diff options
Diffstat (limited to 'crypto/openssh/openbsd-compat/realpath.c')
| -rw-r--r-- | crypto/openssh/openbsd-compat/realpath.c | 61 |
1 files changed, 45 insertions, 16 deletions
diff --git a/crypto/openssh/openbsd-compat/realpath.c b/crypto/openssh/openbsd-compat/realpath.c index ba4cea9..a2f090e 100644 --- a/crypto/openssh/openbsd-compat/realpath.c +++ b/crypto/openssh/openbsd-compat/realpath.c @@ -1,4 +1,4 @@ -/* $OpenBSD: realpath.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */ +/* $OpenBSD: realpath.c,v 1.20 2015/10/13 20:55:37 millert Exp $ */ /* * Copyright (c) 2003 Constantin S. Svintsoff <kostik@iclub.nsu.ru> * @@ -42,6 +42,13 @@ #include <stddef.h> #include <string.h> #include <unistd.h> +#include <limits.h> + +#ifndef SYMLOOP_MAX +# define SYMLOOP_MAX 32 +#endif + +/* A slightly modified copy of this file exists in libexec/ld.so */ /* * char *realpath(const char *path, char resolved[PATH_MAX]); @@ -51,16 +58,30 @@ * in which case the path which caused trouble is left in (resolved). */ char * -realpath(const char *path, char resolved[PATH_MAX]) +realpath(const char *path, char *resolved) { struct stat sb; char *p, *q, *s; size_t left_len, resolved_len; unsigned symlinks; - int serrno, slen; + int serrno, slen, mem_allocated; char left[PATH_MAX], next_token[PATH_MAX], symlink[PATH_MAX]; + if (path[0] == '\0') { + errno = ENOENT; + return (NULL); + } + serrno = errno; + + if (resolved == NULL) { + resolved = malloc(PATH_MAX); + if (resolved == NULL) + return (NULL); + mem_allocated = 1; + } else + mem_allocated = 0; + symlinks = 0; if (path[0] == '/') { resolved[0] = '/'; @@ -71,7 +92,10 @@ realpath(const char *path, char resolved[PATH_MAX]) left_len = strlcpy(left, path + 1, sizeof(left)); } else { if (getcwd(resolved, PATH_MAX) == NULL) { - strlcpy(resolved, ".", PATH_MAX); + if (mem_allocated) + free(resolved); + else + strlcpy(resolved, ".", PATH_MAX); return (NULL); } resolved_len = strlen(resolved); @@ -79,7 +103,7 @@ realpath(const char *path, char resolved[PATH_MAX]) } if (left_len >= sizeof(left) || resolved_len >= PATH_MAX) { errno = ENAMETOOLONG; - return (NULL); + goto err; } /* @@ -94,7 +118,7 @@ realpath(const char *path, char resolved[PATH_MAX]) s = p ? p : left + left_len; if (s - left >= (ptrdiff_t)sizeof(next_token)) { errno = ENAMETOOLONG; - return (NULL); + goto err; } memcpy(next_token, left, s - left); next_token[s - left] = '\0'; @@ -104,7 +128,7 @@ realpath(const char *path, char resolved[PATH_MAX]) if (resolved[resolved_len - 1] != '/') { if (resolved_len + 1 >= PATH_MAX) { errno = ENAMETOOLONG; - return (NULL); + goto err; } resolved[resolved_len++] = '/'; resolved[resolved_len] = '\0'; @@ -135,23 +159,23 @@ realpath(const char *path, char resolved[PATH_MAX]) resolved_len = strlcat(resolved, next_token, PATH_MAX); if (resolved_len >= PATH_MAX) { errno = ENAMETOOLONG; - return (NULL); + goto err; } if (lstat(resolved, &sb) != 0) { if (errno == ENOENT && p == NULL) { errno = serrno; return (resolved); } - return (NULL); + goto err; } if (S_ISLNK(sb.st_mode)) { - if (symlinks++ > MAXSYMLINKS) { + if (symlinks++ > SYMLOOP_MAX) { errno = ELOOP; - return (NULL); + goto err; } slen = readlink(resolved, symlink, sizeof(symlink) - 1); if (slen < 0) - return (NULL); + goto err; symlink[slen] = '\0'; if (symlink[0] == '/') { resolved[1] = 0; @@ -174,15 +198,15 @@ realpath(const char *path, char resolved[PATH_MAX]) if (slen + 1 >= (ptrdiff_t)sizeof(symlink)) { errno = ENAMETOOLONG; - return (NULL); + goto err; } symlink[slen] = '/'; symlink[slen + 1] = 0; } - left_len = strlcat(symlink, left, sizeof(left)); - if (left_len >= sizeof(left)) { + left_len = strlcat(symlink, left, sizeof(symlink)); + if (left_len >= sizeof(symlink)) { errno = ENAMETOOLONG; - return (NULL); + goto err; } } left_len = strlcpy(left, symlink, sizeof(left)); @@ -196,5 +220,10 @@ realpath(const char *path, char resolved[PATH_MAX]) if (resolved_len > 1 && resolved[resolved_len - 1] == '/') resolved[resolved_len - 1] = '\0'; return (resolved); + +err: + if (mem_allocated) + free(resolved); + return (NULL); } #endif /* !defined(HAVE_REALPATH) || defined(BROKEN_REALPATH) */ |
