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execve(): lookup_exec_path() support for symlinks based on COKERNEL_EXEC_ROOT

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This commit is contained in:
Balazs Gerofi bgerofi@riken.jp
2014-09-04 18:11:41 +09:00
parent e45632c9f8
commit 15c9ae4c8d
1 changed files with 36 additions and 1 deletions
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37
executer/user/mcexec.c
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@ -340,8 +340,13 @@ unsigned char *dma_buf;
int lookup_exec_path(char *filename, char *path, int max_len)
{
int found = 0;
int found;
int error;
struct stat sb;
char *link_path = NULL;
retry:
found = 0;
/* Is file not absolute path? */
if (strncmp(filename, "/", 1)) {
@ -418,6 +423,36 @@ int lookup_exec_path(char *filename, char *path, int max_len)
found = 1;
}
if (link_path) {
free(link_path);
link_path = NULL;
}
/* Check whether the resolved path is a symlink */
if (lstat(path, &sb) == -1) {
fprintf(stderr, "lookup_exec_path(): error stat\n");
return errno;
}
if ((sb.st_mode & S_IFMT) == S_IFLNK) {
char *link_path = malloc(max_len);
if (!link_path) {
fprintf(stderr, "lookup_exec_path(): error allocating\n");
return ENOMEM;
}
error = readlink(path, link_path, max_len);
if (error == -1 || error == max_len) {
fprintf(stderr, "lookup_exec_path(): error readlink\n");
return EINVAL;
}
__dprintf("lookup_exec_path(): %s is link -> %s\n", path, link_path);
filename = link_path;
goto retry;
}
if (!found) {
fprintf(stderr,
"lookup_exec_path(): error finding file %s\n", filename);