Apple-2gs-SW/hush
1
0
Fork 0
mirror of https://github.com/sheumann/hush.git synced 2024-12-28 22:30:05 +00:00
Code Issues Projects Releases Wiki Activity

change safety check on zip header to allow for extra length, and

Browse Source 
revert the header read to use the correct constant rather than
sizeof.  at least one version of gcc (armv4-linux-gcc-3.4.1) pads
the struct to 28 bytes in spite of the packing.
This commit is contained in:
Paul Fox 2007-11-05 23:09:03 +00:00
parent f8b21d0933
commit cb981638f5
1 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
archival/unzip.c
View File

@ -41,8 +41,10 @@ enum {
#endif
};
#define ZIP_HEADER_LEN 26
typedef union {
uint8_t raw[26];
uint8_t raw[ZIP_HEADER_LEN];
struct {
uint16_t version; /* 0-1 */
uint16_t flags; /* 2-3 */
@ -57,8 +59,14 @@ typedef union {
} formatted ATTRIBUTE_PACKED;
} zip_header_t;
/* Check the offset of the last element, not the length. This leniency
* allows for poor packing, whereby the overall struct may be too long,
* even though the elements are all in the right place.
*/
struct BUG_zip_header_must_be_26_bytes {
char BUG_zip_header_must_be_26_bytes[sizeof(zip_header_t) == 26 ? 1 : -1];
char BUG_zip_header_must_be_26_bytes[
offsetof(zip_header_t, formatted.extra_len) + 2 ==
ZIP_HEADER_LEN ? 1 : -1];
};
#define FIX_ENDIANNESS(zip_header) do { \
@ -256,7 +264,7 @@ int unzip_main(int argc, char **argv)
bb_error_msg_and_die("invalid zip magic %08X", magic);
/* Read the file header */
xread(src_fd, zip_header.raw, sizeof(zip_header));
xread(src_fd, zip_header.raw, ZIP_HEADER_LEN);
FIX_ENDIANNESS(zip_header);
if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);