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