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2010-06-10 Jakub Jelinek <jakub@redhat.com>
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Dan Rosenberg <dan.j.rosenberg@gmail.com>
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* jartool.c (extract_jar): Fix up checks for traversal to parent
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directories, disallow absolute paths, make the code slightly more
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efficient.
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--- fastjar-0.97/jartool.c.jj 2009-09-07 00:10:47.000000000 +0200
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+++ fastjar-0.97/jartool.c 2010-06-08 20:00:29.000000000 +0200
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@@ -1730,7 +1730,17 @@ int extract_jar(int fd, const char **fil
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struct stat sbuf;
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int depth = 0;
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- tmp_buff = malloc(sizeof(char) * strlen((const char *)filename));
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+ if(*filename == '/'){
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+ fprintf(stderr, "Absolute path names are not allowed.\n");
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+ exit(EXIT_FAILURE);
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+ }
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+
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+ tmp_buff = malloc(strlen((const char *)filename));
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+
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+ if(tmp_buff == NULL) {
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+ fprintf(stderr, "Out of memory.\n");
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+ exit(EXIT_FAILURE);
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+ }
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for(;;){
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const ub1 *idx = (const unsigned char *)strchr((const char *)start, '/');
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@@ -1738,25 +1748,28 @@ int extract_jar(int fd, const char **fil
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if(idx == NULL)
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break;
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else if(idx == start){
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+ tmp_buff[idx - filename] = '/';
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start++;
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continue;
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}
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- start = idx + 1;
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- strncpy(tmp_buff, (const char *)filename, (idx - filename));
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- tmp_buff[(idx - filename)] = '\0';
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+ memcpy(tmp_buff + (start - filename), (const char *)start, (idx - start));
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+ tmp_buff[idx - filename] = '\0';
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#ifdef DEBUG
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printf("checking the existance of %s\n", tmp_buff);
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#endif
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- if(strcmp(tmp_buff, "..") == 0){
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+ if(idx - start == 2 && memcmp(start, "..", 2) == 0){
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--depth;
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if (depth < 0){
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fprintf(stderr, "Traversal to parent directories during unpacking!\n");
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exit(EXIT_FAILURE);
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}
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- } else if (strcmp(tmp_buff, ".") != 0)
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+ } else if (idx - start != 1 || *start != '.')
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++depth;
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+
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+ start = idx + 1;
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+
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if(stat(tmp_buff, &sbuf) < 0){
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if(errno != ENOENT)
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exit_on_error("stat");
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@@ -1765,6 +1778,7 @@ int extract_jar(int fd, const char **fil
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#ifdef DEBUG
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printf("Directory exists\n");
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#endif
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+ tmp_buff[idx - filename] = '/';
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continue;
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}else {
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fprintf(stderr, "Hmmm.. %s exists but isn't a directory!\n",
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@@ -1781,10 +1795,11 @@ int extract_jar(int fd, const char **fil
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if(verbose && handle)
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printf("%10s: %s/\n", "created", tmp_buff);
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+ tmp_buff[idx - filename] = '/';
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}
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/* only a directory */
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- if(strlen((const char *)start) == 0)
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+ if(*start == '\0')
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dir = TRUE;
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#ifdef DEBUG
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@@ -1792,7 +1807,7 @@ int extract_jar(int fd, const char **fil
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#endif
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/* If the entry was just a directory, don't write to file, etc */
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- if(strlen((const char *)start) == 0)
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+ if(*start == '\0')
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f_fd = -1;
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free(tmp_buff);
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@@ -1876,7 +1891,8 @@ int extract_jar(int fd, const char **fil
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exit(EXIT_FAILURE);
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}
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- close(f_fd);
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+ if (f_fd != -1)
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+ close(f_fd);
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if(verbose && dir == FALSE && handle)
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printf("%10s: %s\n",
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