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chromium / external / github.com / git / git / refs/tags/v2.45.0 / . / pack-check.c
blob: 25104d5b14c1e8f9a9988f106a1ad1a6823ca31c [file] [log] [blame]
Elijah Newrenb6fdc442023-04-11 07:41:54[diff] [blame]1#include "git-compat-util.h"
Elijah Newren32a8f512023-03-21 06:26:03[diff] [blame]2#include "environment.h"
Elijah Newren41771fa2023-02-24 00:09:27[diff] [blame]3#include "hex.h"
Stefan Beller57a6a502018-04-25 18:21:04[diff] [blame]4#include "repository.h"
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]5#include "pack.h"
Nguyễn Thái Ngọc Duy1e49f222011-11-07 02:59:26[diff] [blame]6#include "progress.h"
Jonathan Tan0317f452017-08-18 22:20:19[diff] [blame]7#include "packfile.h"
Elijah Newren87bed172023-04-11 07:41:53[diff] [blame]8#include "object-file.h"
Elijah Newrena034e912023-05-16 06:34:06[diff] [blame]9#include "object-store-ll.h"
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]10
Jonathan Nieder9cba13c2011-03-16 07:08:34[diff] [blame]11struct idx_entry {
Alexandre Julliard3af51922007-06-03 18:21:41[diff] [blame]12 off_t offset;
Nicolas Pitrec41a4a92008-06-25 03:19:02[diff] [blame]13 unsigned int nr;
Alexandre Julliard3af51922007-06-03 18:21:41[diff] [blame]14};
15
16static int compare_entries(const void *e1, const void *e2)
17{
18 const struct idx_entry *entry1 = e1;
19 const struct idx_entry *entry2 = e2;
20 if (entry1->offset < entry2->offset)
21 return -1;
22 if (entry1->offset > entry2->offset)
23 return 1;
24 return 0;
25}
26
Nicolas Pitrec41a4a92008-06-25 03:19:02[diff] [blame]27int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
28 off_t offset, off_t len, unsigned int nr)
29{
30 const uint32_t *index_crc;
Stephen Boyd1e4cd682011-04-03 07:06:54[diff] [blame]31 uint32_t data_crc = crc32(0, NULL, 0);
Nicolas Pitrec41a4a92008-06-25 03:19:02[diff] [blame]32
33 do {
Junio C Hamanoef49a7a2011-06-10 18:52:15[diff] [blame]34 unsigned long avail;
Nicolas Pitrec41a4a92008-06-25 03:19:02[diff] [blame]35 void *data = use_pack(p, w_curs, offset, &avail);
36 if (avail > len)
37 avail = len;
38 data_crc = crc32(data_crc, data, avail);
39 offset += avail;
40 len -= avail;
41 } while (len);
42
43 index_crc = p->index_data;
Jeff Kingf86f7692020-11-13 05:06:48[diff] [blame]44 index_crc += 2 + 256 + (size_t)p->num_objects * (the_hash_algo->rawsz/4) + nr;
Nicolas Pitrec41a4a92008-06-25 03:19:02[diff] [blame]45
46 return data_crc != ntohl(*index_crc);
47}
48
Nguyễn Thái Ngọc Duy94e10822018-11-10 05:49:07[diff] [blame]49static int verify_packfile(struct repository *r,
50 struct packed_git *p,
Nguyễn Thái Ngọc Duyc9486eb2011-11-07 02:59:25[diff] [blame]51 struct pack_window **w_curs,
Nguyễn Thái Ngọc Duy1e49f222011-11-07 02:59:26[diff] [blame]52 verify_fn fn,
53 struct progress *progress, uint32_t base_count)
54
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]55{
Shawn O. Pearcec4001d92007-03-07 01:44:30[diff] [blame]56 off_t index_size = p->index_size;
Nicolas Pitre42873072007-03-16 20:42:50[diff] [blame]57 const unsigned char *index_base = p->index_data;
brian m. carlsonccc12e02018-02-01 02:18:43[diff] [blame]58 git_hash_ctx ctx;
brian m. carlson9fd75042017-05-06 22:10:20[diff] [blame]59 unsigned char hash[GIT_MAX_RAWSZ], *pack_sig;
Mike Hommey4277c672009-01-18 08:04:26[diff] [blame]60 off_t offset = 0, pack_sig_ofs = 0;
Shawn O. Pearce326bf392007-03-07 01:44:19[diff] [blame]61 uint32_t nr_objects, i;
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]62 int err = 0;
Alexandre Julliard3af51922007-06-03 18:21:41[diff] [blame]63 struct idx_entry *entries;
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]64
Jeff Kinga9445d82016-09-22 03:49:05[diff] [blame]65 if (!is_pack_valid(p))
66 return error("packfile %s cannot be accessed", p->pack_name);
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]67
Matheus Tavares5ec9b8a2020-01-30 20:32:19[diff] [blame]68 r->hash_algo->init_fn(&ctx);
Mike Hommey4277c672009-01-18 08:04:26[diff] [blame]69 do {
Junio C Hamanoef49a7a2011-06-10 18:52:15[diff] [blame]70 unsigned long remaining;
Shawn O. Pearce079afb12006-12-23 07:34:13[diff] [blame]71 unsigned char *in = use_pack(p, w_curs, offset, &remaining);
72 offset += remaining;
Mike Hommey4277c672009-01-18 08:04:26[diff] [blame]73 if (!pack_sig_ofs)
Matheus Tavares5ec9b8a2020-01-30 20:32:19[diff] [blame]74 pack_sig_ofs = p->pack_size - r->hash_algo->rawsz;
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]75 if (offset > pack_sig_ofs)
76 remaining -= (unsigned int)(offset - pack_sig_ofs);
Matheus Tavares5ec9b8a2020-01-30 20:32:19[diff] [blame]77 r->hash_algo->update_fn(&ctx, in, remaining);
Mike Hommey4277c672009-01-18 08:04:26[diff] [blame]78 } while (offset < pack_sig_ofs);
Matheus Tavares5ec9b8a2020-01-30 20:32:19[diff] [blame]79 r->hash_algo->final_fn(hash, &ctx);
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]80 pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
Jeff King67947c32018-08-28 21:22:52[diff] [blame]81 if (!hasheq(hash, pack_sig))
brian m. carlsonccc12e02018-02-01 02:18:43[diff] [blame]82 err = error("%s pack checksum mismatch",
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]83 p->pack_name);
Matheus Tavares5ec9b8a2020-01-30 20:32:19[diff] [blame]84 if (!hasheq(index_base + index_size - r->hash_algo->hexsz, pack_sig))
brian m. carlsonccc12e02018-02-01 02:18:43[diff] [blame]85 err = error("%s pack checksum does not match its index",
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]86 p->pack_name);
Shawn O. Pearce079afb12006-12-23 07:34:13[diff] [blame]87 unuse_pack(w_curs);
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]88
89 /* Make sure everything reachable from idx is valid. Since we
90 * have verified that nr_objects matches between idx and pack,
91 * we do not do scan-streaming check on the pack file.
92 */
Nicolas Pitre57059092007-04-09 05:06:28[diff] [blame]93 nr_objects = p->num_objects;
Jeff Kingb32fa952016-02-22 22:44:25[diff] [blame]94 ALLOC_ARRAY(entries, nr_objects + 1);
Nicolas Pitrec41a4a92008-06-25 03:19:02[diff] [blame]95 entries[nr_objects].offset = pack_sig_ofs;
Alexandre Julliard3af51922007-06-03 18:21:41[diff] [blame]96 /* first sort entries by pack offset, since unpacking them is more efficient that way */
97 for (i = 0; i < nr_objects; i++) {
Nicolas Pitre99093232008-06-25 03:17:12[diff] [blame]98 entries[i].offset = nth_packed_object_offset(p, i);
Nicolas Pitrec41a4a92008-06-25 03:19:02[diff] [blame]99 entries[i].nr = i;
Alexandre Julliard3af51922007-06-03 18:21:41[diff] [blame]100 }
René Scharfe9ed0d8d2016-09-29 15:27:31[diff] [blame]101 QSORT(entries, nr_objects, compare_entries);
Alexandre Julliard3af51922007-06-03 18:21:41[diff] [blame]102
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]103 for (i = 0; i < nr_objects; i++) {
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]104 void *data;
Jeff King63f4a7f2020-02-24 04:36:31[diff] [blame]105 struct object_id oid;
Nicolas Pitre21666f12007-02-26 19:55:59[diff] [blame]106 enum object_type type;
Shawn O. Pearcec4001d92007-03-07 01:44:30[diff] [blame]107 unsigned long size;
Nguyễn Thái Ngọc Duyec9d2242016-07-13 15:44:04[diff] [blame]108 off_t curpos;
109 int data_valid;
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]110
Jeff King63f4a7f2020-02-24 04:36:31[diff] [blame]111 if (nth_packed_object_id(&oid, p, entries[i].nr) < 0)
112 BUG("unable to get oid of object %lu from %s",
113 (unsigned long)entries[i].nr, p->pack_name);
114
Nicolas Pitrec41a4a92008-06-25 03:19:02[diff] [blame]115 if (p->index_version > 1) {
116 off_t offset = entries[i].offset;
117 off_t len = entries[i+1].offset - offset;
118 unsigned int nr = entries[i].nr;
119 if (check_pack_crc(p, w_curs, offset, len, nr))
120 err = error("index CRC mismatch for object %s "
121 "from %s at offset %"PRIuMAX"",
Jeff King63f4a7f2020-02-24 04:36:31[diff] [blame]122 oid_to_hex(&oid),
Nicolas Pitrec41a4a92008-06-25 03:19:02[diff] [blame]123 p->pack_name, (uintmax_t)offset);
124 }
Nguyễn Thái Ngọc Duyec9d2242016-07-13 15:44:04[diff] [blame]125
126 curpos = entries[i].offset;
127 type = unpack_object_header(p, w_curs, &curpos, &size);
128 unuse_pack(w_curs);
129
130 if (type == OBJ_BLOB && big_file_threshold <= size) {
131 /*
Ævar Arnfjörð Bjarmason0f156db2022-02-04 23:48:30[diff] [blame]132 * Let stream_object_signature() check it with
Nguyễn Thái Ngọc Duyec9d2242016-07-13 15:44:04[diff] [blame]133 * the streaming interface; no point slurping
134 * the data in-core only to discard.
135 */
136 data = NULL;
137 data_valid = 0;
138 } else {
Nguyễn Thái Ngọc Duy94e10822018-11-10 05:49:07[diff] [blame]139 data = unpack_entry(r, p, entries[i].offset, &type, &size);
Nguyễn Thái Ngọc Duyec9d2242016-07-13 15:44:04[diff] [blame]140 data_valid = 1;
141 }
142
143 if (data_valid && !data)
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]144 err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
Jeff King63f4a7f2020-02-24 04:36:31[diff] [blame]145 oid_to_hex(&oid), p->pack_name,
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]146 (uintmax_t)entries[i].offset);
Ævar Arnfjörð Bjarmason0f156db2022-02-04 23:48:30[diff] [blame]147 else if (data && check_object_signature(r, &oid, data, size,
Ævar Arnfjörð Bjarmason44439c12022-02-04 23:48:32[diff] [blame]148 type) < 0)
Ævar Arnfjörð Bjarmason0f156db2022-02-04 23:48:30[diff] [blame]149 err = error("packed %s from %s is corrupt",
150 oid_to_hex(&oid), p->pack_name);
151 else if (!data && stream_object_signature(r, &oid) < 0)
Junio C Hamano1038f0c2005-07-07 22:12:20[diff] [blame]152 err = error("packed %s from %s is corrupt",
Jeff King63f4a7f2020-02-24 04:36:31[diff] [blame]153 oid_to_hex(&oid), p->pack_name);
Nguyễn Thái Ngọc Duyc9486eb2011-11-07 02:59:25[diff] [blame]154 else if (fn) {
155 int eaten = 0;
Jeff King63f4a7f2020-02-24 04:36:31[diff] [blame]156 err |= fn(&oid, type, size, data, &eaten);
Nguyễn Thái Ngọc Duyc9486eb2011-11-07 02:59:25[diff] [blame]157 if (eaten)
158 data = NULL;
159 }
Nguyễn Thái Ngọc Duy1e49f222011-11-07 02:59:26[diff] [blame]160 if (((base_count + i) & 1023) == 0)
161 display_progress(progress, base_count + i);
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]162 free(data);
Nguyễn Thái Ngọc Duy1e49f222011-11-07 02:59:26[diff] [blame]163
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]164 }
Nguyễn Thái Ngọc Duy1e49f222011-11-07 02:59:26[diff] [blame]165 display_progress(progress, base_count + i);
Alexandre Julliard3af51922007-06-03 18:21:41[diff] [blame]166 free(entries);
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]167
168 return err;
169}
170
Shawn O. Pearce9b0aa722010-04-19 14:23:07[diff] [blame]171int verify_pack_index(struct packed_git *p)
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]172{
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]173 int err = 0;
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]174
Shawn O. Pearced0798372007-05-26 05:24:19[diff] [blame]175 if (open_pack_index(p))
176 return error("packfile %s index not opened", p->pack_name);
Shawn O. Pearced0798372007-05-26 05:24:19[diff] [blame]177
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]178 /* Verify SHA1 sum of the index file */
Taylor Blauf9221e22021-06-23 18:39:07[diff] [blame]179 if (!hashfile_checksum_valid(p->index_data, p->index_size))
brian m. carlsonccc12e02018-02-01 02:18:43[diff] [blame]180 err = error("Packfile index for %s hash mismatch",
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]181 p->pack_name);
Shawn O. Pearce9b0aa722010-04-19 14:23:07[diff] [blame]182 return err;
183}
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]184
Nguyễn Thái Ngọc Duy94e10822018-11-10 05:49:07[diff] [blame]185int verify_pack(struct repository *r, struct packed_git *p, verify_fn fn,
Nguyễn Thái Ngọc Duy1e49f222011-11-07 02:59:26[diff] [blame]186 struct progress *progress, uint32_t base_count)
Shawn O. Pearce9b0aa722010-04-19 14:23:07[diff] [blame]187{
188 int err = 0;
189 struct pack_window *w_curs = NULL;
190
191 err |= verify_pack_index(p);
192 if (!p->index_data)
193 return -1;
194
Nguyễn Thái Ngọc Duy94e10822018-11-10 05:49:07[diff] [blame]195 err |= verify_packfile(r, p, &w_curs, fn, progress, base_count);
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]196 unuse_pack(&w_curs);
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]197
Nicolas Pitre62413602008-05-29 21:34:50[diff] [blame]198 return err;
Junio C Hamanof3bf9222005-07-01 00:15:39[diff] [blame]199}