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file_utils: add open_at_same()

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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner
2021-07-30 13:02:01 +02:00
parent f6370f2ac2
commit 9910185a80
2 changed files with 18 additions and 0 deletions
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15
src/lxc/file_utils.c
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@@ -670,6 +670,21 @@ int open_at(int dfd, const char *path, unsigned int o_flags,
return move_fd(fd); return move_fd(fd);
} }
int open_at_same(int fd_same, int dfd, const char *path, unsigned int o_flags,
unsigned int resolve_flags, mode_t mode)
{
__do_close int fd = -EBADF;
fd = open_at(dfd, path, o_flags, resolve_flags, mode);
if (fd < 0)
return -errno;
if (!same_file_lax(fd_same, fd))
return ret_errno(EINVAL);
return move_fd(fd);
}
int fd_make_nonblocking(int fd) int fd_make_nonblocking(int fd)
{ {
int flags; int flags;

3
src/lxc/file_utils.h
View File

@@ -87,6 +87,9 @@ __hidden extern bool exists_dir_at(int dir_fd, const char *path);
__hidden extern bool exists_file_at(int dir_fd, const char *path); __hidden extern bool exists_file_at(int dir_fd, const char *path);
__hidden extern int open_at(int dfd, const char *path, unsigned int o_flags, __hidden extern int open_at(int dfd, const char *path, unsigned int o_flags,
unsigned int resolve_flags, mode_t mode); unsigned int resolve_flags, mode_t mode);
__hidden extern int open_at_same(int fd_same, int dfd, const char *path,
unsigned int o_flags,
unsigned int resolve_flags, mode_t mode);
static inline int open_beneath(int dfd, const char *path, unsigned int flags) static inline int open_beneath(int dfd, const char *path, unsigned int flags)
{ {
return open_at(dfd, path, flags, PROTECT_LOOKUP_BENEATH, 0); return open_at(dfd, path, flags, PROTECT_LOOKUP_BENEATH, 0);