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services: shepherd: Install O_CLOEXEC variant of 'call-with-input-file' & co.

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Fixes a bug introduced with the Shepherd 0.9.2 upgrade in commit
1ba0e38267 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'.
This commit is contained in:
Ludovic Courtès 2022-09-12 14:29:45 +02:00
parent 32583c8c20
commit 66fdaf3677
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1 changed files with 25 additions and 0 deletions
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gnu/services/shepherd.scm
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@ -344,6 +344,31 @@ (define config
(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.