LCOV - code coverage report
Current view: top level - lib - decompress_inflate.c (source / functions) Hit Total Coverage
Test: landlock.info Lines: 0 93 0.0 %
Date: 2021-04-22 12:43:58 Functions: 0 3 0.0 %

          Line data    Source code
       1             : // SPDX-License-Identifier: GPL-2.0
       2             : #ifdef STATIC
       3             : #define PREBOOT
       4             : /* Pre-boot environment: included */
       5             : 
       6             : /* prevent inclusion of _LINUX_KERNEL_H in pre-boot environment: lots
       7             :  * errors about console_printk etc... on ARM */
       8             : #define _LINUX_KERNEL_H
       9             : 
      10             : #include "zlib_inflate/inftrees.c"
      11             : #include "zlib_inflate/inffast.c"
      12             : #include "zlib_inflate/inflate.c"
      13             : #ifdef CONFIG_ZLIB_DFLTCC
      14             : #include "zlib_dfltcc/dfltcc.c"
      15             : #include "zlib_dfltcc/dfltcc_inflate.c"
      16             : #endif
      17             : 
      18             : #else /* STATIC */
      19             : /* initramfs et al: linked */
      20             : 
      21             : #include <linux/zutil.h>
      22             : 
      23             : #include "zlib_inflate/inftrees.h"
      24             : #include "zlib_inflate/inffast.h"
      25             : #include "zlib_inflate/inflate.h"
      26             : 
      27             : #include "zlib_inflate/infutil.h"
      28             : #include <linux/decompress/inflate.h>
      29             : 
      30             : #endif /* STATIC */
      31             : 
      32             : #include <linux/decompress/mm.h>
      33             : 
      34             : #define GZIP_IOBUF_SIZE (16*1024)
      35             : 
      36           0 : static long INIT nofill(void *buffer, unsigned long len)
      37             : {
      38           0 :         return -1;
      39             : }
      40             : 
      41             : /* Included from initramfs et al code */
      42           0 : STATIC int INIT __gunzip(unsigned char *buf, long len,
      43             :                        long (*fill)(void*, unsigned long),
      44             :                        long (*flush)(void*, unsigned long),
      45             :                        unsigned char *out_buf, long out_len,
      46             :                        long *pos,
      47             :                        void(*error)(char *x)) {
      48           0 :         u8 *zbuf;
      49           0 :         struct z_stream_s *strm;
      50           0 :         int rc;
      51             : 
      52           0 :         rc = -1;
      53           0 :         if (flush) {
      54           0 :                 out_len = 0x8000; /* 32 K */
      55           0 :                 out_buf = malloc(out_len);
      56             :         } else {
      57           0 :                 if (!out_len)
      58           0 :                         out_len = ((size_t)~0) - (size_t)out_buf; /* no limit */
      59             :         }
      60           0 :         if (!out_buf) {
      61           0 :                 error("Out of memory while allocating output buffer");
      62           0 :                 goto gunzip_nomem1;
      63             :         }
      64             : 
      65           0 :         if (buf)
      66             :                 zbuf = buf;
      67             :         else {
      68           0 :                 zbuf = malloc(GZIP_IOBUF_SIZE);
      69           0 :                 len = 0;
      70             :         }
      71           0 :         if (!zbuf) {
      72           0 :                 error("Out of memory while allocating input buffer");
      73           0 :                 goto gunzip_nomem2;
      74             :         }
      75             : 
      76           0 :         strm = malloc(sizeof(*strm));
      77           0 :         if (strm == NULL) {
      78           0 :                 error("Out of memory while allocating z_stream");
      79           0 :                 goto gunzip_nomem3;
      80             :         }
      81             : 
      82           0 :         strm->workspace = malloc(flush ? zlib_inflate_workspacesize() :
      83             : #ifdef CONFIG_ZLIB_DFLTCC
      84             :         /* Always allocate the full workspace for DFLTCC */
      85             :                                  zlib_inflate_workspacesize());
      86             : #else
      87             :                                  sizeof(struct inflate_state));
      88             : #endif
      89           0 :         if (strm->workspace == NULL) {
      90           0 :                 error("Out of memory while allocating workspace");
      91           0 :                 goto gunzip_nomem4;
      92             :         }
      93             : 
      94           0 :         if (!fill)
      95           0 :                 fill = nofill;
      96             : 
      97           0 :         if (len == 0)
      98           0 :                 len = fill(zbuf, GZIP_IOBUF_SIZE);
      99             : 
     100             :         /* verify the gzip header */
     101           0 :         if (len < 10 ||
     102           0 :            zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) {
     103           0 :                 if (pos)
     104           0 :                         *pos = 0;
     105           0 :                 error("Not a gzip file");
     106           0 :                 goto gunzip_5;
     107             :         }
     108             : 
     109             :         /* skip over gzip header (1f,8b,08... 10 bytes total +
     110             :          * possible asciz filename)
     111             :          */
     112           0 :         strm->next_in = zbuf + 10;
     113           0 :         strm->avail_in = len - 10;
     114             :         /* skip over asciz filename */
     115           0 :         if (zbuf[3] & 0x8) {
     116           0 :                 do {
     117             :                         /*
     118             :                          * If the filename doesn't fit into the buffer,
     119             :                          * the file is very probably corrupt. Don't try
     120             :                          * to read more data.
     121             :                          */
     122           0 :                         if (strm->avail_in == 0) {
     123           0 :                                 error("header error");
     124           0 :                                 goto gunzip_5;
     125             :                         }
     126           0 :                         --strm->avail_in;
     127           0 :                 } while (*strm->next_in++);
     128             :         }
     129             : 
     130           0 :         strm->next_out = out_buf;
     131           0 :         strm->avail_out = out_len;
     132             : 
     133           0 :         rc = zlib_inflateInit2(strm, -MAX_WBITS);
     134             : 
     135             : #ifdef CONFIG_ZLIB_DFLTCC
     136             :         /* Always keep the window for DFLTCC */
     137             : #else
     138           0 :         if (!flush) {
     139           0 :                 WS(strm)->inflate_state.wsize = 0;
     140           0 :                 WS(strm)->inflate_state.window = NULL;
     141             :         }
     142             : #endif
     143             : 
     144           0 :         while (rc == Z_OK) {
     145           0 :                 if (strm->avail_in == 0) {
     146             :                         /* TODO: handle case where both pos and fill are set */
     147           0 :                         len = fill(zbuf, GZIP_IOBUF_SIZE);
     148           0 :                         if (len < 0) {
     149           0 :                                 rc = -1;
     150           0 :                                 error("read error");
     151           0 :                                 break;
     152             :                         }
     153           0 :                         strm->next_in = zbuf;
     154           0 :                         strm->avail_in = len;
     155             :                 }
     156           0 :                 rc = zlib_inflate(strm, 0);
     157             : 
     158             :                 /* Write any data generated */
     159           0 :                 if (flush && strm->next_out > out_buf) {
     160           0 :                         long l = strm->next_out - out_buf;
     161           0 :                         if (l != flush(out_buf, l)) {
     162           0 :                                 rc = -1;
     163           0 :                                 error("write error");
     164           0 :                                 break;
     165             :                         }
     166           0 :                         strm->next_out = out_buf;
     167           0 :                         strm->avail_out = out_len;
     168             :                 }
     169             : 
     170             :                 /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
     171           0 :                 if (rc == Z_STREAM_END) {
     172             :                         rc = 0;
     173             :                         break;
     174           0 :                 } else if (rc != Z_OK) {
     175           0 :                         error("uncompression error");
     176           0 :                         rc = -1;
     177             :                 }
     178             :         }
     179             : 
     180           0 :         zlib_inflateEnd(strm);
     181           0 :         if (pos)
     182             :                 /* add + 8 to skip over trailer */
     183           0 :                 *pos = strm->next_in - zbuf+8;
     184             : 
     185           0 : gunzip_5:
     186           0 :         free(strm->workspace);
     187           0 : gunzip_nomem4:
     188           0 :         free(strm);
     189           0 : gunzip_nomem3:
     190           0 :         if (!buf)
     191           0 :                 free(zbuf);
     192           0 : gunzip_nomem2:
     193           0 :         if (flush)
     194           0 :                 free(out_buf);
     195           0 : gunzip_nomem1:
     196           0 :         return rc; /* returns Z_OK (0) if successful */
     197             : }
     198             : 
     199             : #ifndef PREBOOT
     200           0 : STATIC int INIT gunzip(unsigned char *buf, long len,
     201             :                        long (*fill)(void*, unsigned long),
     202             :                        long (*flush)(void*, unsigned long),
     203             :                        unsigned char *out_buf,
     204             :                        long *pos,
     205             :                        void (*error)(char *x))
     206             : {
     207           0 :         return __gunzip(buf, len, fill, flush, out_buf, 0, pos, error);
     208             : }
     209             : #else
     210             : STATIC int INIT __decompress(unsigned char *buf, long len,
     211             :                            long (*fill)(void*, unsigned long),
     212             :                            long (*flush)(void*, unsigned long),
     213             :                            unsigned char *out_buf, long out_len,
     214             :                            long *pos,
     215             :                            void (*error)(char *x))
     216             : {
     217             :         return __gunzip(buf, len, fill, flush, out_buf, out_len, pos, error);
     218             : }
     219             : #endif

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