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lib/decompressors: use real out buf size for gunzip with kernel

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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>
This commit is contained in:
Yinghai Lu 2015-09-09 15:39:12 -07:00 committed by Linus Torvalds
parent e852d82a5b
commit 2d3862d26e
14 changed files with 70 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/boot/compressed/decompress.c
View File

@ -57,5 +57,5 @@ extern char * strstr(const char * s1, const char *s2);
int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
{
return decompress(input, len, NULL, NULL, output, NULL, error);
return __decompress(input, len, NULL, NULL, output, 0, NULL, error);
}

2
arch/h8300/boot/compressed/misc.c
View File

@ -70,5 +70,5 @@ void decompress_kernel(void)
free_mem_ptr = (unsigned long)&_end;
free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
decompress(input_data, input_len, NULL, NULL, output, NULL, error);
__decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
}

3
arch/m32r/boot/compressed/misc.c
View File

@ -86,6 +86,7 @@ decompress_kernel(int mmu_on, unsigned char *zimage_data,
free_mem_end_ptr = free_mem_ptr + BOOT_HEAP_SIZE;
puts("\nDecompressing Linux... ");
decompress(input_data, input_len, NULL, NULL, output_data, NULL, error);
__decompress(input_data, input_len, NULL, NULL, output_data, 0,
NULL, error);
puts("done.\nBooting the kernel.\n");
}

4
arch/mips/boot/compressed/decompress.c
View File

@ -111,8 +111,8 @@ void decompress_kernel(unsigned long boot_heap_start)
puts("\n");
/* Decompress the kernel with according algorithm */
decompress((char *)zimage_start, zimage_size, 0, 0,
(void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
__decompress((char *)zimage_start, zimage_size, 0, 0,
(void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error);
/* FIXME: should we flush cache here? */
puts("Now, booting the kernel...\n");

2
arch/s390/boot/compressed/misc.c
View File

@ -167,7 +167,7 @@ unsigned long decompress_kernel(void)
#endif
puts("Uncompressing Linux... ");
decompress(input_data, input_len, NULL, NULL, output, NULL, error);
__decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
puts("Ok, booting the kernel.\n");
return (unsigned long) output;
}

2
arch/sh/boot/compressed/misc.c
View File

@ -132,7 +132,7 @@ void decompress_kernel(void)
puts("Uncompressing Linux... ");
cache_control(CACHE_ENABLE);
decompress(input_data, input_len, NULL, NULL, output, NULL, error);
__decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
cache_control(CACHE_DISABLE);
puts("Ok, booting the kernel.\n");
}

4
arch/unicore32/boot/compressed/misc.c
View File

@ -119,8 +119,8 @@ unsigned long decompress_kernel(unsigned long output_start,
output_ptr = get_unaligned_le32(tmp);
arch_decomp_puts("Uncompressing Linux...");
decompress(input_data, input_data_end - input_data, NULL, NULL,
output_data, NULL, error);
__decompress(input_data, input_data_end - input_data, NULL, NULL,
output_data, 0, NULL, error);
arch_decomp_puts(" done, booting the kernel.\n");
return output_ptr;
}

3
arch/x86/boot/compressed/misc.c
View File

@ -448,7 +448,8 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
#endif
debug_putstr("\nDecompressing Linux... ");
decompress(input_data, input_len, NULL, NULL, output, NULL, error);
__decompress(input_data, input_len, NULL, NULL, output, output_len,
NULL, error);
parse_elf(output);
/*
* 32-bit always performs relocations. 64-bit relocations are only

6
lib/decompress_bunzip2.c
View File

@ -743,12 +743,12 @@ STATIC int INIT bunzip2(unsigned char *buf, long len,
}
#ifdef PREBOOT
STATIC int INIT decompress(unsigned char *buf, long len,
STATIC int INIT __decompress(unsigned char *buf, long len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *outbuf,
unsigned char *outbuf, long olen,
long *pos,
void(*error)(char *x))
void (*error)(char *x))
{
return bunzip2(buf, len - 4, fill, flush, outbuf, pos, error);
}

31
lib/decompress_inflate.c
View File

@ -1,4 +1,5 @@
#ifdef STATIC
#define PREBOOT
/* Pre-boot environment: included */
/* prevent inclusion of _LINUX_KERNEL_H in pre-boot environment: lots
@ -33,23 +34,23 @@ static long INIT nofill(void *buffer, unsigned long len)
}
/* Included from initramfs et al code */
STATIC int INIT gunzip(unsigned char *buf, long len,
STATIC int INIT __gunzip(unsigned char *buf, long len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *out_buf,
unsigned char *out_buf, long out_len,
long *pos,
void(*error)(char *x)) {
u8 *zbuf;
struct z_stream_s *strm;
int rc;
size_t out_len;
rc = -1;
if (flush) {
out_len = 0x8000; /* 32 K */
out_buf = malloc(out_len);
} else {
out_len = ((size_t)~0) - (size_t)out_buf; /* no limit */
if (!out_len)
out_len = ((size_t)~0) - (size_t)out_buf; /* no limit */
}
if (!out_buf) {
error("Out of memory while allocating output buffer");
@ -181,4 +182,24 @@ STATIC int INIT gunzip(unsigned char *buf, long len,
return rc; /* returns Z_OK (0) if successful */
}
#define decompress gunzip
#ifndef PREBOOT
STATIC int INIT gunzip(unsigned char *buf, long len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *out_buf,
long *pos,
void (*error)(char *x))
{
return __gunzip(buf, len, fill, flush, out_buf, 0, pos, error);
}
#else
STATIC int INIT __decompress(unsigned char *buf, long len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *out_buf, long out_len,
long *pos,
void (*error)(char *x))
{
return __gunzip(buf, len, fill, flush, out_buf, out_len, pos, error);
}
#endif

6
lib/decompress_unlz4.c
View File

@ -196,12 +196,12 @@ STATIC inline int INIT unlz4(u8 *input, long in_len,
}
#ifdef PREBOOT
STATIC int INIT decompress(unsigned char *buf, long in_len,
STATIC int INIT __decompress(unsigned char *buf, long in_len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *output,
unsigned char *output, long out_len,
long *posp,
void(*error)(char *x)
void (*error)(char *x)
)
{
return unlz4(buf, in_len - 4, fill, flush, output, posp, error);

7
lib/decompress_unlzma.c
View File

@ -667,13 +667,12 @@ STATIC inline int INIT unlzma(unsigned char *buf, long in_len,
}
#ifdef PREBOOT
STATIC int INIT decompress(unsigned char *buf, long in_len,
STATIC int INIT __decompress(unsigned char *buf, long in_len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *output,
unsigned char *output, long out_len,
long *posp,
void(*error)(char *x)
)
void (*error)(char *x))
{
return unlzma(buf, in_len - 4, fill, flush, output, posp, error);
}

13
lib/decompress_unlzo.c
View File

@ -31,6 +31,7 @@
*/
#ifdef STATIC
#define PREBOOT
#include "lzo/lzo1x_decompress_safe.c"
#else
#include <linux/decompress/unlzo.h>
@ -287,4 +288,14 @@ STATIC int INIT unlzo(u8 *input, long in_len,
return ret;
}
#define decompress unlzo
#ifdef PREBOOT
STATIC int INIT __decompress(unsigned char *buf, long len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *out_buf, long olen,
long *pos,
void (*error)(char *x))
{
return unlzo(buf, len, fill, flush, out_buf, pos, error);
}
#endif

12
lib/decompress_unxz.c
View File

@ -394,4 +394,14 @@ STATIC int INIT unxz(unsigned char *in, long in_size,
* This macro is used by architecture-specific files to decompress
* the kernel image.
*/
#define decompress unxz
#ifdef XZ_PREBOOT
STATIC int INIT __decompress(unsigned char *buf, long len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *out_buf, long olen,
long *pos,
void (*error)(char *x))
{
return unxz(buf, len, fill, flush, out_buf, pos, error);
}
#endif