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store: Fix potential over-reads in 'import-paths'.

Previously 'process-stderr' would always pass a bytevector of MAX-LEN to
then daemon in the %stderr-read case (i.e., 'import-paths'), instead of
LEN (where LEN <= MAX-LEN).

In practice the extra bytes didn't cause a protocol violation or
anything because they happen at the end of the stream, which typically
contains the canonical sexp of the signature, and the extra zeros were
just ignored.

* guix/serialization.scm (write-bytevector): Add optional 'l' parameter
and honor it.
* guix/store.scm (process-stderr): Pass LEN to 'write-bytevector'.
python-updates
Ludovic Courtès 4 years ago
parent
commit
39d1e9654c
No known key found for this signature in database GPG Key ID: 90B11993D9AEBB5
  1. 8
      guix/serialization.scm
  2. 2
      guix/store.scm

8
guix/serialization.scm

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -102,9 +102,9 @@
(or (zero? m)
(put-bytevector p zero 0 (- 8 m)))))))
(define (write-bytevector s p)
(let* ((l (bytevector-length s))
(m (modulo l 8))
(define* (write-bytevector s p
#:optional (l (bytevector-length s)))
(let* ((m (modulo l 8))
(b (make-bytevector (+ 8 l (if (zero? m) 0 (- 8 m))))))
(bytevector-u32-set! b 0 l (endianness little))
(bytevector-copy! s 0 b 8 l)

2
guix/store.scm

@ -609,7 +609,7 @@ encoding conversion errors."
(let* ((max-len (read-int p))
(data (make-bytevector max-len))
(len (get-bytevector-n! user-port data 0 max-len)))
(write-bytevector data p)
(write-bytevector data p len)
#f))
((= k %stderr-next)
;; Log a string. Build logs are usually UTF-8-encoded, but they

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