diff options
| author | Ludovic Courtès <ludo@gnu.org> | 2022-09-12 14:29:45 +0200 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2022-09-13 00:31:04 +0200 |
| commit | 66fdaf3677e5f7833a02096a2bcb1e9653efbb16 (patch) | |
| tree | a44aeda93ebf6535b21654f8be3ec113aa38931a /gnu/services | |
| parent | 32583c8c20b1b55b3d5289af691791749edd5e6f (diff) | |
services: shepherd: Install O_CLOEXEC variant of 'call-with-input-file' & co.
Fixes a bug introduced with the Shepherd 0.9.2 upgrade in commit
1ba0e38267c9ff8bb476285091be6e297bbf136e whereby files opened by, say,
the 'start' method of 'urandom-seed', could leak into the execution
environment of some other service--e.g., 'term-tty4'.
* gnu/services/shepherd.scm (shepherd-configuration-file)[config]:
Override 'call-with-input-file' and 'call-with-output-file'.
Diffstat (limited to 'gnu/services')
| -rw-r--r-- | gnu/services/shepherd.scm | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/gnu/services/shepherd.scm b/gnu/services/shepherd.scm index a8f6db9ce2..61f759a19d 100644 --- a/gnu/services/shepherd.scm +++ b/gnu/services/shepherd.scm @@ -344,6 +344,31 @@ as shepherd package." (use-modules (srfi srfi-34) (system repl error-handling)) + (define (call-with-file file flags proc) + (let ((port #f)) + (dynamic-wind + (lambda () + (set! port (open file flags))) + (lambda () + (proc port)) + (lambda () + (close-port port) + (set! port #f))))) + + ;; There's code run from shepherd that uses 'call-with-input-file' & + ;; co.--e.g., the 'urandom-seed' service. Starting from Shepherd + ;; 0.9.2, users need to make sure not to leak non-close-on-exec file + ;; descriptors to child processes. To address that, replace the + ;; standard bindings with O_CLOEXEC variants. + (set! call-with-input-file + (lambda (file proc) + (call-with-file file (logior O_RDONLY O_CLOEXEC) + proc))) + (set! call-with-output-file + (lambda (file proc) + (call-with-file file (logior O_WRONLY O_CREAT O_CLOEXEC) + proc))) + ;; Specify the default environment visible to all the services. ;; Without this statement, all the environment variables of PID 1 ;; are inherited by child services. |