cpio: error out if the file to be achived is >=4GBbusybox

function                                             old     new   delta
.rodata                                           105715  105751     +36
cpio_o                                              1145    1167     +22
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 58/0)               Total: 58 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/archival/cpio.c b/archival/cpio.c
index f0d990048..7b01ee3a2 100644
--- a/archival/cpio.c
+++ b/archival/cpio.c
@@ -350,6 +350,12 @@ static NOINLINE int cpio_o(void)
                         st.st_dev = st.st_rdev = 0;
 #endif
 
+                if (sizeof(st.st_size) > 4
+                 && st.st_size > (off_t)0xffffffff
+                ) {
+                        bb_error_msg_and_die("error: file '%s' is larger than 4GB", name);
+                }
+
                 bytes += printf("070701"
                                 "%08X%08X%08X%08X%08X%08X%08X"
                                 "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */