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* bug#41204: port-revealed count is initially > 30000
@ 2020-05-12 10:32 Caleb Ristvedt
  2020-05-12 13:04 ` Ludovic Courtès
  0 siblings, 1 reply; 2+ messages in thread
From: Caleb Ristvedt @ 2020-05-12 10:32 UTC (permalink / raw)
  To: 41204


(port-revealed (open-input-file "/dev/null"))
=> 32539

The little investigating I've done so far suggests that this is because
scm_i_fdes_to_port calls scm_gc_malloc_pointerless and initializes only
the 'fdes' and 'options' fields, leaving 'revealed' uninitialized. The
comment above scm_gc_malloc_pointerless does a good job of explaining
why this is an issue:

/* Allocate SIZE bytes of memory whose contents should not be scanned
   for pointers (useful, e.g., for strings).  Note though that this
   memory is *not* cleared; be sure to initialize it to prevent
   information leaks.  */

This issue appears to be present both in the 2.2 and 3.0 releases
packaged in guix.

- reepca





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2020-05-12 10:32 bug#41204: port-revealed count is initially > 30000 Caleb Ristvedt
2020-05-12 13:04 ` Ludovic Courtès

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