39 lines
1.3 KiB
Diff
39 lines
1.3 KiB
Diff
This patch fix a problem that crash cannot open a dumpfile which is
|
|
captured by sadump in KASLR enabled kernel.
|
|
|
|
When KASLR feature is enabled, a kernel is placed on the memory randomly
|
|
and therefore crash cannot open a dumpfile captured by sadump because
|
|
addresses of kernel symbols in System.map or vmlinux are different from
|
|
actual addresses.
|
|
|
|
To solve this problem, we need to calculate kaslr offset(the difference
|
|
between original symbol address and actual address) and phys_base, and
|
|
adjust symbol table of crash. In the case of dumpfile of kdump, these
|
|
information is included in the header, but dumpfile of sadump does not
|
|
have such a information.
|
|
|
|
This patch calculate kaslr offset and phys_base to solve this problem.
|
|
Please see the comment in the calc_kaslr_offset() for the detail idea.
|
|
The basic idea is getting register (IDTR and CR3) from dump header, and
|
|
calculate kaslr_offset/phys_base using them.
|
|
|
|
Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
|
|
---
|
|
symbols.c | 3 +++
|
|
1 file changed, 3 insertions(+)
|
|
|
|
Index: b/symbols.c
|
|
===================================================================
|
|
--- a/symbols.c
|
|
+++ b/symbols.c
|
|
@@ -1209,6 +1209,9 @@ symname_hash_install(struct syment *spn)
|
|
}
|
|
}
|
|
}
|
|
+
|
|
+ if (SADUMP_DUMPFILE())
|
|
+ kt->flags2 |= KASLR_CHECK;
|
|
}
|
|
|
|
/*
|