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authorDenis Vlasenko <vda.linux@googlemail.com>2008-07-12 09:20:44 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2008-07-12 09:20:44 +0000
commita46dd89e9451ec73a4df54427110cdfc28d8b031 (patch)
tree2e470b3c0236524905a6d399c5207cccaef2fc7b /archival/libunarchive
parent39acf453353a41a78fbc220360e884eb0eb33a59 (diff)
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cpio: internalize archive_xread_all_eof. add a few paranoia checks
for corrupted cpio files. modprobe-small: remove stray include route: small code shrink function old new delta get_header_cpio 958 980 +22 archive_xread_all_eof 33 - -33 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 1/0 up/down: 22/-33) Total: -11 bytes
Diffstat (limited to 'archival/libunarchive')
-rw-r--r--archival/libunarchive/Kbuild2
-rw-r--r--archival/libunarchive/archive_xread_all_eof.c20
-rw-r--r--archival/libunarchive/get_header_cpio.c69
-rw-r--r--archival/libunarchive/get_header_tar.c2
4 files changed, 38 insertions, 55 deletions
diff --git a/archival/libunarchive/Kbuild b/archival/libunarchive/Kbuild
index 609bc50cb..468a7e82a 100644
--- a/archival/libunarchive/Kbuild
+++ b/archival/libunarchive/Kbuild
@@ -19,8 +19,6 @@ lib-y:= \
19 header_list.o \ 19 header_list.o \
20 header_verbose_list.o \ 20 header_verbose_list.o \
21\ 21\
22 archive_xread_all_eof.o \
23\
24 seek_by_read.o \ 22 seek_by_read.o \
25 seek_by_jump.o \ 23 seek_by_jump.o \
26\ 24\
diff --git a/archival/libunarchive/archive_xread_all_eof.c b/archival/libunarchive/archive_xread_all_eof.c
deleted file mode 100644
index f11a7fd32..000000000
--- a/archival/libunarchive/archive_xread_all_eof.c
+++ /dev/null
@@ -1,20 +0,0 @@
1/* vi: set sw=4 ts=4: */
2/*
3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
4 */
5
6#include "libbb.h"
7#include "unarchive.h"
8
9ssize_t FAST_FUNC archive_xread_all_eof(archive_handle_t *archive_handle,
10 unsigned char *buf, size_t count)
11{
12 ssize_t size;
13
14 size = full_read(archive_handle->src_fd, buf, count);
15 if (size != 0 && size != (ssize_t)count) {
16 bb_error_msg_and_die("short read: %u of %u",
17 (unsigned)size, (unsigned)count);
18 }
19 return size;
20}
diff --git a/archival/libunarchive/get_header_cpio.c b/archival/libunarchive/get_header_cpio.c
index 307d2a66d..93f6c61aa 100644
--- a/archival/libunarchive/get_header_cpio.c
+++ b/archival/libunarchive/get_header_cpio.c
@@ -21,26 +21,28 @@ char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
21{ 21{
22 file_header_t *file_header = archive_handle->file_header; 22 file_header_t *file_header = archive_handle->file_header;
23 char cpio_header[110]; 23 char cpio_header[110];
24 char dummy[16];
25 int namesize; 24 int namesize;
26 int major, minor, nlink, mode, inode; 25 int major, minor, nlink, mode, inode;
27 unsigned size, uid, gid, mtime; 26 unsigned size, uid, gid, mtime;
28 27
29#define saved_hardlinks (*(hardlinks_t **)(&archive_handle->ah_priv[0])) 28#define hardlinks_to_create (*(hardlinks_t **)(&archive_handle->ah_priv[0]))
30#define saved_hardlinks_created (*(hardlinks_t **)(&archive_handle->ah_priv[1])) 29#define created_hardlinks (*(hardlinks_t **)(&archive_handle->ah_priv[1]))
31// if (!archive_handle->ah_priv_inited) { 30// if (!archive_handle->ah_priv_inited) {
32// archive_handle->ah_priv_inited = 1; 31// archive_handle->ah_priv_inited = 1;
33// saved_hardlinks = NULL; 32// hardlinks_to_create = NULL;
34// saved_hardlinks_created = NULL; 33// created_hardlinks = NULL;
35// } 34// }
36 35
37 /* There can be padding before archive header */ 36 /* There can be padding before archive header */
38 data_align(archive_handle, 4); 37 data_align(archive_handle, 4);
39 38
40//TODO: this function is used only here, make it static? 39 size = full_read(archive_handle->src_fd, cpio_header, 110);
41 if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) { 40 if (size == 0) {
42 goto create_hardlinks; 41 goto create_hardlinks;
43 } 42 }
43 if (size != 110) {
44 bb_error_msg_and_die("short read");
45 }
44 archive_handle->offset += 110; 46 archive_handle->offset += 110;
45 47
46 if (strncmp(&cpio_header[0], "07070", 5) != 0 48 if (strncmp(&cpio_header[0], "07070", 5) != 0
@@ -49,20 +51,21 @@ char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
49 bb_error_msg_and_die("unsupported cpio format, use newc or crc"); 51 bb_error_msg_and_die("unsupported cpio format, use newc or crc");
50 } 52 }
51 53
52 sscanf(cpio_header + 6, 54 if (sscanf(cpio_header + 6,
53 "%8x" "%8x" "%8x" "%8x" 55 "%8x" "%8x" "%8x" "%8x"
54 "%8x" "%8x" "%8x" /*maj,min:*/ "%16c" 56 "%8x" "%8x" "%8x" /*maj,min:*/ "%*16c"
55 /*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum:*/ "%8c", 57 /*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum: "%*8c"*/,
56 &inode, &mode, &uid, &gid, 58 &inode, &mode, &uid, &gid,
57 &nlink, &mtime, &size, dummy, 59 &nlink, &mtime, &size,
58 &major, &minor, &namesize, dummy); 60 &major, &minor, &namesize) != 10)
61 bb_error_msg_and_die("damaged cpio file");
59 file_header->mode = mode; 62 file_header->mode = mode;
60 file_header->uid = uid; 63 file_header->uid = uid;
61 file_header->gid = gid; 64 file_header->gid = gid;
62 file_header->mtime = mtime; 65 file_header->mtime = mtime;
63 file_header->size = size; 66 file_header->size = size;
64 67
65 namesize &= 0x1fff; /* paranoia: names can't be that long */ 68 namesize &= 0x1fff; /* paranoia: limit names to 8k chars */
66 file_header->name = xzalloc(namesize + 1); 69 file_header->name = xzalloc(namesize + 1);
67 /* Read in filename */ 70 /* Read in filename */
68 xread(archive_handle->src_fd, file_header->name, namesize); 71 xread(archive_handle->src_fd, file_header->name, namesize);
@@ -77,17 +80,17 @@ char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
77 goto create_hardlinks; 80 goto create_hardlinks;
78 } 81 }
79 82
83 file_header->link_target = NULL;
80 if (S_ISLNK(file_header->mode)) { 84 if (S_ISLNK(file_header->mode)) {
85 file_header->size &= 0x1fff; /* paranoia: limit names to 8k chars */
81 file_header->link_target = xzalloc(file_header->size + 1); 86 file_header->link_target = xzalloc(file_header->size + 1);
82 xread(archive_handle->src_fd, file_header->link_target, file_header->size); 87 xread(archive_handle->src_fd, file_header->link_target, file_header->size);
83 archive_handle->offset += file_header->size; 88 archive_handle->offset += file_header->size;
84 file_header->size = 0; /* Stop possible seeks in future */ 89 file_header->size = 0; /* Stop possible seeks in future */
85 } else {
86 file_header->link_target = NULL;
87 } 90 }
88 91
89// TODO: data_extract_all can't deal with hardlinks to non-files... 92// TODO: data_extract_all can't deal with hardlinks to non-files...
90// (should be !S_ISDIR instead of S_ISREG here) 93// when fixed, change S_ISREG to !S_ISDIR here
91 94
92 if (nlink > 1 && S_ISREG(file_header->mode)) { 95 if (nlink > 1 && S_ISREG(file_header->mode)) {
93 hardlinks_t *new = xmalloc(sizeof(*new) + namesize); 96 hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
@@ -99,13 +102,13 @@ char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
99 strcpy(new->name, file_header->name); 102 strcpy(new->name, file_header->name);
100 /* Put file on a linked list for later */ 103 /* Put file on a linked list for later */
101 if (size == 0) { 104 if (size == 0) {
102 new->next = saved_hardlinks; 105 new->next = hardlinks_to_create;
103 saved_hardlinks = new; 106 hardlinks_to_create = new;
104 return EXIT_SUCCESS; /* Skip this one */ 107 return EXIT_SUCCESS; /* Skip this one */
105 /* TODO: this breaks cpio -t (it does not show hardlinks) */ 108 /* TODO: this breaks cpio -t (it does not show hardlinks) */
106 } 109 }
107 new->next = saved_hardlinks_created; 110 new->next = created_hardlinks;
108 saved_hardlinks_created = new; 111 created_hardlinks = new;
109 } 112 }
110 file_header->device = makedev(major, minor); 113 file_header->device = makedev(major, minor);
111 114
@@ -129,18 +132,23 @@ char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
129 free(file_header->link_target); 132 free(file_header->link_target);
130 free(file_header->name); 133 free(file_header->name);
131 134
132 while (saved_hardlinks) { 135 while (hardlinks_to_create) {
133 hardlinks_t *cur; 136 hardlinks_t *cur;
134 hardlinks_t *make_me = saved_hardlinks; 137 hardlinks_t *make_me = hardlinks_to_create;
135 saved_hardlinks = make_me->next; 138
139 hardlinks_to_create = make_me->next;
136 140
137 memset(file_header, 0, sizeof(*file_header)); 141 memset(file_header, 0, sizeof(*file_header));
142 file_header->mtime = make_me->mtime;
138 file_header->name = make_me->name; 143 file_header->name = make_me->name;
139 file_header->mode = make_me->mode; 144 file_header->mode = make_me->mode;
145 file_header->uid = make_me->uid;
146 file_header->gid = make_me->gid;
140 /*file_header->size = 0;*/ 147 /*file_header->size = 0;*/
148 /*file_header->link_target = NULL;*/
141 149
142 /* Try to find a file we are hardlinked to */ 150 /* Try to find a file we are hardlinked to */
143 cur = saved_hardlinks_created; 151 cur = created_hardlinks;
144 while (cur) { 152 while (cur) {
145 /* TODO: must match maj/min too! */ 153 /* TODO: must match maj/min too! */
146 if (cur->inode == make_me->inode) { 154 if (cur->inode == make_me->inode) {
@@ -155,20 +163,17 @@ char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
155 } 163 }
156 /* Oops... no file with such inode was created... do it now 164 /* Oops... no file with such inode was created... do it now
157 * (happens when hardlinked files are empty (zero length)) */ 165 * (happens when hardlinked files are empty (zero length)) */
158 file_header->mtime = make_me->mtime;
159 file_header->uid = make_me->uid ;
160 file_header->gid = make_me->gid ;
161 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) 166 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
162 archive_handle->action_data(archive_handle); 167 archive_handle->action_data(archive_handle);
163 /* Move to the list of created hardlinked files */ 168 /* Move to the list of created hardlinked files */
164 make_me->next = saved_hardlinks_created; 169 make_me->next = created_hardlinks;
165 saved_hardlinks_created = make_me; 170 created_hardlinks = make_me;
166 next_link: ; 171 next_link: ;
167 } 172 }
168 173
169 while (saved_hardlinks_created) { 174 while (created_hardlinks) {
170 hardlinks_t *p = saved_hardlinks_created; 175 hardlinks_t *p = created_hardlinks;
171 saved_hardlinks_created = p->next; 176 created_hardlinks = p->next;
172 free(p); 177 free(p);
173 } 178 }
174 179
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index e9c730d65..7e3c482df 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -364,7 +364,7 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle)
364 archive_handle->offset += file_header->size; 364 archive_handle->offset += file_header->size;
365 365
366 free(file_header->link_target); 366 free(file_header->link_target);
367 /* Do not free(file_header->name)! */ 367 /* Do not free(file_header->name)! (why?) */
368#if ENABLE_FEATURE_TAR_UNAME_GNAME 368#if ENABLE_FEATURE_TAR_UNAME_GNAME
369 free(file_header->uname); 369 free(file_header->uname);
370 free(file_header->gname); 370 free(file_header->gname);
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-18 04:40:22 +0000