diff options
| author | Luca Boccassi <luca.boccassi@gmail.com> | 2026-01-27 22:51:37 +0000 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2026-02-02 09:52:26 +0100 |
| commit | ab89060fbc92edd6e852bf0f533f29140afabe0e (patch) | |
| tree | 64049bd09898db0fbce9d2d6ca8ae0fab42da1d8 | |
| parent | b3c78bc53630d14a5770451ede3a30e7052f3b8b (diff) | |
pidfs: return -EREMOTE when PIDFD_GET_INFO is called on another ns
Currently it is not possible to distinguish between the case where a
process has already exited and the case where a process is in a
different namespace, as both return -ESRCH.
glibc's pidfd_getpid() procfs-based implementation returns -EREMOTE
in the latter, so that distinguishing the two is possible, as the
fdinfo in procfs will list '0' as the PID in that case:
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/pidfd_getpid.c;h=860829cf07da2267484299ccb02861822c0d07b4;hb=HEAD#l121
Change the error code so that the kernel also returns -EREMOTE in
that case.
Fixes: 7477d7dce48a ("pidfs: allow to retrieve exit information")
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>
Link: https://patch.msgid.link/20260127225209.2293342-1-luca.boccassi@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
| -rw-r--r-- | fs/pidfs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/pidfs.c b/fs/pidfs.c index dba703d4ce4a..8e66d3993dd8 100644 --- a/fs/pidfs.c +++ b/fs/pidfs.c @@ -329,7 +329,7 @@ static long pidfd_info(struct file *file, unsigned int cmd, unsigned long arg) * namespace hierarchy. */ if (!pid_in_current_pidns(pid)) - return -ESRCH; + return -EREMOTE; attr = READ_ONCE(pid->attr); if (mask & PIDFD_INFO_EXIT) { |