The patch titled initramfs: handle unrecognised decompressor when unpacking has been added to the -mm tree. Its filename is initramfs-handle-unrecognised-decompressor-when-unpacking.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: initramfs: handle unrecognised decompressor when unpacking From: Phillip Lougher <phillip@xxxxxxxxxxxxxxxxxxx> The unpack routine fails to handle the decompress_method() returning unrecognised decompressor (compress_name == NULL). This results in the routine looping eventually oopsing on an out of bounds memory access. Note this bug is usually hidden, only triggering on trailing junk after one or more correct compressed blocks. The case of the compressed archive being complete junk is (by accident?) caught by the if (state != Reset) check because state is initialised to Start, but not updated due to the decompressor not having been called. Obviously if the junk is trailing a correctly decompressed buffer, state == Reset from the previous call to the decompressor. Signed-off-by: Phillip Lougher <phillip@xxxxxxxxxxxxxxxxxxx> Reported-by: Aaro Koskinen <aaro.koskinen@xxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- init/initramfs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff -puN init/initramfs.c~initramfs-handle-unrecognised-decompressor-when-unpacking init/initramfs.c --- a/init/initramfs.c~initramfs-handle-unrecognised-decompressor-when-unpacking +++ a/init/initramfs.c @@ -457,7 +457,8 @@ static char * __init unpack_to_rootfs(ch compress_name); message = msg_buf; } - } + } else + error("junk in compressed archive"); if (state != Reset) error("junk in compressed archive"); this_header = saved_offset + my_inptr; _ Patches currently in -mm which might be from phillip@xxxxxxxxxxxxxxxxxxx are initramfs-handle-unrecognised-decompressor-when-unpacking.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html