend",
  .usage    = BLKID_USAGE_OTHER,
  .probefunc  = probe_swsuspend,
  .minsz    = 10 * 4096,  /* 10 pages */
  .magics   =
  {
    { .magic = TOI_MAGIC_STRING, .len = TOI_MAGIC_STRLEN },
    { .magic = "S1SUSPEND", .len = 9, .sboff = 0xff6 },
    { .magic = "S2SUSPEND", .len = 9, .sboff = 0xff6 },
    { .magic = "ULSUSPEND", .len = 9, .sboff = 0xff6 },
    { .magic = "LINHIB0001", .len = 10, .sboff = 0xff6 },

    { .magic = "S1SUSPEND", .len = 9, .sboff = 0x1ff6 },
    { .magic = "S2SUSPEND", .len = 9, .sboff = 0x1ff6 },
    { .magic = "ULSUSPEND", .len = 9, .sboff = 0x1ff6 },
    { .magic = "LINHIB0001", .len = 10, .sboff = 0x1ff6 },

    { .magic = "S1SUSPEND", .len = 9, .sboff = 0x3ff6 },
    { .magic = "S2SUSPEND", .len = 9, .sboff = 0x3ff6 },
    { .magic = "ULSUSPEND", .len = 9, .sboff = 0x3ff6 },
    { .magic = "LINHIB0001", .len = 10, .sboff = 0x3ff6 },

    { .magic = "S1SUSPEND", .len = 9, .sboff = 0x7ff6 },
    { .magic = "S2SUSPEND", .len = 9, .sboff = 0x7ff6 },
    { .magic = "ULSUSPEND", .len = 9, .sboff = 0x7ff6 },
    { .magic = "LINHIB0001", .len = 10, .sboff = 0x7ff6 },

    { .magic = "S1SUSPEND", .len = 9, .sboff = 0xfff6 },
    { .magic = "S2SUSPEND", .len = 9, .sboff = 0xfff6 },
    { .magic = "ULSUSPEND", .len = 9, .sboff = 0xfff6 },
    { .magic = "LINHIB0001", .len = 10, .sboff = 0xfff6 },
    { NULL }
  }
};

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright (C) 1999 by Andries Brouwer
3		* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
4		* Copyright (C) 2001 by Andreas Dilger
5		* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6		* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
7		*
8		* This file may be redistributed under the terms of the
9		* GNU Lesser General Public License.
10		*/
11		#include <stdio.h>
12		#include <stdlib.h>
13		#include <unistd.h>
14		#include <string.h>
15		#include <errno.h>
16		#include <ctype.h>
17		#include <stdint.h>
18
19		#include "superblocks.h"
20
21		/* linux-2.6/include/linux/swap.h */
22		struct swap_header_v1_2 {
23		/* char bootbits[1024]; / / Space for disklabel etc. */
24		uint32_t version;
25		uint32_t lastpage;
26		uint32_t nr_badpages;
27		unsigned char uuid[16];
28		unsigned char volume[16];
29		uint32_t padding[117];
30		uint32_t badpages[1];
31		} __attribute__((packed));
32
33		#define PAGESIZE_MIN 0xff6 /* 4086 (arm, i386, ...) */
34		#define PAGESIZE_MAX 0xfff6 /* 65526 (ia64) */
35
36	1.10k	#define TOI_MAGIC_STRING "\xed\xc3\x02\xe9\x98\x56\xe5\x0c"
37	686	#define TOI_MAGIC_STRLEN (sizeof(TOI_MAGIC_STRING) - 1)
38
39		static void swap_set_info_swap1(blkid_probe pr,
40		const struct blkid_idmag *mag,
41		const struct swap_header_v1_2 *hdr)
42	7	{
43	7	enum blkid_endianness endianness = le32_to_cpu(hdr->version) == 1 ?
44	4	BLKID_ENDIANNESS_LITTLE : BLKID_ENDIANNESS_BIG;
45	7	blkid_probe_set_fsendianness(pr, endianness);
46
47	7	uint32_t pagesize = mag->sboff + mag->len;
48	7	blkid_probe_set_fsblocksize(pr, pagesize);
49
50	7	uint32_t lastpage = endianness == BLKID_ENDIANNESS_LITTLE ?
51	4	le32_to_cpu(hdr->lastpage) : be32_to_cpu(hdr->lastpage);
52	7	blkid_probe_set_fssize(pr, (uint64_t) pagesize * lastpage);
53	7	}
54
55		static int swap_set_info(blkid_probe pr, const struct blkid_idmag *mag,
56		const char *version)
57	596	{
58	596	struct swap_header_v1_2 *hdr;
59
60		/* Swap header always located at offset of 1024 bytes */
61	596	hdr = (struct swap_header_v1_2 *) blkid_probe_get_buffer(pr, 1024,
62	596	sizeof(struct swap_header_v1_2));
63	596	if (!hdr)
64	0	return errno ? -errno : 1;
65
66		/* SWAPSPACE2 - check for wrong version or zeroed pagecount */
67	596	if (strcmp(version, "1") == 0) {
68	263	if (hdr->version != 1 && swab32(hdr->version) != 1) {
69	248	DBG(LOWPROBE, ul_debug("incorrect swap version"));
70	248	return 1;
71	248	}
72	15	if (hdr->lastpage == 0) {
73	8	DBG(LOWPROBE, ul_debug("not set last swap page"));
74	8	return 1;
75	8	}
76	7	swap_set_info_swap1(pr, mag, hdr);
77	7	}
78
79		/* arbitrary sanity check.. is there any garbage down there? */
80	340	if (hdr->padding[32] == 0 && hdr->padding[33] == 0) {
81	105	if (hdr->volume[0] && blkid_probe_set_label(pr, hdr->volume,
82	50	sizeof(hdr->volume)) < 0)
83	0	return 1;
84	105	if (blkid_probe_set_uuid(pr, hdr->uuid) < 0)
85	0	return 1;
86	105	}
87
88	340	blkid_probe_set_version(pr, version);
89	340	return 0;
90	340	}
91
92		static int probe_swap(blkid_probe pr, const struct blkid_idmag *mag)
93	269	{
94	269	const unsigned char *buf;
95
96	269	if (!mag)
97	0	return 1;
98
99		/* TuxOnIce keeps valid swap header at the end of the 1st page */
100	269	buf = blkid_probe_get_buffer(pr, 0, TOI_MAGIC_STRLEN);
101	269	if (!buf)
102	0	return errno ? -errno : 1;
103
104	269	if (memcmp(buf, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN) == 0)
105	4	return 1; /* Ignore swap signature, it's TuxOnIce */
106
107	265	if (!memcmp(mag->magic, "SWAP-SPACE", mag->len)) {
108		/* swap v0 doesn't support LABEL or UUID */
109	2	blkid_probe_set_version(pr, "0");
110	2	return 0;
111
112	2	}
113
114	263	if (!memcmp(mag->magic, "SWAPSPACE2", mag->len))
115	263	return swap_set_info(pr, mag, "1");
116
117	0	return 1;
118	263	}
119
120		static int probe_swsuspend(blkid_probe pr, const struct blkid_idmag *mag)
121	333	{
122	333	if (!mag)
123	0	return 1;
124	333	if (!memcmp(mag->magic, "S1SUSPEND", mag->len))
125	23	return swap_set_info(pr, mag, "s1suspend");
126	310	if (!memcmp(mag->magic, "S2SUSPEND", mag->len))
127	48	return swap_set_info(pr, mag, "s2suspend");
128	262	if (!memcmp(mag->magic, "ULSUSPEND", mag->len))
129	114	return swap_set_info(pr, mag, "ulsuspend");
130	148	if (!memcmp(mag->magic, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN))
131	49	return swap_set_info(pr, mag, "tuxonice");
132	99	if (!memcmp(mag->magic, "LINHIB0001", mag->len))
133	99	return swap_set_info(pr, mag, "linhib0001");
134
135	0	return 1; /* no signature detected */
136	99	}
137
138		const struct blkid_idinfo swap_idinfo =
139		{
140		.name = "swap",
141		.usage = BLKID_USAGE_OTHER,
142		.probefunc = probe_swap,
143		.minsz = 10 * 4096, /* 10 pages */
144		.magics =
145		{
146		{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0xff6 },
147		{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0xff6 },
148		{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0x1ff6 },
149		{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0x1ff6 },
150		{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0x3ff6 },
151		{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0x3ff6 },
152		{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0x7ff6 },
153		{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0x7ff6 },
154		{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0xfff6 },
155		{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0xfff6 },
156		{ NULL }
157		}
158		};
159
160
161		const struct blkid_idinfo swsuspend_idinfo =
162		{
163		.name = "swsuspend",
164		.usage = BLKID_USAGE_OTHER,
165		.probefunc = probe_swsuspend,
166		.minsz = 10 * 4096, /* 10 pages */
167		.magics =
168		{
169		{ .magic = TOI_MAGIC_STRING, .len = TOI_MAGIC_STRLEN },
170		{ .magic = "S1SUSPEND", .len = 9, .sboff = 0xff6 },
171		{ .magic = "S2SUSPEND", .len = 9, .sboff = 0xff6 },
172		{ .magic = "ULSUSPEND", .len = 9, .sboff = 0xff6 },
173		{ .magic = "LINHIB0001", .len = 10, .sboff = 0xff6 },
174
175		{ .magic = "S1SUSPEND", .len = 9, .sboff = 0x1ff6 },
176		{ .magic = "S2SUSPEND", .len = 9, .sboff = 0x1ff6 },
177		{ .magic = "ULSUSPEND", .len = 9, .sboff = 0x1ff6 },
178		{ .magic = "LINHIB0001", .len = 10, .sboff = 0x1ff6 },
179
180		{ .magic = "S1SUSPEND", .len = 9, .sboff = 0x3ff6 },
181		{ .magic = "S2SUSPEND", .len = 9, .sboff = 0x3ff6 },
182		{ .magic = "ULSUSPEND", .len = 9, .sboff = 0x3ff6 },
183		{ .magic = "LINHIB0001", .len = 10, .sboff = 0x3ff6 },
184
185		{ .magic = "S1SUSPEND", .len = 9, .sboff = 0x7ff6 },
186		{ .magic = "S2SUSPEND", .len = 9, .sboff = 0x7ff6 },
187		{ .magic = "ULSUSPEND", .len = 9, .sboff = 0x7ff6 },
188		{ .magic = "LINHIB0001", .len = 10, .sboff = 0x7ff6 },
189
190		{ .magic = "S1SUSPEND", .len = 9, .sboff = 0xfff6 },
191		{ .magic = "S2SUSPEND", .len = 9, .sboff = 0xfff6 },
192		{ .magic = "ULSUSPEND", .len = 9, .sboff = 0xfff6 },
193		{ .magic = "LINHIB0001", .len = 10, .sboff = 0xfff6 },
194		{ NULL }
195		}
196		};

Coverage Report

Created: 2024-05-21 06:33