diff options
Diffstat (limited to 'contrib/libarchive/libarchive/archive_read_support_format_tar.c')
-rw-r--r-- | contrib/libarchive/libarchive/archive_read_support_format_tar.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/contrib/libarchive/libarchive/archive_read_support_format_tar.c b/contrib/libarchive/libarchive/archive_read_support_format_tar.c index c2003e7..2ead16f 100644 --- a/contrib/libarchive/libarchive/archive_read_support_format_tar.c +++ b/contrib/libarchive/libarchive/archive_read_support_format_tar.c @@ -136,6 +136,7 @@ struct tar { int64_t entry_padding; int64_t entry_bytes_unconsumed; int64_t realsize; + int sparse_allowed; struct sparse_block *sparse_list; struct sparse_block *sparse_last; int64_t sparse_offset; @@ -1226,6 +1227,14 @@ header_common(struct archive_read *a, struct tar *tar, * sparse information in the extended area. */ /* FALLTHROUGH */ + case '0': + /* + * Enable sparse file "read" support only for regular + * files and explicit GNU sparse files. However, we + * don't allow non-standard file types to be sparse. + */ + tar->sparse_allowed = 1; + /* FALLTHROUGH */ default: /* Regular file and non-standard types */ /* * Per POSIX: non-recognized types should always be @@ -1685,6 +1694,14 @@ pax_attribute(struct archive_read *a, struct tar *tar, #endif switch (key[0]) { case 'G': + /* Reject GNU.sparse.* headers on non-regular files. */ + if (strncmp(key, "GNU.sparse", 10) == 0 && + !tar->sparse_allowed) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, + "Non-regular file cannot be sparse"); + return (ARCHIVE_FATAL); + } + /* GNU "0.0" sparse pax format. */ if (strcmp(key, "GNU.sparse.numblocks") == 0) { tar->sparse_offset = -1; |