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fs-util: introduce fchmod_and_chown()

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The new function fchmod_and_chown() is almost same as chmod_and_chown()
except it takes file descriptor instead of file path.
This commit is contained in:
Yu Watanabe 2018-06-14 11:26:29 +09:00
parent 08ebe56b2e
commit b8da477eaf
2 changed files with 17 additions and 0 deletions
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16
src/basic/fs-util.c
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@ -230,6 +230,22 @@ int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
return 0;
}
int fchmod_and_chown(int fd, mode_t mode, uid_t uid, gid_t gid) {
/* Under the assumption that we are running privileged we
* first change the access mode and only then hand out
* ownership to avoid a window where access is too open. */
if (mode != MODE_INVALID)
if (fchmod(fd, mode) < 0)
return -errno;
if (uid != UID_INVALID || gid != GID_INVALID)
if (fchown(fd, uid, gid) < 0)
return -errno;
return 0;
}
int fchmod_umask(int fd, mode_t m) {
mode_t u;
int r;

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

@ -31,6 +31,7 @@ int readlink_value(const char *p, char **ret);
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_and_chown(int fd, 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);