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egg: Request that secure memory not be dumped to disk

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Linux 3.4 added support for the MADV_DONTDUMP option to madvise(), which
requests that the covered memory not be included in coredumps. It makes
sense to use this to prevent cases where application crashes could
result in secrets being persisted to disk or included in dumps that are
uploaded to remote servers for analysis. I've avoided making this fatal
since there's a chance this code could be built on systems that have
MADV_DONTDUMP but run on systems that don't.
This commit is contained in:
Matthew Garrett 2019-04-19 13:08:32 -07:00 committed by Daiki Ueno
parent 529758c153
commit fb813abe5c
1 changed files with 13 additions and 0 deletions
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13
egg/egg-secure-memory.c
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@ -885,6 +885,19 @@ sec_acquire_pages (size_t *sz,
DEBUG_ALLOC ("gkr-secure-memory: new block ", *sz); DEBUG_ALLOC ("gkr-secure-memory: new block ", *sz);
#if defined(MADV_DONTDUMP)
if (madvise (pages, *sz, MADV_DONTDUMP) < 0) {
if (show_warning && egg_secure_warnings) {
/*
* Not fatal - this was added in Linux 3.4 and older
* kernels will legitimately fail this at runtime
*/
fprintf (stderr, "couldn't MADV_DONTDUMP %lu bytes of memory (%s): %s\n",
(unsigned long)*sz, during_tag, strerror (errno));
}
}
#endif
show_warning = 1; show_warning = 1;
return pages; return pages;