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fs-util: introduce fchmod_opath()

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fchmod(2) still doesn't take file descriptors opened with O_PATH.
This commit is contained in:
Franck Bui 2018-04-11 16:58:49 +02:00
parent 7b887f2284
commit 4dfaa528d4
3 changed files with 18 additions and 8 deletions
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15
src/basic/fs-util.c
View File

@ -241,6 +241,21 @@ int fchmod_umask(int fd, mode_t m) {
return r;
}
int fchmod_opath(int fd, mode_t m) {
char procfs_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
/* This function operates also on fd that might have been opened with
* O_PATH. Indeed fchmodat() doesn't have the AT_EMPTY_PATH flag like
* fchownat() does. */
xsprintf(procfs_path, "/proc/self/fd/%i", fd);
if (chmod(procfs_path, m) < 0)
return -errno;
return 0;
}
int fd_warn_permissions(const char *path, int fd) {
struct stat st;

1
src/basic/fs-util.h
View File

@ -33,6 +33,7 @@ int readlink_and_make_absolute(const char *p, char **r);
int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
int fchmod_umask(int fd, mode_t mode);
int fchmod_opath(int fd, mode_t m);
int fd_warn_permissions(const char *path, int fd);

10
src/tmpfiles/tmpfiles.c
View File

@ -808,15 +808,9 @@ static int fd_set_perms(Item *i, int fd, const struct stat *st) {
if (m == (st->st_mode & 07777))
log_debug("\"%s\" has correct mode %o already.", path, st->st_mode);
else {
char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
log_debug("Changing \"%s\" to mode %o.", path, m);
/* fchmodat() still doesn't have AT_EMPTY_PATH flag. */
xsprintf(procfs_path, "/proc/self/fd/%i", fd);
if (chmod(procfs_path, m) < 0)
return log_error_errno(errno, "chmod() of %s via %s failed: %m", path, procfs_path);
if (fchmod_opath(fd, m) < 0)
return log_error_errno(errno, "fchmod() of %s failed: %m", path);
}
}
}