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Yinghai Lu 2d3862d26e lib/decompressors: use real out buf size for gunzip with kernel 
When loading x86 64bit kernel above 4GiB with patched grub2, got kernel
gunzip error.

| early console in decompress_kernel
| decompress_kernel:
|       input: [0x807f2143b4-0x807ff61aee]
|      output: [0x807cc00000-0x807f3ea29b] 0x027ea29c: output_len
| boot via startup_64
| KASLR using RDTSC...
|  new output: [0x46fe000000-0x470138cfff] 0x0338d000: output_run_size
|  decompress: [0x46fe000000-0x47007ea29b] <=== [0x807f2143b4-0x807ff61aee]
|
| Decompressing Linux... gz...
|
| uncompression error
|
| -- System halted

the new buffer is at 0x46fe000000ULL, decompressor_gzip is using
0xffffffb901ffffff as out_len.  gunzip in lib/zlib_inflate/inflate.c cap
that len to 0x01ffffff and decompress fails later.

We could hit this problem with crashkernel booting that uses kexec loading
kernel above 4GiB.

We have decompress_* support:
    1. inbuf[]/outbuf[] for kernel preboot.
    2. inbuf[]/flush() for initramfs
    3. fill()/flush() for initrd.
This bug only affect kernel preboot path that use outbuf[].

Add __decompress and take real out_buf_len for gunzip instead of guessing
wrong buf size.

Fixes: 1431574a1c (lib/decompressors: fix "no limit" output buffer length)
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Alexandre Courbot <acourbot@nvidia.com>
Cc: Jon Medhurst <tixy@linaro.org>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2015-09-10 13:29:01 -07:00
..
Makefile MIPS: Fix alignment of quiet build output for vmlinuz link 2015-09-03 12:08:15 +02:00
calc_vmlinuz_load_addr.c MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
dbg.c mips: delete non-required instances of include <linux/init.h> 2014-01-24 22:39:56 +01:00
decompress.c lib/decompressors: use real out buf size for gunzip with kernel 2015-09-10 13:29:01 -07:00
dummy.c
…
head.S MIPS: Add support for vmlinuz.bin appended dtb 2015-06-21 21:54:15 +02:00
ld.script MIPS: Add support for vmlinuz.bin appended dtb 2015-06-21 21:54:15 +02:00
string.c MIPS: ZBOOT: gather string functions into string.c 2014-01-24 22:39:55 +01:00
uart-16550.c MIPS: Loongson: Naming style cleanup and rework 2015-06-21 21:53:59 +02:00
uart-alchemy.c MIPS: Alchemy: Single kernel for DB1200/1300/1550 2012-10-11 11:11:20 +02:00