[Bug 1560899] Re: sqlite triggers syscall error if run as root in snappy default confinement (fchown not allowed)

[Oliver Grawert]

** Changed in: sqlite3 (Ubuntu)
       Status: New => Confirmed

** Changed in: sqlite3 (Ubuntu)
   Importance: Undecided => High

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Title:
  sqlite triggers syscall error if run as root in snappy default
  confinement (fchown not allowed)

Status in sqlite3 package in Ubuntu:
  Confirmed

Bug description:
  Code currently tries to change user to uid if geteuid is root; this
  call triggers fchown syscall exception in snappy.

  Good news is that in snappy this call is a null op in theory as both
  geteuid as well as uid are 0, so changing wouldnt do anything.

  Fix is to not try to chown if geteuid is equal to uid (e.g. if it
  would be a null op anyway). "Safe" patch should be:

  Index: sqlite3-3.11.0/src/os_unix.c
  ===================================================================
  --- sqlite3-3.11.0.orig/src/os_unix.c
  +++ sqlite3-3.11.0/src/os_unix.c
  @@ -497,7 +497,7 @@ static struct unix_syscall {
   */
   static int robustFchown(int fd, uid_t uid, gid_t gid){
   #if defined(HAVE_FCHOWN)
  -  return osGeteuid() ? 0 : osFchown(fd,uid,gid);
  +  return osGeteuid() || osGeteuid() == uid ? 0 : osFchown(fd,uid,gid);
   #else
     return 0;
   #endif

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