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![Yinghai Lu](/assets/img/avatar_default.png)
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]
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| Decompressing Linux... gz...
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| uncompression error
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| -- 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>
205 lines
4.4 KiB
C
205 lines
4.4 KiB
C
#ifdef STATIC
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#define PREBOOT
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/* Pre-boot environment: included */
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/* prevent inclusion of _LINUX_KERNEL_H in pre-boot environment: lots
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* errors about console_printk etc... on ARM */
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#define _LINUX_KERNEL_H
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#include "zlib_inflate/inftrees.c"
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#include "zlib_inflate/inffast.c"
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#include "zlib_inflate/inflate.c"
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#else /* STATIC */
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/* initramfs et al: linked */
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#include <linux/zutil.h>
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#include "zlib_inflate/inftrees.h"
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#include "zlib_inflate/inffast.h"
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#include "zlib_inflate/inflate.h"
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#include "zlib_inflate/infutil.h"
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#include <linux/decompress/inflate.h>
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#endif /* STATIC */
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#include <linux/decompress/mm.h>
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#define GZIP_IOBUF_SIZE (16*1024)
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static long INIT nofill(void *buffer, unsigned long len)
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{
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return -1;
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}
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/* Included from initramfs et al code */
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STATIC int INIT __gunzip(unsigned char *buf, long len,
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long (*fill)(void*, unsigned long),
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long (*flush)(void*, unsigned long),
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unsigned char *out_buf, long out_len,
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long *pos,
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void(*error)(char *x)) {
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u8 *zbuf;
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struct z_stream_s *strm;
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int rc;
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rc = -1;
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if (flush) {
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out_len = 0x8000; /* 32 K */
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out_buf = malloc(out_len);
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} else {
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if (!out_len)
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out_len = ((size_t)~0) - (size_t)out_buf; /* no limit */
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}
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if (!out_buf) {
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error("Out of memory while allocating output buffer");
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goto gunzip_nomem1;
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}
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if (buf)
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zbuf = buf;
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else {
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zbuf = malloc(GZIP_IOBUF_SIZE);
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len = 0;
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}
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if (!zbuf) {
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error("Out of memory while allocating input buffer");
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goto gunzip_nomem2;
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}
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strm = malloc(sizeof(*strm));
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if (strm == NULL) {
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error("Out of memory while allocating z_stream");
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goto gunzip_nomem3;
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}
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strm->workspace = malloc(flush ? zlib_inflate_workspacesize() :
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sizeof(struct inflate_state));
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if (strm->workspace == NULL) {
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error("Out of memory while allocating workspace");
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goto gunzip_nomem4;
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}
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if (!fill)
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fill = nofill;
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if (len == 0)
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len = fill(zbuf, GZIP_IOBUF_SIZE);
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/* verify the gzip header */
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if (len < 10 ||
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zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) {
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if (pos)
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*pos = 0;
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error("Not a gzip file");
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goto gunzip_5;
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}
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/* skip over gzip header (1f,8b,08... 10 bytes total +
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* possible asciz filename)
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*/
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strm->next_in = zbuf + 10;
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strm->avail_in = len - 10;
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/* skip over asciz filename */
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if (zbuf[3] & 0x8) {
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do {
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/*
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* If the filename doesn't fit into the buffer,
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* the file is very probably corrupt. Don't try
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* to read more data.
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*/
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if (strm->avail_in == 0) {
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error("header error");
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goto gunzip_5;
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}
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--strm->avail_in;
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} while (*strm->next_in++);
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}
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strm->next_out = out_buf;
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strm->avail_out = out_len;
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rc = zlib_inflateInit2(strm, -MAX_WBITS);
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if (!flush) {
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WS(strm)->inflate_state.wsize = 0;
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WS(strm)->inflate_state.window = NULL;
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}
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while (rc == Z_OK) {
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if (strm->avail_in == 0) {
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/* TODO: handle case where both pos and fill are set */
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len = fill(zbuf, GZIP_IOBUF_SIZE);
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if (len < 0) {
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rc = -1;
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error("read error");
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break;
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}
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strm->next_in = zbuf;
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strm->avail_in = len;
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}
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rc = zlib_inflate(strm, 0);
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/* Write any data generated */
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if (flush && strm->next_out > out_buf) {
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long l = strm->next_out - out_buf;
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if (l != flush(out_buf, l)) {
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rc = -1;
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error("write error");
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break;
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}
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strm->next_out = out_buf;
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strm->avail_out = out_len;
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}
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/* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
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if (rc == Z_STREAM_END) {
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rc = 0;
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break;
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} else if (rc != Z_OK) {
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error("uncompression error");
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rc = -1;
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}
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}
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zlib_inflateEnd(strm);
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if (pos)
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/* add + 8 to skip over trailer */
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*pos = strm->next_in - zbuf+8;
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gunzip_5:
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free(strm->workspace);
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gunzip_nomem4:
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free(strm);
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gunzip_nomem3:
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if (!buf)
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free(zbuf);
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gunzip_nomem2:
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if (flush)
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free(out_buf);
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gunzip_nomem1:
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return rc; /* returns Z_OK (0) if successful */
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}
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#ifndef PREBOOT
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STATIC int INIT gunzip(unsigned char *buf, long len,
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long (*fill)(void*, unsigned long),
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long (*flush)(void*, unsigned long),
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unsigned char *out_buf,
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long *pos,
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void (*error)(char *x))
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{
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return __gunzip(buf, len, fill, flush, out_buf, 0, pos, error);
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}
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#else
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STATIC int INIT __decompress(unsigned char *buf, long len,
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long (*fill)(void*, unsigned long),
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long (*flush)(void*, unsigned long),
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unsigned char *out_buf, long out_len,
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long *pos,
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void (*error)(char *x))
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{
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return __gunzip(buf, len, fill, flush, out_buf, out_len, pos, error);
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}
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#endif
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