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43b1d3e68e
mirror_ubuntu-kernels/arch/x86/kernel
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Chris Koch 43b1d3e68e kexec: Allocate kernel above bzImage's pref_address 
A relocatable kernel will relocate itself to pref_address if it is
loaded below pref_address. This means a booted kernel may be relocating
itself to an area with reserved memory on modern systems, potentially
clobbering arbitrary data that may be important to the system.

This is often the case, as the default value of PHYSICAL_START is
0x1000000 and kernels are typically loaded at 0x100000 or above by
bootloaders like iPXE or kexec. GRUB behaves like the approach
implemented here.

Also fixes the documentation around pref_address and PHYSICAL_START to
be accurate.

[ dhansen: changelog tweak ]

Co-developed-by: Cloud Hsu <cloudhsu@google.com>
Signed-off-by: Cloud Hsu <cloudhsu@google.com>
Signed-off-by: Chris Koch <chrisko@google.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Link: https://lore.kernel.org/all/20231215190521.3796022-1-chrisko%40google.com
2024-02-22 15:13:57 -08:00
..
acpi x86/acpi: Handle bogus MADT APIC tables gracefully 2023-12-18 14:21:44 +01:00
apic x86/cleanups changes for v6.8: 2024-01-08 17:23:32 -08:00
cpu x86/CPU/AMD: Add more models to X86_FEATURE_ZEN5 2024-01-25 12:26:21 +01:00
fpu header cleanups for 6.8 2024-01-10 16:43:55 -08:00
kprobes x86/kprobes: fix incorrect return address calculation in kprobe_emulate_call_indirect 2024-01-04 14:10:59 +09:00
.gitignore
alternative.c x86/paravirt: Make BUG_func() usable by non-GPL modules 2024-01-22 15:51:07 +01:00
amd_gart_64.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
amd_nb.c X86 core code updates: 2023-10-30 17:37:47 -10:00
aperture_64.c x86/pci: Use PCI_HEADER_TYPE_* instead of literals 2023-12-01 15:00:43 -06:00
apm_32.c x86/asm: Replace magic numbers in GDT descriptors, script-generated change 2023-12-20 10:57:38 +01:00
asm-offsets_32.c
asm-offsets_64.c x86: Fixup asm-offsets duplicate 2022-10-17 16:41:06 +02:00
asm-offsets.c x86/tdx: Make TDX_HYPERCALL asm similar to TDX_MODULE_CALL 2023-09-12 16:28:13 -07:00
audit_64.c x86/audit: Fix -Wmissing-variable-declarations warning for ia32_xyz_class 2023-08-30 10:11:16 +02:00
bootflag.c
callthunks.c x86/paravirt: Switch mixed paravirt/alternative calls to alternatives 2023-12-10 23:33:09 +01:00
cet.c x86/ibt: Convert IBT selftest to asm 2023-08-17 17:07:09 +02:00
cfi.c cfi: Flip headers 2023-12-15 16:25:55 -08:00
check.c
cpuid.c x86/cpuid: make cpuid_class a static const structure 2023-08-05 08:31:41 +02:00
crash_core_32.c
crash_core_64.c
crash_dump_32.c
crash_dump_64.c use less confusing names for iov_iter direction initializers 2022-11-25 13:01:55 -05:00
crash.c x86/crash: use SZ_1M macro instead of hardcoded value 2024-01-05 10:45:25 -08:00
devicetree.c x86/of: Move the x86_flattree_get_config() call out of x86_dtb_init() 2023-10-02 21:30:09 +02:00
doublefault_32.c x86: Avoid missing-prototype warnings for doublefault code 2023-05-18 11:56:18 -07:00
dumpstack_32.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
dumpstack_64.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
dumpstack.c x86/show_trace_log_lvl: Ensure stack pointer is aligned, again 2023-05-16 06:31:04 -07:00
e820.c x86/setup: Move duplicate boot_cpu_data definition out of the ifdeffery 2023-01-11 12:45:16 +01:00
early_printk.c x86/earlyprintk: Clean up pciserial 2022-08-29 12:19:25 +02:00
early-quirks.c x86/pci: Use PCI_HEADER_TYPE_* instead of literals 2023-12-01 15:00:43 -06:00
ebda.c
eisa.c
espfix_64.c x86/espfix: Use get_random_long() rather than archrandom 2022-10-31 20:12:50 +01:00
ftrace_32.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
ftrace_64.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
ftrace.c x86/ftrace: Remove unsued extern declaration ftrace_regs_caller_ret() 2023-07-10 21:38:13 -04:00
head32.c x86/microcode/32: Move early loading after paging enable 2023-10-18 22:15:01 +02:00
head64.c x86/asm: Always set A (accessed) flag in GDT descriptors 2023-12-20 10:57:51 +01:00
head_32.S Major microcode loader restructuring, cleanup and improvements by Thomas 2023-11-04 08:46:37 -10:00
head_64.S x86/startup_64: Drop long return to initial_code pointer 2024-01-31 18:31:21 +01:00
hpet.c RTC for 6.8 2024-01-18 17:25:39 -08:00
hw_breakpoint.c x86/amd: Cache debug register values in percpu variables 2023-01-31 20:09:26 +01:00
i8237.c
i8253.c
i8259.c x86/i8259: Skip probing when ACPI/MADT advertises PCAT compatibility 2023-10-27 20:36:49 +02:00
ibt_selftest.S x86/ibt: Convert IBT selftest to asm 2023-08-17 17:07:09 +02:00
idt.c x86/entry: Convert INT 0x80 emulation to IDTENTRY 2023-12-07 09:51:29 -08:00
io_delay.c
ioport.c
irq_32.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
irq_64.c x86/percpu: Move irq_stack variables next to current_task 2022-10-17 16:41:05 +02:00
irq_work.c x86/apic: Wrap IPI calls into helper functions 2023-08-09 12:00:55 -07:00
irq.c x86/apic: Nuke ack_APIC_irq() 2023-08-09 11:58:34 -07:00
irqflags.S x86/headers: Replace #include <asm/export.h> with #include <linux/export.h> 2023-10-03 10:38:07 +02:00
irqinit.c x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL 2023-01-16 17:24:56 +01:00
itmt.c arch/x86: Remove now superfluous sentinel elem from ctl_table arrays 2023-10-10 15:22:02 -07:00
jailhouse.c x86/apic: Remove the pointless APIC version check 2023-08-09 11:58:19 -07:00
jump_label.c
kdebugfs.c
kexec-bzimage64.c kexec: Allocate kernel above bzImage's pref_address 2024-02-22 15:13:57 -08:00
kgdb.c x86/kgdb: Fix a kerneldoc warning when build with W=1 2023-09-24 11:00:13 +02:00
ksysfs.c
kvm.c x86/cleanups changes for v6.8: 2024-01-08 17:23:32 -08:00
kvmclock.c Generic: 2024-01-17 13:03:37 -08:00
ldt.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
machine_kexec_32.c
machine_kexec_64.c x86/kexec: fix incorrect end address passed to kernel_ident_mapping_init() 2023-12-29 12:22:29 -08:00
Makefile x86/boot/32: Disable stackprotector and tracing for mk_early_pgtbl_32() 2023-10-18 11:11:43 +02:00
mmconf-fam10h_64.c
module.c x86/paravirt: Switch mixed paravirt/alternative calls to alternatives 2023-12-10 23:33:09 +01:00
mpparse.c x86/apic: Sanitize APIC address setup 2023-08-09 11:58:20 -07:00
msr.c x86/MSR: make msr_class a static const structure 2023-08-05 08:31:42 +02:00
nmi_selftest.c x86/apic: Wrap IPI calls into helper functions 2023-08-09 12:00:55 -07:00
nmi.c Major microcode loader restructuring, cleanup and improvements by Thomas 2023-11-04 08:46:37 -10:00
paravirt-spinlocks.c
paravirt.c x86/paravirt: Remove no longer needed paravirt patching code 2023-12-10 23:34:37 +01:00
pci-dma.c x86: always initialize xen-swiotlb when xen-pcifront is enabling 2023-07-31 17:54:27 +02:00
pcspeaker.c
perf_regs.c
platform-quirks.c x86/quirks: Include linux/pnp.h for arch_pnpbios_disabled() 2023-05-18 11:56:18 -07:00
pmem.c
probe_roms.c
process_32.c x86/resctl: fix scheduler confusion with 'current' 2023-03-08 11:48:11 -08:00
process_64.c x86/shstk: Add ARCH_SHSTK_STATUS 2023-08-02 15:01:51 -07:00
process.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
process.h
ptrace.c x86: Add PTRACE interface for shadow stack 2023-08-02 15:01:51 -07:00
pvclock.c locking/atomic: treewide: use raw_atomic*_<op>() 2023-06-05 09:57:20 +02:00
quirks.c
reboot_fixups_32.c
reboot.c x86/reboot: Expose VMCS crash hooks if and only if KVM_{INTEL,AMD} is enabled 2023-08-03 15:37:14 -07:00
relocate_kernel_32.S
relocate_kernel_64.S x86,objtool: Split UNWIND_HINT_EMPTY in two 2023-03-23 23:18:58 +01:00
resource.c x86/PCI: Tidy E820 removal messages 2022-12-10 10:33:11 -06:00
rethook.c
rtc.c rtc: Extend timeout for waiting for UIP to clear to 1s 2023-12-17 22:33:55 +01:00
setup_percpu.c x86/asm: Add DB flag to 32-bit percpu GDT entry 2023-12-20 10:57:51 +01:00
setup.c - Add support managing TDX host hardware 2024-01-18 13:41:48 -08:00
sev_verify_cbit.S
sev-shared.c arch/x86: Fix typos 2024-01-03 11:46:22 +01:00
sev.c x86/sev: Fix kernel crash due to late update to read-only ghcb_version 2023-11-30 10:23:12 +01:00
shstk.c x86/shstk: Add warning for shadow stack double unmap 2023-09-19 09:18:34 -07:00
signal_32.c x86/shstk: Add user control-protection fault handler 2023-08-02 15:01:50 -07:00
signal_64.c x86/shstk: Delay signal entry SSP write until after user accesses 2023-11-08 08:55:37 -08:00
signal.c rseq: Split out rseq.h from sched.h 2023-12-27 11:49:56 -05:00
smp.c Revert "x86/smp: Put CPUs into INIT on shutdown if possible" 2023-10-15 12:02:02 -07:00
smpboot.c x86/smp: Export symbol cpu_clustergroup_mask() 2023-11-17 10:54:52 +01:00
stacktrace.c
static_call.c x86/static_call: Fix __static_call_fixup() 2023-08-17 13:24:09 +02:00
step.c
sys_ia32.c
sys_x86_64.c x86/mm: Introduce MAP_ABOVE4G 2023-07-11 14:12:19 -07:00
tboot.c mm: remove rb tree. 2022-09-26 19:46:16 -07:00
time.c
tls.c x86/gsseg: Move load_gs_index() to its own new header file 2023-01-12 13:06:36 +01:00
tls.h
topology.c x86/topology: convert to use arch_cpu_is_hotpluggable() 2023-12-06 12:41:49 +09:00
trace_clock.c
trace.c
tracepoint.c
traps.c IOMMU Updates for Linux v6.8 2024-01-18 15:16:57 -08:00
tsc_msr.c
tsc_sync.c x86/tsc: Defer marking TSC unstable to a worker 2023-10-27 20:36:57 +02:00
tsc.c x86/tsc: Extend watchdog check exemption to 4-Sockets platform 2023-07-14 15:17:09 -07:00
umip.c
unwind_frame.c x86: kmsan: don't instrument stack walking functions 2022-10-03 14:03:25 -07:00
unwind_guess.c
unwind_orc.c x86/unwind/orc: Remove redundant initialization of 'mid' pointer in __orc_find() 2023-09-21 08:41:23 +02:00
uprobes.c uprobes/x86: Allow to probe a NOP instruction with 0x66 prefix 2022-12-05 11:55:18 +01:00
verify_cpu.S
vm86_32.c
vmlinux.lds.S x86/paravirt: Remove no longer needed paravirt patching code 2023-12-10 23:34:37 +01:00
vsmp_64.c x86/apic: Use u32 for phys_pkg_id() 2023-10-10 14:38:19 +02:00
x86_init.c - Fix a race window where load_unaligned_zeropad() could cause 2023-06-26 16:32:47 -07:00