3 files changed, 35 insertions, 6 deletions
diff --git a/archival/Config.in b/archival/Config.in
index 661c71ccf..49070da06 100644
--- a/archival/Config.in
+++ b/archival/Config.in
@@ -205,6 +205,15 @@ config FEATURE_TAR_OLDGNU_COMPATIBILITY
          the old GNU format; help to kill this old format by
          repacking your ancient archives with the new format.
+config FEATURE_TAR_OLDSUN_COMPATIBILITY
+        bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
+        default N
+        depends on TAR
+        help
+          This option is required to unpack archives created by some old
+          version of Sun's tar (it was calculating checksum using signed arithmetic).
+          It is said to be fixed in newer Sun tar, but "old" tarballs still exist.
 config FEATURE_TAR_GNU_EXTENSIONS
        bool "Enable support for some GNU tar extensions"
        default y
diff --git a/archival/libunarchive/get_header_cpio.c b/archival/libunarchive/get_header_cpio.c
index 724368be2..3f5135512 100644
--- a/archival/libunarchive/get_header_cpio.c
+++ b/archival/libunarchive/get_header_cpio.c
@@ -16,8 +16,9 @@ typedef struct hardlinks_s {
 char get_header_cpio(archive_handle_t *archive_handle)
 {
        static hardlinks_t *saved_hardlinks = NULL;
-        static unsigned short pending_hardlinks = 0;
+        static unsigned pending_hardlinks = 0;
        static int inode;
        file_header_t *file_header = archive_handle->file_header;
        char cpio_header[110];
        int namesize;
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index d42f4c276..1a7a687cf 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -36,7 +36,7 @@ static unsigned long long getOctal(char *str, int len)
        */
        str[len] = '\0';
        v = strtoull(str, &str, 8);
-        if (*str)
+        if (*str && (!ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY || *str != ' '))
                bb_error_msg_and_die("corrupted octal value in tar header");
        return v;
 }
@@ -45,7 +45,7 @@ static unsigned long long getOctal(char *str, int len)
 void BUG_tar_header_size(void);
 char get_header_tar(archive_handle_t *archive_handle)
 {
-        static int end;
+        static smallint end;
        file_header_t *file_header = archive_handle->file_header;
        struct {
@@ -69,7 +69,10 @@ char get_header_tar(archive_handle_t *archive_handle)
                char padding[12];   /* 500-512 */
        } tar;
        char *cp;
-        int i, sum_u, sum_s, sum;
+        int i, sum_u, sum;
+#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
+        int sum_s;
+#endif
        int parse_names;
        if (sizeof(tar) != 512)
@@ -115,20 +118,36 @@ char get_header_tar(archive_handle_t *archive_handle)
         * POSIX says that checksum is done on unsigned bytes, but
         * Sun and HP-UX gets it wrong... more details in
         * GNU tar source. */
-        sum_s = sum_u = ' ' * sizeof(tar.chksum);
+#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
+        sum_s = ' ' * sizeof(tar.chksum);
+#endif
+        sum_u = ' ' * sizeof(tar.chksum);
        for (i = 0; i < 148 ; i++) {
                sum_u += ((unsigned char*)&tar)[i];
+#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
                sum_s += ((signed char*)&tar)[i];
+#endif
        }
        for (i = 156; i < 512 ; i++) {
                sum_u += ((unsigned char*)&tar)[i];
+#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
                sum_s += ((signed char*)&tar)[i];
+#endif
+        }
+#if ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY
+        sum = strtoul(tar.chksum, &cp, 8);
+        if ((*cp && *cp != ' ')
+         || (sum_u != sum USE_FEATURE_TAR_OLDSUN_COMPATIBILITY(&& sum_s != sum))
+        ) {
+                bb_error_msg_and_die("invalid tar header checksum");
        }
+#else
        /* This field does not need special treatment (getOctal) */
        sum = xstrtoul(tar.chksum, 8);
-        if (sum_u != sum && sum_s != sum) {
+        if (sum_u != sum USE_FEATURE_TAR_OLDSUN_COMPATIBILITY(&& sum_s != sum)) {
                bb_error_msg_and_die("invalid tar header checksum");
        }
+#endif
        /* 0 is reserved for high perf file, treat as normal file */
        if (!tar.typeflag) tar.typeflag = '0';