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#include "cache.h" #include "pack.h" #include "pack-revindex.h" struct idx_entry { off_t offset; const unsigned char *sha1; unsigned int nr; }; static int compare_entries(const void *e1, const void *e2) { const struct idx_entry *entry1 = e1; const struct idx_entry *entry2 = e2; if (entry1->offset < entry2->offset) return -1; if (entry1->offset > entry2->offset) return 1; return 0; } int check_pack_crc(struct packed_git *p, struct pack_window **w_curs, off_t offset, off_t len, unsigned int nr) { const uint32_t *index_crc; uint32_t data_crc = crc32(0, Z_NULL, 0); do { unsigned int avail; void *data = use_pack(p, w_curs, offset, &avail); if (avail > len) avail = len; data_crc = crc32(data_crc, data, avail); offset += avail; len -= avail; } while (len); index_crc = p->index_data; index_crc += 2 + 256 + p->num_objects * (20/4) + nr; return data_crc != ntohl(*index_crc); } static int verify_packfile(struct packed_git *p, struct pack_window **w_curs) { off_t index_size = p->index_size; const unsigned char *index_base = p->index_data; git_SHA_CTX ctx; unsigned char sha1[20], *pack_sig; off_t offset = 0, pack_sig_ofs = 0; uint32_t nr_objects, i; int err = 0; struct idx_entry *entries; /* Note that the pack header checks are actually performed by * use_pack when it first opens the pack file. If anything * goes wrong during those checks then the call will die out * immediately. */ git_SHA1_Init(&ctx); do { unsigned int remaining; unsigned char *in = use_pack(p, w_curs, offset, &remaining); offset += remaining; if (!pack_sig_ofs) pack_sig_ofs = p->pack_size - 20; if (offset > pack_sig_ofs) remaining -= (unsigned int)(offset - pack_sig_ofs); git_SHA1_Update(&ctx, in, remaining); } while (offset < pack_sig_ofs); git_SHA1_Final(sha1, &ctx); pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL); if (hashcmp(sha1, pack_sig)) err = error("%s SHA1 checksum mismatch", p->pack_name); if (hashcmp(index_base + index_size - 40, pack_sig)) err = error("%s SHA1 does not match its inddex", p->pack_name); unuse_pack(w_curs); /* Make sure everything reachable from idx is valid. Since we * have verified that nr_objects matches between idx and pack, * we do not do scan-streaming check on the pack file. */ nr_objects = p->num_objects; entries = xmalloc((nr_objects + 1) * sizeof(*entries)); entries[nr_objects].offset = pack_sig_ofs; /* first sort entries by pack offset, since unpacking them is more efficient that way */ for (i = 0; i < nr_objects; i++) { entries[i].sha1 = nth_packed_object_sha1(p, i); if (!entries[i].sha1) die("internal error pack-check nth-packed-object"); entries[i].offset = nth_packed_object_offset(p, i); entries[i].nr = i; } qsort(entries, nr_objects, sizeof(*entries), compare_entries); for (i = 0; i < nr_objects; i++) { void *data; enum object_type type; unsigned long size; if (p->index_version > 1) { off_t offset = entries[i].offset; off_t len = entries[i+1].offset - offset; unsigned int nr = entries[i].nr; if (check_pack_crc(p, w_curs, offset, len, nr)) err = error("index CRC mismatch for object %s " "from %s at offset %"PRIuMAX"", sha1_to_hex(entries[i].sha1), p->pack_name, (uintmax_t)offset); } data = unpack_entry(p, entries[i].offset, &type, &size); if (!data) { err = error("cannot unpack %s from %s at offset %"PRIuMAX"", sha1_to_hex(entries[i].sha1), p->pack_name, (uintmax_t)entries[i].offset); break; } if (check_sha1_signature(entries[i].sha1, data, size, typename(type))) { err = error("packed %s from %s is corrupt", sha1_to_hex(entries[i].sha1), p->pack_name); free(data); break; } free(data); } free(entries); return err; } int verify_pack(struct packed_git *p) { off_t index_size; const unsigned char *index_base; git_SHA_CTX ctx; unsigned char sha1[20]; int err = 0; struct pack_window *w_curs = NULL; if (open_pack_index(p)) return error("packfile %s index not opened", p->pack_name); index_size = p->index_size; index_base = p->index_data; /* Verify SHA1 sum of the index file */ git_SHA1_Init(&ctx); git_SHA1_Update(&ctx, index_base, (unsigned int)(index_size - 20)); git_SHA1_Final(sha1, &ctx); if (hashcmp(sha1, index_base + index_size - 20)) err = error("Packfile index for %s SHA1 mismatch", p->pack_name); /* Verify pack file */ err |= verify_packfile(p, &w_curs); unuse_pack(&w_curs); return err; }
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