12e448c1be
- makedumpfile-sadump-fix-PTI-enabled-kernels.patch: sadump: Fix a problem of PTI enabled kernel (bsc#1085826). OBS-URL: https://build.opensuse.org/request/show/588588 OBS-URL: https://build.opensuse.org/package/show/Kernel:kdump/makedumpfile?expand=0&rev=117
72 lines
2.4 KiB
Diff
72 lines
2.4 KiB
Diff
From: Takao Indoh <indou.takao@jp.fujitsu.com>
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Date: Fri, 26 Jan 2018 09:22:26 +0900
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Subject: sadump: Fix a problem of PTI enabled kernel
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References: bsc#1085826
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Upstream: submitted
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Message-ID: <1516926146-20347-1-git-send-email-indou.takao@jp.fujitsu.com>
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This patch fixes a problme that a dumpfile of sadump cannot be handled by
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makedumpfile when Page Table Isolation(PTI) is enabled.
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When PTI is enabled, bit 12 of CR3 register is used to split user space and
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kernel space. Also bit 11:0 is used for Process Context IDentifiers(PCID). To
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open a dump file of sadump, a value of CR3 is used to calculate KASLR offset and
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phys_base, therefore this patch fixes to mask CR3 register value collectly for
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PTI enabled kernel.
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Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
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Acked-by: Petr Tesarik <ptesarik@suse.com>
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---
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makedumpfile.c | 2 ++
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makedumpfile.h | 2 ++
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sadump_info.c | 9 ++++++++-
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3 files changed, 12 insertions(+), 1 deletion(-)
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--- a/makedumpfile.c
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+++ b/makedumpfile.c
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@@ -1572,6 +1572,8 @@ get_symbol_info(void)
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SYMBOL_INIT(divide_error, "divide_error");
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SYMBOL_INIT(idt_table, "idt_table");
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SYMBOL_INIT(saved_command_line, "saved_command_line");
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+ SYMBOL_INIT(pti_init, "pti_init");
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+ SYMBOL_INIT(kaiser_init, "kaiser_init");
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return TRUE;
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}
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--- a/makedumpfile.h
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+++ b/makedumpfile.h
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@@ -1606,6 +1606,8 @@ struct symbol_table {
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unsigned long long divide_error;
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unsigned long long idt_table;
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unsigned long long saved_command_line;
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+ unsigned long long pti_init;
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+ unsigned long long kaiser_init;
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/*
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* symbols on ppc64 arch
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--- a/sadump_info.c
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+++ b/sadump_info.c
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@@ -1362,6 +1362,9 @@ finish:
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* kernel. Retrieve vmcoreinfo from address of "elfcorehdr=" and
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* get kaslr_offset and phys_base from vmcoreinfo.
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*/
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+#define PTI_USER_PGTABLE_BIT (info->page_shift)
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+#define PTI_USER_PGTABLE_MASK (1 << PTI_USER_PGTABLE_BIT)
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+#define CR3_PCID_MASK 0xFFFull
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int
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calc_kaslr_offset(void)
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{
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@@ -1389,7 +1392,11 @@ calc_kaslr_offset(void)
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}
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idtr = ((uint64_t)smram.IdtUpper)<<32 | (uint64_t)smram.IdtLower;
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- cr3 = smram.Cr3;
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+ if ((SYMBOL(pti_init) != NOT_FOUND_SYMBOL) ||
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+ (SYMBOL(kaiser_init) != NOT_FOUND_SYMBOL))
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+ cr3 = smram.Cr3 & ~(CR3_PCID_MASK|PTI_USER_PGTABLE_MASK);
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+ else
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+ cr3 = smram.Cr3 & ~CR3_PCID_MASK;
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/* Convert virtual address of IDT table to physical address */
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if ((idtr_paddr = vtop4_x86_64_pagetable(idtr, cr3)) == NOT_PADDR)
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