AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch/sh/boot/compressed
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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
..
.gitignore sh: bzip2/lzma zImage support. 2009-07-11 13:21:19 -04:00
cache.c arch/sh/boot/compressed/cache.c: Checkpatch cleanup 2010-03-01 11:57:31 +09:00
head_32.S sh: boot kernel with SR.BL set 2010-09-30 09:43:32 +09:00
head_64.S sh: Fix up the sh64 zImage build. 2009-05-10 00:36:22 +09:00
install.sh kbuild: use INSTALLKERNEL to select customized installkernel script 2009-09-20 12:18:14 +02:00
Makefile sh: Remove compressed kernel libgcc dependency. 2011-06-06 17:57:58 +09:00
misc.c lib/decompressors: use real out buf size for gunzip with kernel 2015-09-10 13:29:01 -07:00
vmlinux.scr Rename .rodata.compressed to .rodata..compressed. 2010-03-03 11:26:00 +01:00