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Accepting request 562833 from home:ptesarik:branches:Kernel:kdump

Browse Source 
- makedumpfile-__cpu_online_mask-symbol.patch: Support symbol
  __cpu_online_mask (FATE#323473, bsc#1070291).
- makedumpfile-vtop4_x86_64_pagetable.patch: Introduce
  vtop4_x86_64_pagetable (FATE#323473, bsc#1070291).
- makedumpfile-fix-KASLR-for-sadump.patch: Fix a KASLR problem of
  sadump (FATE#323473, bsc#1070291).
- makedumpfile-fix-KASLR-for-sadump-while-kdump.patch: sadump: Fix
  a KASLR problem of sadump while kdump is working (FATE#323473,
  bsc#1070291).

OBS-URL: https://build.opensuse.org/request/show/562833
OBS-URL: https://build.opensuse.org/package/show/Kernel:kdump/makedumpfile?expand=0&rev=113
This commit is contained in:
Petr Tesařík 2018-01-09 10:34:26 +00:00 committed by Git OBS Bridge
parent e4d35d5e02
commit 4877ee4b98
11 changed files with 821 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
makedumpfile-Fix-SECTION_MAP_MASK-for-kernel-v.13.patch
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@ -1,8 +1,9 @@
From: Pratyush Anand <panand@redhat.com>
Date: Thu, 17 Aug 2017 12:47:13 +0900
Subject: [PATCH v2] Fix SECTION_MAP_MASK for kernel >= v.13
Patch-mainline: yes
Subject: Fix SECTION_MAP_MASK for kernel >= v.13
References: bnc#1066811, bsc#1067703
Upstream: merged
Git-commit: a02f5f078ce635dd1633dab70869306b0a62e2e2
* Required for kernel 4.13
* Required for SLE15 kernel due to backport of 2d070eab2e82 => 4.12

63
makedumpfile-__cpu_online_mask-symbol.patch Normal file
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@ -0,0 +1,63 @@
From: Takao Indoh <indou.takao@jp.fujitsu.com>
Date: Thu, 26 Oct 2017 20:32:48 +0900
Subject: Support symbol __cpu_online_mask
References: FATE#323473, bsc#1070291
Upstream: merged
Git-commit: d6d5b443c82471818d43cb87c9280a0252e763e7
In the upstream kernel, by commit 5aec01b83 cpu_online_mask was replaced
with macros and new variables __cpu_online_mask was added instead of it.
Sadump uses cpu_online_mask to check the cpu was online or not,
therefore it also need __cpu_online_mask symbol for this in the latest
kernel.
Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
makedumpfile.c | 9 +++++++--
makedumpfile.h | 1 +
sadump_info.c | 3 ++-
3 files changed, 10 insertions(+), 3 deletions(-)
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -1519,8 +1519,13 @@ get_symbol_info(void)
SYMBOL_INIT(__per_cpu_load, "__per_cpu_load");
SYMBOL_INIT(__per_cpu_offset, "__per_cpu_offset");
SYMBOL_INIT(cpu_online_mask, "cpu_online_mask");
- if (SYMBOL(cpu_online_mask) == NOT_FOUND_SYMBOL)
- SYMBOL_INIT(cpu_online_mask, "cpu_online_map");
+ SYMBOL_INIT(__cpu_online_mask, "__cpu_online_mask");
+ if (SYMBOL(cpu_online_mask) == NOT_FOUND_SYMBOL) {
+ if (SYMBOL(__cpu_online_mask) == NOT_FOUND_SYMBOL)
+ SYMBOL_INIT(cpu_online_mask, "cpu_online_map");
+ else
+ SYMBOL_INIT(cpu_online_mask, "__cpu_online_mask");
+ }
SYMBOL_INIT(kexec_crash_image, "kexec_crash_image");
SYMBOL_INIT(node_remap_start_vaddr, "node_remap_start_vaddr");
SYMBOL_INIT(node_remap_end_vaddr, "node_remap_end_vaddr");
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -1590,6 +1590,7 @@ struct symbol_table {
unsigned long long __per_cpu_offset;
unsigned long long __per_cpu_load;
unsigned long long cpu_online_mask;
+ unsigned long long __cpu_online_mask;
unsigned long long kexec_crash_image;
/*
--- a/sadump_info.c
+++ b/sadump_info.c
@@ -953,7 +953,8 @@ cpu_online_mask_init(void)
return FALSE;
}
- if (SIZE(cpumask) == NOT_FOUND_STRUCTURE)
+ if ((SIZE(cpumask) == NOT_FOUND_STRUCTURE) ||
+ (SYMBOL(__cpu_online_mask) != NOT_FOUND_SYMBOL))
cpu_online_mask_addr = SYMBOL(cpu_online_mask);
else {

8
makedumpfile-book3s-ppc64-Lower-the-max-real-address-to-53-bits.patch
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@ -1,11 +1,11 @@
From dc28bfc3213960b549bcc70f0d5379a6222d2c60 Mon Sep 17 00:00:00 2001
From: Bhupesh Sharma <bhsharma@redhat.com>
Date: Wed, 13 Sep 2017 05:04:00 +0900
Subject: [PATCH] [PATCH v2] book3s/ppc64: Lower the max real address to 53
Subject: book3s/ppc64: Lower the max real address to 53
bits for kernels >= v4.11
Patch-mainline: yes
References: bsc#1067703
Upstream: merged
Git-commit: dc28bfc3213960b549bcc70f0d5379a6222d2c60
* Required for kernel 4.11
Kernel commit 2f18d533757da3899f4bedab0b2c051b080079dc lowered the

353
makedumpfile-fix-KASLR-for-sadump-while-kdump.patch Normal file
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@ -0,0 +1,353 @@
From: Takao Indoh <indou.takao@jp.fujitsu.com>
Date: Thu, 26 Oct 2017 20:33:01 +0900
Subject: sadump: Fix a KASLR problem of sadump while kdump is working
References: FATE#323473, bsc#1070291
Upstream: merged
Git-commit: 09288f2058c8066a2729588ec668eed3e1140028
In the calc_kaslr_offset(), kaslr_offset and phys_base are calculated
using IDTR and CR3, but this solution does not work in the following
cases.
1) If the dump is captured on early stage of kernel boot, IDTR points
early IDT table(early_idts) instead of normal IDT(idt_table).
2) If the dump is captured whle kdump is working, IDTR points IDT table
of 2nd kernel, not 1st kernel.
This patch fixes the case 2). Current implementation does not support
the case 1), need enhancement in the future. This patch gets kernel boot
parameter from "saved_command_line" and check if "elfcorehdr=" is
included in the parameter. If it's included, we are in the 2nd kernel.
Retrieve vmcoreinfo from address of "elfcorehdr=" and get kaslr_offset
and phys_base from vmcoreinfo.
Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
makedumpfile.c | 1
makedumpfile.h | 1
sadump_info.c | 271 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 273 insertions(+)
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -1556,6 +1556,7 @@ get_symbol_info(void)
SYMBOL_INIT(divide_error, "divide_error");
SYMBOL_INIT(idt_table, "idt_table");
+ SYMBOL_INIT(saved_command_line, "saved_command_line");
return TRUE;
}
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -1596,6 +1596,7 @@ struct symbol_table {
unsigned long long kexec_crash_image;
unsigned long long divide_error;
unsigned long long idt_table;
+ unsigned long long saved_command_line;
/*
* symbols on ppc64 arch
--- a/sadump_info.c
+++ b/sadump_info.c
@@ -1059,6 +1059,241 @@ get_vec0_addr(ulong idtr)
}
/*
+ * Parse a string of [size[KMG]@]offset[KMG]
+ * Import from Linux kernel(lib/cmdline.c)
+ */
+static ulong memparse(char *ptr, char **retptr)
+{
+ char *endptr;
+
+ unsigned long long ret = strtoull(ptr, &endptr, 0);
+
+ switch (*endptr) {
+ case 'E':
+ case 'e':
+ ret <<= 10;
+ case 'P':
+ case 'p':
+ ret <<= 10;
+ case 'T':
+ case 't':
+ ret <<= 10;
+ case 'G':
+ case 'g':
+ ret <<= 10;
+ case 'M':
+ case 'm':
+ ret <<= 10;
+ case 'K':
+ case 'k':
+ ret <<= 10;
+ endptr++;
+ default:
+ break;
+ }
+
+ if (retptr)
+ *retptr = endptr;
+
+ return ret;
+}
+
+/*
+ * Find "elfcorehdr=" in the boot parameter of kernel and return the address
+ * of elfcorehdr.
+ */
+static ulong
+get_elfcorehdr(ulong cr3)
+{
+ char cmdline[BUFSIZE], *ptr;
+ ulong cmdline_vaddr;
+ ulong cmdline_paddr;
+ ulong buf_vaddr, buf_paddr;
+ char *end;
+ ulong elfcorehdr_addr = 0, elfcorehdr_size = 0;
+
+ if (SYMBOL(saved_command_line) == NOT_FOUND_SYMBOL) {
+ ERRMSG("Can't get the symbol of saved_command_line.\n");
+ return 0;
+ }
+ cmdline_vaddr = SYMBOL(saved_command_line);
+ if ((cmdline_paddr = vtop4_x86_64_pagetable(cmdline_vaddr, cr3)) == NOT_PADDR)
+ return 0;
+
+ DEBUG_MSG("sadump: cmdline vaddr: %lx\n", cmdline_vaddr);
+ DEBUG_MSG("sadump: cmdline paddr: %lx\n", cmdline_paddr);
+
+ if (!readmem(PADDR, cmdline_paddr, &buf_vaddr, sizeof(ulong)))
+ return 0;
+
+ if ((buf_paddr = vtop4_x86_64_pagetable(buf_vaddr, cr3)) == NOT_PADDR)
+ return 0;
+
+ DEBUG_MSG("sadump: cmdline buf vaddr: %lx\n", buf_vaddr);
+ DEBUG_MSG("sadump: cmdline buf paddr: %lx\n", buf_paddr);
+
+ memset(cmdline, 0, BUFSIZE);
+ if (!readmem(PADDR, buf_paddr, cmdline, BUFSIZE))
+ return 0;
+
+ ptr = strstr(cmdline, "elfcorehdr=");
+ if (!ptr)
+ return 0;
+
+ DEBUG_MSG("sadump: 2nd kernel detected.\n");
+
+ ptr += strlen("elfcorehdr=");
+ elfcorehdr_addr = memparse(ptr, &end);
+ if (*end == '@') {
+ elfcorehdr_size = elfcorehdr_addr;
+ elfcorehdr_addr = memparse(end + 1, &end);
+ }
+
+ DEBUG_MSG("sadump: elfcorehdr_addr: %lx\n", elfcorehdr_addr);
+ DEBUG_MSG("sadump: elfcorehdr_size: %lx\n", elfcorehdr_size);
+
+ return elfcorehdr_addr;
+}
+
+/*
+ * Get vmcoreinfo from elfcorehdr.
+ * Some codes are imported from Linux kernel(fs/proc/vmcore.c)
+ */
+static int
+get_vmcoreinfo_in_kdump_kernel(ulong elfcorehdr, ulong *addr, int *len)
+{
+ unsigned char e_ident[EI_NIDENT];
+ Elf64_Ehdr ehdr;
+ Elf64_Phdr phdr;
+ Elf64_Nhdr nhdr;
+ ulong ptr;
+ ulong nhdr_offset = 0;
+ int i;
+
+ if (!readmem(PADDR, elfcorehdr, e_ident, EI_NIDENT))
+ return FALSE;
+
+ if (e_ident[EI_CLASS] != ELFCLASS64) {
+ ERRMSG("Only ELFCLASS64 is supportd\n");
+ return FALSE;
+ }
+
+ if (!readmem(PADDR, elfcorehdr, &ehdr, sizeof(ehdr)))
+ return FALSE;
+
+ /* Sanity Check */
+ if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
+ (ehdr.e_type != ET_CORE) ||
+ ehdr.e_ident[EI_CLASS] != ELFCLASS64 ||
+ ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
+ ehdr.e_version != EV_CURRENT ||
+ ehdr.e_ehsize != sizeof(Elf64_Ehdr) ||
+ ehdr.e_phentsize != sizeof(Elf64_Phdr) ||
+ ehdr.e_phnum == 0) {
+ ERRMSG("Invalid elf header\n");
+ return FALSE;
+ }
+
+ ptr = elfcorehdr + ehdr.e_phoff;
+ for (i = 0; i < ehdr.e_phnum; i++) {
+ ulong offset;
+ char name[16];
+
+ if (!readmem(PADDR, ptr, &phdr, sizeof(phdr)))
+ return FALSE;
+
+ ptr += sizeof(phdr);
+ if (phdr.p_type != PT_NOTE)
+ continue;
+
+ offset = phdr.p_offset;
+ if (!readmem(PADDR, offset, &nhdr, sizeof(nhdr)))
+ return FALSE;
+
+ offset += divideup(sizeof(Elf64_Nhdr), sizeof(Elf64_Word))*
+ sizeof(Elf64_Word);
+ memset(name, 0, sizeof(name));
+ if (!readmem(PADDR, offset, name, sizeof(name)))
+ return FALSE;
+
+ if(!strcmp(name, "VMCOREINFO")) {
+ nhdr_offset = offset;
+ break;
+ }
+ }
+
+ if (!nhdr_offset)
+ return FALSE;
+
+ *addr = nhdr_offset +
+ divideup(nhdr.n_namesz, sizeof(Elf64_Word))*
+ sizeof(Elf64_Word);
+ *len = nhdr.n_descsz;
+
+ DEBUG_MSG("sadump: vmcoreinfo addr: %lx\n", *addr);
+ DEBUG_MSG("sadump: vmcoreinfo len: %d\n", *len);
+
+ return TRUE;
+}
+
+/*
+ * Check if current kaslr_offset/phys_base is for 1st kernel or 2nd kernel.
+ * If we are in 2nd kernel, get kaslr_offset/phys_base from vmcoreinfo.
+ *
+ * 1. Get command line and try to retrieve "elfcorehdr=" boot parameter
+ * 2. If "elfcorehdr=" is not found in command line, we are in 1st kernel.
+ * There is nothing to do.
+ * 3. If "elfcorehdr=" is found, we are in 2nd kernel. Find vmcoreinfo
+ * using "elfcorehdr=" and retrieve kaslr_offset/phys_base from vmcoreinfo.
+ */
+int
+get_kaslr_offset_from_vmcoreinfo(ulong cr3, ulong *kaslr_offset,
+ ulong *phys_base)
+{
+ ulong elfcorehdr_addr = 0;
+ ulong vmcoreinfo_addr;
+ int vmcoreinfo_len;
+ char *buf, *pos;
+ int ret = FALSE;
+
+ elfcorehdr_addr = get_elfcorehdr(cr3);
+ if (!elfcorehdr_addr)
+ return FALSE;
+
+ if (!get_vmcoreinfo_in_kdump_kernel(elfcorehdr_addr, &vmcoreinfo_addr,
+ &vmcoreinfo_len))
+ return FALSE;
+
+ if (!vmcoreinfo_len)
+ return FALSE;
+
+ DEBUG_MSG("sadump: Find vmcoreinfo in kdump memory\n");
+
+ if (!(buf = malloc(vmcoreinfo_len))) {
+ ERRMSG("Can't allocate vmcoreinfo buffer.\n");
+ return FALSE;
+ }
+
+ if (!readmem(PADDR, vmcoreinfo_addr, buf, vmcoreinfo_len))
+ goto finish;
+
+ pos = strstr(buf, STR_NUMBER("phys_base"));
+ if (!pos)
+ goto finish;
+ *phys_base = strtoull(pos + strlen(STR_NUMBER("phys_base")), NULL, 0);
+
+ pos = strstr(buf, STR_KERNELOFFSET);
+ if (!pos)
+ goto finish;
+ *kaslr_offset = strtoull(pos + strlen(STR_KERNELOFFSET), NULL, 16);
+ ret = TRUE;
+
+finish:
+ free(buf);
+ return ret;
+}
+
+/*
* Calculate kaslr_offset and phys_base
*
* kaslr_offset:
@@ -1106,6 +1341,26 @@ get_vec0_addr(ulong idtr)
*
* Note that the address (A) cannot be used instead of (E) because (A) is
* not direct map address, it's a fixed map address.
+ *
+ * This solution works in most every case, but does not work in the
+ * following case.
+ *
+ * 1) If the dump is captured on early stage of kernel boot, IDTR points
+ * early IDT table(early_idts) instead of normal IDT(idt_table).
+ * 2) If the dump is captured whle kdump is working, IDTR points
+ * IDT table of 2nd kernel, not 1st kernel.
+ *
+ * Current implementation does not support the case 1), need
+ * enhancement in the future. For the case 2), get kaslr_offset and
+ * phys_base as follows.
+ *
+ * 1) Get kaslr_offset and phys_base using the above solution.
+ * 2) Get kernel boot parameter from "saved_command_line"
+ * 3) If "elfcorehdr=" is not included in boot parameter, we are in the
+ * first kernel, nothing to do any more.
+ * 4) If "elfcorehdr=" is included in boot parameter, we are in the 2nd
+ * kernel. Retrieve vmcoreinfo from address of "elfcorehdr=" and
+ * get kaslr_offset and phys_base from vmcoreinfo.
*/
int
calc_kaslr_offset(void)
@@ -1116,6 +1371,7 @@ calc_kaslr_offset(void)
int apicid;
unsigned long divide_error_vmcore, divide_error_vmlinux;
unsigned long kaslr_offset, phys_base;
+ unsigned long kaslr_offset_kdump, phys_base_kdump;
memset(&zero, 0, sizeof(zero));
for (apicid = 0; apicid < sh->nr_cpus; ++apicid) {
@@ -1161,6 +1417,21 @@ calc_kaslr_offset(void)
if (!get_symbol_info())
return FALSE;
+ /*
+ * Check if current kaslr_offset/phys_base is for 1st kernel or 2nd
+ * kernel. If we are in 2nd kernel, get kaslr_offset/phys_base
+ * from vmcoreinfo
+ */
+ if (get_kaslr_offset_from_vmcoreinfo(cr3, &kaslr_offset_kdump,
+ &phys_base_kdump)) {
+ info->kaslr_offset = kaslr_offset_kdump;
+ info->phys_base = phys_base_kdump;
+
+ /* Reload symbol */
+ if (!get_symbol_info())
+ return FALSE;
+ }
+
DEBUG_MSG("sadump: kaslr_offset=%lx\n", info->kaslr_offset);
DEBUG_MSG("sadump: phys_base=%lx\n", info->phys_base);

257
makedumpfile-fix-KASLR-for-sadump.patch Normal file
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@ -0,0 +1,257 @@
From: Takao Indoh <indou.takao@jp.fujitsu.com>
Date: Thu, 26 Oct 2017 20:32:54 +0900
Subject: Fix a KASLR problem of sadump
References: FATE#323473, bsc#1070291
Upstream: merged
Git-commit: e1ac694b94ebfa7204c5b1fac1a87d204b48f5b4
This patch fix a problem that makedumpfile cannot handle 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 makedumpfile cannot handle 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 makedumpfile. 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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
makedumpfile.c | 10 +++
makedumpfile.h | 5 +
sadump_info.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 155 insertions(+), 3 deletions(-)
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -1554,6 +1554,9 @@ get_symbol_info(void)
SYMBOL_INIT(demote_segment_4k, "demote_segment_4k");
SYMBOL_INIT(cur_cpu_spec, "cur_cpu_spec");
+ SYMBOL_INIT(divide_error, "divide_error");
+ SYMBOL_INIT(idt_table, "idt_table");
+
return TRUE;
}
@@ -2251,6 +2254,13 @@ write_vmcoreinfo_data(void)
WRITE_NUMBER_UNSIGNED("kimage_voffset", kimage_voffset);
#endif
+ if (info->phys_base)
+ fprintf(info->file_vmcoreinfo, "%s%lu\n", STR_NUMBER("phys_base"),
+ info->phys_base);
+ if (info->kaslr_offset)
+ fprintf(info->file_vmcoreinfo, "%s%lx\n", STR_KERNELOFFSET,
+ info->kaslr_offset);
+
/*
* write the source file of 1st kernel
*/
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -45,6 +45,7 @@
#include "sadump_mod.h"
#include <pthread.h>
#include <semaphore.h>
+#include <inttypes.h>
#define VMEMMAPSTART 0xffffea0000000000UL
#define BITS_PER_WORD 64
@@ -1593,6 +1594,8 @@ struct symbol_table {
unsigned long long cpu_online_mask;
unsigned long long __cpu_online_mask;
unsigned long long kexec_crash_image;
+ unsigned long long divide_error;
+ unsigned long long idt_table;
/*
* symbols on ppc64 arch
@@ -1953,7 +1956,7 @@ int iomem_for_each_line(char *match, int
unsigned long base,
unsigned long length),
void *data);
-
+int get_symbol_info(void);
/*
* for Xen extraction
--- a/sadump_info.c
+++ b/sadump_info.c
@@ -1035,6 +1035,138 @@ sadump_get_max_mapnr(void)
#ifdef __x86_64__
+/*
+ * Get address of vector0 interrupt handler (Devide Error) form Interrupt
+ * Descriptor Table.
+ */
+static unsigned long
+get_vec0_addr(ulong idtr)
+{
+ struct gate_struct64 {
+ uint16_t offset_low;
+ uint16_t segment;
+ uint32_t ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
+ uint16_t offset_middle;
+ uint32_t offset_high;
+ uint32_t zero1;
+ } __attribute__((packed)) gate;
+
+ readmem(PADDR, idtr, &gate, sizeof(gate));
+
+ return ((ulong)gate.offset_high << 32)
+ + ((ulong)gate.offset_middle << 16)
+ + gate.offset_low;
+}
+
+/*
+ * Calculate kaslr_offset and phys_base
+ *
+ * kaslr_offset:
+ * The difference between original address in vmlinux and actual address
+ * placed randomly by kaslr feature. To be more accurate,
+ * kaslr_offset = actual address - original address
+ *
+ * phys_base:
+ * Physical address where the kerenel is placed. In other words, it's a
+ * physical address of __START_KERNEL_map. This is also decided randomly by
+ * kaslr.
+ *
+ * kaslr offset and phys_base are calculated as follows:
+ *
+ * kaslr_offset:
+ * 1) Get IDTR and CR3 value from the dump header.
+ * 2) Get a virtual address of IDT from IDTR value
+ * --- (A)
+ * 3) Translate (A) to physical address using CR3, which points a top of
+ * page table.
+ * --- (B)
+ * 4) Get an address of vector0 (Devide Error) interrupt handler from
+ * IDT, which are pointed by (B).
+ * --- (C)
+ * 5) Get an address of symbol "divide_error" form vmlinux
+ * --- (D)
+ *
+ * Now we have two addresses:
+ * (C)-> Actual address of "divide_error"
+ * (D)-> Original address of "divide_error" in the vmlinux
+ *
+ * kaslr_offset can be calculated by the difference between these two
+ * value.
+ *
+ * phys_base;
+ * 1) Get IDT virtual address from vmlinux
+ * --- (E)
+ *
+ * So phys_base can be calculated using relationship of directly mapped
+ * address.
+ *
+ * phys_base =
+ * Physical address(B) -
+ * (Virtual address(E) + kaslr_offset - __START_KERNEL_map)
+ *
+ * Note that the address (A) cannot be used instead of (E) because (A) is
+ * not direct map address, it's a fixed map address.
+ */
+int
+calc_kaslr_offset(void)
+{
+ struct sadump_header *sh = si->sh_memory;
+ uint64_t idtr = 0, cr3 = 0, idtr_paddr;
+ struct sadump_smram_cpu_state smram, zero;
+ int apicid;
+ unsigned long divide_error_vmcore, divide_error_vmlinux;
+ unsigned long kaslr_offset, phys_base;
+
+ memset(&zero, 0, sizeof(zero));
+ for (apicid = 0; apicid < sh->nr_cpus; ++apicid) {
+ if (!get_smram_cpu_state(apicid, &smram)) {
+ ERRMSG("get_smram_cpu_state error\n");
+ return FALSE;
+ }
+
+ if (memcmp(&smram, &zero, sizeof(smram)) != 0)
+ break;
+ }
+ if (apicid >= sh->nr_cpus) {
+ ERRMSG("Can't get smram state\n");
+ return FALSE;
+ }
+
+ idtr = ((uint64_t)smram.IdtUpper)<<32 | (uint64_t)smram.IdtLower;
+ cr3 = smram.Cr3;
+
+ /* Convert virtual address of IDT table to physical address */
+ if ((idtr_paddr = vtop4_x86_64_pagetable(idtr, cr3)) == NOT_PADDR)
+ return FALSE;
+
+ /* Now we can calculate kaslr_offset and phys_base */
+ divide_error_vmlinux = SYMBOL(divide_error);
+ divide_error_vmcore = get_vec0_addr(idtr_paddr);
+ kaslr_offset = divide_error_vmcore - divide_error_vmlinux;
+ phys_base = idtr_paddr -
+ (SYMBOL(idt_table) + kaslr_offset - __START_KERNEL_map);
+
+ info->kaslr_offset = kaslr_offset;
+ info->phys_base = phys_base;
+
+ DEBUG_MSG("sadump: idtr=%" PRIx64 "\n", idtr);
+ DEBUG_MSG("sadump: cr3=%" PRIx64 "\n", cr3);
+ DEBUG_MSG("sadump: idtr(phys)=%" PRIx64 "\n", idtr_paddr);
+ DEBUG_MSG("sadump: devide_error(vmlinux)=%lx\n",
+ divide_error_vmlinux);
+ DEBUG_MSG("sadump: devide_error(vmcore)=%lx\n",
+ divide_error_vmcore);
+
+ /* Reload symbol */
+ if (!get_symbol_info())
+ return FALSE;
+
+ DEBUG_MSG("sadump: kaslr_offset=%lx\n", info->kaslr_offset);
+ DEBUG_MSG("sadump: phys_base=%lx\n", info->phys_base);
+
+ return TRUE;
+}
+
int
sadump_virt_phys_base(void)
{
@@ -1065,6 +1197,9 @@ sadump_virt_phys_base(void)
}
failed:
+ if (calc_kaslr_offset())
+ return TRUE;
+
info->phys_base = 0;
DEBUG_MSG("sadump: failed to calculate phys_base; default to 0\n");
@@ -1518,10 +1653,14 @@ cpu_to_apicid(int cpu, int *apicid)
if (!readmem(VADDR, SYMBOL(x86_bios_cpu_apicid_early_ptr),
&early_ptr, sizeof(early_ptr)))
return FALSE;
-
+ /*
+ * Note: SYMBOL(name) value is adjusted by info->kaslr_offset,
+ * but per_cpu symbol does not need to be adjusted becasue it
+ * is not affected by kaslr.
+ */
apicid_addr = early_ptr
? SYMBOL(x86_bios_cpu_apicid_early_map)+cpu*sizeof(uint16_t)
- : per_cpu_ptr(SYMBOL(x86_bios_cpu_apicid), cpu);
+ : per_cpu_ptr(SYMBOL(x86_bios_cpu_apicid) - info->kaslr_offset, cpu);
if (!readmem(VADDR, apicid_addr, &apicid_u16, sizeof(uint16_t)))
return FALSE;

5
makedumpfile-handle-renamed-init_level4_pgt-init_top_pgt.patch
View File

@ -1,7 +1,10 @@
From: Jeff Mahoney <jeffm@suse.com>
Subject: handle renamed init_level4_pgt -> init_top_pgt
Patch-mainline: Submitted to kexec-ml, 6 Nov 2017
References: bsc#1066770
Upstream: merged
Git-commit: 97e156b493c46fabfc4b136ab834a6495166ac66
* Required for kernel 4.13
Linux 4.13 renamed init_level4_pgt to init_top_pgt in preparation for
introducing 5-level page tables. This patch follows the rename if

2
makedumpfile-override-libtinfo.patch
View File

@ -1,6 +1,6 @@
From: Petr Tesarik <ptesarik@suse.com>
Subject: Allow to override the tinfo library used for eppic
Patch-mainline: never; only needed for compatibility with older ncurses
Upstream: never; only needed for compatibility with older ncurses
Allow to override the "-ltinfo" linker option with a make variable.

8
makedumpfile-ppc64-update-hash-page-table-geometry.patch
View File

@ -1,10 +1,10 @@
From 13f48cbab7207d8247834453b55d45b2a95f65cb Mon Sep 17 00:00:00 2001
From: Hari Bathini <hbathini@linux.vnet.ibm.com>
Date: Sat, 11 Nov 2017 02:13:54 +0900
Subject: [PATCH] [PATCH] ppc64: update hash page table geometry
Patch-mainline: yes
Subject: ppc64: update hash page table geometry
References: bsc#1067703
Upsream: merged
Git-commit: 13f48cbab7207d8247834453b55d45b2a95f65cb
* Required for kernel 4.12
Starting with kernel 4.12, BOOK3S hash page table geometry is updated

110
makedumpfile-vtop4_x86_64_pagetable.patch Normal file
View File

@ -0,0 +1,110 @@
From: Takao Indoh <indou.takao@jp.fujitsu.com>
Date: Thu, 26 Oct 2017 20:32:54 +0900
Subject: Introduce vtop4_x86_64_pagetable
References: FATE#323473, bsc#1070291
Upstream: merged
Git-commit: 8c89727155f4994b4e75a659e28e5eff16ff6cbc
This patch introduces new function vtop4_x86_64_pagetable
to translate virtual address to physical address. Unlike vtop4_x86_64,
vtop4_x86_64_pagetable need a pointer of top of pagetable like CR3.
Current vtop4_x86_64 implementation uses symbol value of
init_level4_pgt, therefore vtop4_x86_64 does not work for sadump
dumpfile of kaslr enabled kernel because it does not have vmcoreinfo to
correct address of init_level4_pgt. vtop4_x86_64_pagetable requires
pagetable address instead of init_level4_pgt and sadump dumpfile can
pass CR3 value which is included in dump header.
Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
arch/x86_64.c | 50 +++++++++++++++++++++++++++++++++-----------------
makedumpfile.h | 1 +
2 files changed, 34 insertions(+), 17 deletions(-)
--- a/arch/x86_64.c
+++ b/arch/x86_64.c
@@ -255,30 +255,15 @@ get_versiondep_info_x86_64(void)
* Translate a virtual address to a physical address by using 4 levels paging.
*/
unsigned long long
-vtop4_x86_64(unsigned long vaddr)
+__vtop4_x86_64(unsigned long vaddr, unsigned long pagetable)
{
unsigned long page_dir, pml4, pgd_paddr, pgd_pte, pmd_paddr, pmd_pte;
unsigned long pte_paddr, pte;
- unsigned long init_level4_pgt;
-
- if (SYMBOL(init_level4_pgt) != NOT_FOUND_SYMBOL)
- init_level4_pgt = SYMBOL(init_level4_pgt);
- else if (SYMBOL(init_top_pgt) != NOT_FOUND_SYMBOL)
- init_level4_pgt = SYMBOL(init_top_pgt);
- else {
- ERRMSG("Can't get the symbol of init_level4_pgt.\n");
- return NOT_PADDR;
- }
-
- if (SYMBOL(level4_kernel_pgt) != NOT_FOUND_SYMBOL) {
- ERRMSG("Kernel is built with 5-level page tables\n");
- return NOT_PADDR;
- }
/*
* Get PGD.
*/
- page_dir = init_level4_pgt - __START_KERNEL_map + info->phys_base;
+ page_dir = pagetable;
if (is_xen_memory()) {
page_dir = ptom_xen(page_dir);
if (page_dir == NOT_PADDR)
@@ -356,6 +341,37 @@ vtop4_x86_64(unsigned long vaddr)
return (pte & ENTRY_MASK) + PAGEOFFSET(vaddr);
}
+unsigned long long
+vtop4_x86_64(unsigned long vaddr)
+{
+ unsigned long pagetable;
+ unsigned long init_level4_pgt;
+
+ if (SYMBOL(init_level4_pgt) != NOT_FOUND_SYMBOL)
+ init_level4_pgt = SYMBOL(init_level4_pgt);
+ else if (SYMBOL(init_top_pgt) != NOT_FOUND_SYMBOL)
+ init_level4_pgt = SYMBOL(init_top_pgt);
+ else {
+ ERRMSG("Can't get the symbol of init_level4_pgt.\n");
+ return NOT_PADDR;
+ }
+
+ if (SYMBOL(level4_kernel_pgt) != NOT_FOUND_SYMBOL) {
+ ERRMSG("Kernel is built with 5-level page tables\n");
+ return NOT_PADDR;
+ }
+
+ pagetable = init_level4_pgt - __START_KERNEL_map + info->phys_base;
+
+ return __vtop4_x86_64(vaddr, pagetable);
+}
+
+unsigned long long
+vtop4_x86_64_pagetable(unsigned long vaddr, unsigned long pagetable)
+{
+ return __vtop4_x86_64(vaddr, pagetable);
+}
+
/*
* for Xen extraction
*/
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -977,6 +977,7 @@ int get_phys_base_x86_64(void);
int get_machdep_info_x86_64(void);
int get_versiondep_info_x86_64(void);
unsigned long long vtop4_x86_64(unsigned long vaddr);
+unsigned long long vtop4_x86_64_pagetable(unsigned long vaddr, unsigned long pagetable);
#define find_vmemmap() find_vmemmap_x86_64()
#define get_phys_base() get_phys_base_x86_64()
#define get_machdep_info() get_machdep_info_x86_64()

13
makedumpfile.changes
View File

@ -1,3 +1,16 @@
-------------------------------------------------------------------
Tue Jan 9 09:56:06 UTC 2018 - ptesarik@suse.com
- makedumpfile-__cpu_online_mask-symbol.patch: Support symbol
__cpu_online_mask (FATE#323473, bsc#1070291).
- makedumpfile-vtop4_x86_64_pagetable.patch: Introduce
vtop4_x86_64_pagetable (FATE#323473, bsc#1070291).
- makedumpfile-fix-KASLR-for-sadump.patch: Fix a KASLR problem of
sadump (FATE#323473, bsc#1070291).
- makedumpfile-fix-KASLR-for-sadump-while-kdump.patch: sadump: Fix
a KASLR problem of sadump while kdump is working (FATE#323473,
bsc#1070291).
-------------------------------------------------------------------
Wed Nov 15 18:05:58 UTC 2017 - msuchanek@suse.com

10
makedumpfile.spec
View File

@ -1,7 +1,7 @@
#
# spec file for package makedumpfile
#
# Copyright (c) 2017 SUSE LINUX Products GmbH, Nuernberg, Germany.
# Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
#
# All modifications and additions to the file contributed by third parties
# remain the property of their copyright owners, unless otherwise agreed
@ -43,6 +43,10 @@ Patch2: %{name}-override-libtinfo.patch
Patch3: %{name}-handle-renamed-init_level4_pgt-init_top_pgt.patch
Patch4: %{name}-ppc64-update-hash-page-table-geometry.patch
Patch5: %{name}-book3s-ppc64-Lower-the-max-real-address-to-53-bits.patch
Patch6: %{name}-__cpu_online_mask-symbol.patch
Patch7: %{name}-vtop4_x86_64_pagetable.patch
Patch8: %{name}-fix-KASLR-for-sadump.patch
Patch9: %{name}-fix-KASLR-for-sadump-while-kdump.patch
BuildRequires: libdw-devel
BuildRequires: libebl-devel
BuildRequires: libelf-devel
@ -76,6 +80,10 @@ via gdb or crash utility.
%patch3 -p1
%patch4 -p1
%patch5 -p1
%patch6 -p1
%patch7 -p1
%patch8 -p1
%patch9 -p1
%build
%if %{have_snappy}