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* [Bug dynamic-link/26076] New: dlclose crashes when cleaning up an empty namespace after dlmopen failure
@ 2020-06-03 11:43 fweimer at redhat dot com
2020-06-04 12:50 ` [Bug dynamic-link/26076] dlmopen crashes when cleaning up an empty namespace in audit mode fweimer at redhat dot com
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2020-06-03 11:43 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26076
Bug ID: 26076
Summary: dlclose crashes when cleaning up an empty namespace
after dlmopen failure
Product: glibc
Version: unspecified
Status: NEW
Severity: minor
Priority: P2
Component: dynamic-link
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
Target Milestone: ---
Flags: security-
If nothing has been loaded, ns->_ns_loaded is NULL and head->l_auditing
attempts to dereference a NULL pointer:
#ifdef SHARED
/* Auditing checkpoint: we have deleted all objects. */
if (__glibc_unlikely (do_audit))
{
struct link_map *head = ns->_ns_loaded;
/* Do not call the functions for any auditing object. */
if (head->l_auditing == 0)
{
struct audit_ifaces *afct = GLRO(dl_audit);
for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
{
if (afct->activity != NULL)
{
struct auditstate *state = link_map_audit_state (head, cnt);
afct->activity (&state->cookie, LA_ACT_CONSISTENT);
}
afct = afct->next;
}
}
}
#endif
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* [Bug dynamic-link/26076] dlmopen crashes when cleaning up an empty namespace in audit mode
2020-06-03 11:43 [Bug dynamic-link/26076] New: dlclose crashes when cleaning up an empty namespace after dlmopen failure fweimer at redhat dot com
@ 2020-06-04 12:50 ` fweimer at redhat dot com
2020-06-04 12:52 ` [Bug dynamic-link/26076] dlmopen crashes after failing to load dependencies " fweimer at redhat dot com
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2020-06-04 12:50 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26076
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fweimer at redhat dot com
Summary|dlclose crashes when |dlmopen crashes when
|cleaning up an empty |cleaning up an empty
|namespace after dlmopen |namespace in audit mode
|failure |
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* [Bug dynamic-link/26076] dlmopen crashes after failing to load dependencies in audit mode
2020-06-03 11:43 [Bug dynamic-link/26076] New: dlclose crashes when cleaning up an empty namespace after dlmopen failure fweimer at redhat dot com
2020-06-04 12:50 ` [Bug dynamic-link/26076] dlmopen crashes when cleaning up an empty namespace in audit mode fweimer at redhat dot com
@ 2020-06-04 12:52 ` fweimer at redhat dot com
2020-06-04 16:20 ` fweimer at redhat dot com
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2020-06-04 12:52 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26076
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at sourceware dot org |fweimer at redhat dot com
Status|NEW |ASSIGNED
Summary|dlmopen crashes when |dlmopen crashes after
|cleaning up an empty |failing to load
|namespace in audit mode |dependencies in audit mode
--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
The cause is slightly different: If dlmopen fails late (in _dl_map_object_deps,
not _dl_map_object), we need to dlclose the initially opened module, and that
crashes in audit mode.
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* [Bug dynamic-link/26076] dlmopen crashes after failing to load dependencies in audit mode
2020-06-03 11:43 [Bug dynamic-link/26076] New: dlclose crashes when cleaning up an empty namespace after dlmopen failure fweimer at redhat dot com
2020-06-04 12:50 ` [Bug dynamic-link/26076] dlmopen crashes when cleaning up an empty namespace in audit mode fweimer at redhat dot com
2020-06-04 12:52 ` [Bug dynamic-link/26076] dlmopen crashes after failing to load dependencies " fweimer at redhat dot com
@ 2020-06-04 16:20 ` fweimer at redhat dot com
2020-07-07 8:12 ` fweimer at redhat dot com
2020-07-07 8:12 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2020-06-04 16:20 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26076
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |NEW
Assignee|fweimer at redhat dot com |unassigned at sourceware dot org
--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
Work has stalled because we probably should rework how namespaces for audit
modules are marked:
https://sourceware.org/pipermail/libc-alpha/2020-June/114771.html
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* [Bug dynamic-link/26076] dlmopen crashes after failing to load dependencies in audit mode
2020-06-03 11:43 [Bug dynamic-link/26076] New: dlclose crashes when cleaning up an empty namespace after dlmopen failure fweimer at redhat dot com
` (2 preceding siblings ...)
2020-06-04 16:20 ` fweimer at redhat dot com
@ 2020-07-07 8:12 ` fweimer at redhat dot com
2020-07-07 8:12 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2020-07-07 8:12 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26076
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Target Milestone|--- |2.32
Resolution|--- |FIXED
--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for glibc 2.32 with:
commit 3ad5dab476205d6e16156cf0511fa6884b3b0fc4
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue Jul 7 09:58:45 2020 +0200
elf: Do not signal LA_ACT_CONSISTENT for an empty namespace [BZ #26076]
The auditing interface identifies namespaces by their first loaded
module. Once the namespace is empty, it is no longer possible to signal
LA_ACT_CONSISTENT for it because the first loaded module is already gone
at that point.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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* [Bug dynamic-link/26076] dlmopen crashes after failing to load dependencies in audit mode
2020-06-03 11:43 [Bug dynamic-link/26076] New: dlclose crashes when cleaning up an empty namespace after dlmopen failure fweimer at redhat dot com
` (3 preceding siblings ...)
2020-07-07 8:12 ` fweimer at redhat dot com
@ 2020-07-07 8:12 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2020-07-07 8:12 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26076
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at sourceware dot org |fweimer at redhat dot com
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end of thread, other threads:[~2020-07-07 8:12 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2020-06-03 11:43 [Bug dynamic-link/26076] New: dlclose crashes when cleaning up an empty namespace after dlmopen failure fweimer at redhat dot com
2020-06-04 12:50 ` [Bug dynamic-link/26076] dlmopen crashes when cleaning up an empty namespace in audit mode fweimer at redhat dot com
2020-06-04 12:52 ` [Bug dynamic-link/26076] dlmopen crashes after failing to load dependencies " fweimer at redhat dot com
2020-06-04 16:20 ` fweimer at redhat dot com
2020-07-07 8:12 ` fweimer at redhat dot com
2020-07-07 8:12 ` fweimer at redhat dot com
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