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cpio: fix unpacking of names with leading slashes

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function                                             old     new   delta
get_header_cpio                                      968     990     +22
cpio_main                                            533     526      -7

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-01-05 04:43:21 +01:00
parent 074e8dcba7
commit af1c8e8be0
3 changed files with 13 additions and 2 deletions
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2
archival/cpio.c
View File

@ -364,7 +364,7 @@ int cpio_main(int argc UNUSED_PARAM, char **argv)
#endif
archive_handle = init_handle();
archive_handle->src_fd = STDIN_FILENO;
/* archive_handle->src_fd = STDIN_FILENO; - done by init_handle */
archive_handle->seek = seek_by_read;
archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;

9
archival/libunarchive/get_header_cpio.c
View File

@ -70,6 +70,15 @@ char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
file_header->name = xzalloc(namesize + 1);
/* Read in filename */
xread(archive_handle->src_fd, file_header->name, namesize);
if (file_header->name[0] == '/') {
/* Testcase: echo /etc/hosts | cpio -pvd /tmp
* Without this code, it tries to unpack /etc/hosts
* into "/etc/hosts", not "etc/hosts".
*/
char *p = file_header->name;
do p++; while (*p == '/');
overlapping_strcpy(file_header->name, p);
}
archive_handle->offset += namesize;
/* Update offset amount and skip padding before file contents */

4
testsuite/cpio.tests
View File

@ -36,6 +36,7 @@ ls -ln cpio.testdir | $FILTER_LS" \
"\
1 blocks
0
total 0
-rw-r--r-- 2 $user $group 0 x
-rw-r--r-- 2 $user $group 0 y
" \
@ -47,10 +48,10 @@ test x"$SKIP_KNOWN_BUGS" = x"" && {
testing "cpio lists hardlinks" \
"$ECHO -ne '$hexdump' | bzcat | cpio -t 2>&1; echo \$?" \
"\
1 block
cpio.testdir
cpio.testdir/x
cpio.testdir/y
1 blocks
0
" \
"" ""
@ -72,6 +73,7 @@ ls -ln cpio.testdir2/cpio.testdir | $FILTER_LS" \
"\
2 blocks
0
total 8
-rw-r--r-- 2 $user $group 0 empty
-rw-r--r-- 2 $user $group 0 empty1
-rw-r--r-- 2 $user $group 2 nonempty