diff options
Diffstat (limited to 'libsandbox/wrapper-funcs/__openat_2.c')
| -rw-r--r-- | libsandbox/wrapper-funcs/__openat_2.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/libsandbox/wrapper-funcs/__openat_2.c b/libsandbox/wrapper-funcs/__openat_2.c new file mode 100644 index 0000000..3384b93 --- /dev/null +++ b/libsandbox/wrapper-funcs/__openat_2.c @@ -0,0 +1,44 @@ +/* + * __openat_2() wrapper (_FORTIFY_SOURCE). + * + * Copyright 1999-2009 Gentoo Foundation + * Licensed under the GPL-2 + */ + +#ifndef WRAPPER_ARGS_PROTO /* let open() use us */ +# define WRAPPER_ARGS_PROTO int dirfd, const char *pathname, int flags +# define WRAPPER_ARGS dirfd, pathname, flags +# define WRAPPER_SAFE() FUNCTION_SANDBOX_SAFE_OPEN_INT_AT(dirfd, pathname, flags) +# define USE_AT 1 +#else +# define USE_AT 0 +#endif + +#ifndef PRE_CHECK_FUNC +# define _PRE_CHECK_FUNC(x) sb_##x##_pre_check +# define PRE_CHECK_FUNC(x) _PRE_CHECK_FUNC(x) +#endif +static inline bool PRE_CHECK_FUNC(WRAPPER_NAME)(WRAPPER_ARGS_PROTO) +{ + if (!(flags & O_CREAT)) { + save_errno(); + + /* If we're not trying to create, fail normally if + * file does not stat + */ + struct stat st; +#if USE_AT + if (dirfd == AT_FDCWD || pathname[0] == '/') +#endif +#undef USE_AT + if (-1 == stat(pathname, &st)) + return false; + + restore_errno(); + } + + return true; +} +#define WRAPPER_PRE_CHECKS() PRE_CHECK_FUNC(WRAPPER_NAME)(WRAPPER_ARGS) + +#include "__wrapper_simple.c" |