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Subject[PATCH] arm64, kaslr: export offset in VMCOREINFO ELF notes
Date
Include KASLR offset in VMCOREINFO ELF notes to assist in debugging.

makedumpfile user-space utility will need fixup to use this KASLR offset
to work with cases where we need to find a way to translate symbol
address from vmlinux to kernel run time address in case of KASLR boot on
arm64.

I already have those fixup ready, which will be sent upstream once this
patch makes through (see [0]).

I tested this on my qualcomm amberwing board both for KASLR and
non-KASLR boot cases:

Without this patch:
# cat > scrub.conf << EOF
[vmlinux]
erase jiffies
erase init_task.utime
for tsk in init_task.tasks.next within task_struct:tasks
erase tsk.utime
endfor
EOF

# makedumpfile --split -d 31 -x vmlinux --config scrub.conf vmcore dumpfile_{1,2,3}
readpage_elf: Attempt to read non-existent page at 0xffffa8a5bf180000.
readmem: type_addr: 1, addr:ffffa8a5bf180000, size:8
vaddr_to_paddr_arm64: Can't read pgd
readmem: Can't convert a virtual address(ffff0000092a542c) to physical
address.
readmem: type_addr: 0, addr:ffff0000092a542c, size:390
check_release: Can't get the address of system_utsname

After this patch check_release() is ok, and also we are able to erase
symbol from vmcore (I checked this with kernel 4.18.0-rc4+):

# makedumpfile --split -d 31 -x vmlinux --config scrub.conf vmcore dumpfile_{1,2,3}
The kernel version is not supported.
The makedumpfile operation may be incomplete.
Checking for memory holes : [100.0 %] \
Checking for memory holes : [100.0 %] |
Checking foExcluding unnecessary pages : [100.0 %]
\
Excluding unnecessary pages : [100.0 %] \

The dumpfiles are saved to dumpfile_1, dumpfile_2, and dumpfile_3.

makedumpfile Completed.

[0] https://github.com/bhupesh-sharma/makedumpfile/commit/555e5ae0fb2b21797c450ad55950e81c470224ef

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
---
arch/arm64/kernel/machine_kexec.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index f62effc6e064..028df356a5fd 100644
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/arch/arm64/kernel/machine_kexec.c
@@ -360,4 +360,5 @@ void arch_crash_save_vmcoreinfo(void)
kimage_voffset);
vmcoreinfo_append_str("NUMBER(PHYS_OFFSET)=0x%llx\n",
PHYS_OFFSET);
+ vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset());
}
--
2.7.4
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