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[Bug corefiles/11804] New: Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: "jan dot kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: 10 Jul 2010 21:14:33 -0000
- Subject: [Bug corefiles/11804] New: Fix -Wl,-z,relro gcore writer (+maybe reader)
- Reply-to: sourceware-bugzilla at sourceware dot org
Core files for -Wl,-z,relro generated by:
kernel-2.6.33.5-124.fc13.x86_64
kernel-xen-2.6.18-194.8.1.el5.x86_64
works correctly because:
Roland McGrath:
------------------------------------------------------------------------------
The kernel's default rules dump any MAP_PRIVATE file mapping that has
actually been modified (i.e. COW performed), so you should always have
.dynamic and all other parts of any data sgements that were written to,
regardless of their page protections at the time of the dump.
------------------------------------------------------------------------------
Core files generated by GDB gcore do not contain page containing DYNAMIC
containing DT_DEBUG pointing at _r_debug, therefore GDB cannot later find out
the shared library list.
(a) Fix gcore:
Roland McGrath:
------------------------------------------------------------------------------
gdb/gcore could do something similar from userland if it looks at
/proc/pid/smaps. I think you can say that any non-shared mapping listed
with either Private_Dirty or Swap nonzero is one's that's been written to.
But we should probably double-check with the kernel VM people.
------------------------------------------------------------------------------
(b) We can possibly make GDB compatible even with current broken gcore by
a hack depending on unique `_r_debug' symbol. [patch attached]
--
Summary: Fix -Wl,-z,relro gcore writer (+maybe reader)
Product: gdb
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: corefiles
AssignedTo: unassigned at sourceware dot org
ReportedBy: jan dot kratochvil at redhat dot com
CC: gdb-prs at sourceware dot org
GCC target triplet: x86_64-unknown-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=11804
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- Follow-Ups:
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: jan dot kratochvil at redhat dot com
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: jan dot kratochvil at redhat dot com
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: jan dot kratochvil at redhat dot com
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: jan dot kratochvil at redhat dot com
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: jan dot kratochvil at redhat dot com
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: jan dot kratochvil at redhat dot com
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: jan dot kratochvil at redhat dot com
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: rguenth at gcc dot gnu dot org
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: rguenth at gcc dot gnu dot org
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: rguenth at gcc dot gnu dot org
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: rguenth at gcc dot gnu dot org
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: rguenth at gcc dot gnu dot org
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: rguenth at gcc dot gnu dot org
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: jan dot kratochvil at redhat dot com
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: rguenth at gcc dot gnu dot org
- [Bug corefiles/11804] Fix -Wl,-z,relro gcore writer (+maybe reader)
- From: jan dot kratochvil at redhat dot com