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kernel_samsung_a53x/arch/x86/kernel
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Kees Cook b619193f93 x86: Increase brk randomness entropy for 64-bit systems 
[ Upstream commit 44c76825d6eefee9eb7ce06c38e1a6632ac7eb7d ]

In commit c1d171a00294 ("x86: randomize brk"), arch_randomize_brk() was
defined to use a 32MB range (13 bits of entropy), but was never increased
when moving to 64-bit. The default arch_randomize_brk() uses 32MB for
32-bit tasks, and 1GB (18 bits of entropy) for 64-bit tasks.

Update x86_64 to match the entropy used by arm64 and other 64-bit
architectures.

Reported-by: y0un9n132@gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Jiri Kosina <jkosina@suse.com>
Closes: https://lore.kernel.org/linux-hardening/CA+2EKTVLvc8hDZc+2Yhwmus=dzOUG5E4gV7ayCbu0MPJTZzWkw@mail.gmail.com/
Link: https://lore.kernel.org/r/20240217062545.1631668-1-keescook@chromium.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-11-23 23:20:46 +01:00
..
acpi x86/i8259: Skip probing when ACPI/MADT advertises PCAT compatibility 2024-11-18 10:58:32 +01:00
apic genirq/cpuhotplug, x86/vector: Prevent vector leak during CPU offline 2024-11-19 12:27:11 +01:00
cpu x86/mtrr: Check if fixed MTRRs exist before saving them 2024-11-23 23:20:30 +01:00
fpu Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kprobes x86/kprobes: fix incorrect return address calculation in kprobe_emulate_call_indirect 2024-11-18 12:12:08 +01:00
alternative.c x86/alternative: Make custom return thunk unconditional 2024-11-18 22:25:38 +01:00
amd_gart_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
amd_nb.c x86/amd_nb: Check for invalid SMN reads 2024-11-19 14:19:30 +01:00
apb_timer.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
aperture_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
apm_32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
asm-offsets.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
asm-offsets_32.c x86/stackprotector/32: Make the canary into a regular percpu variable 2024-11-19 09:22:37 +01:00
asm-offsets_64.c x86/xen: Drop USERGS_SYSRET64 paravirt call 2024-11-19 12:26:38 +01:00
audit_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bootflag.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
cc_platform.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
check.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
cpuid.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
crash.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
crash_core_32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
crash_core_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
crash_dump_32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
crash_dump_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
devicetree.c x86/of: Return consistent error type from x86_of_pci_irq_enable() 2024-11-23 23:19:56 +01:00
doublefault_32.c x86/stackprotector/32: Make the canary into a regular percpu variable 2024-11-19 09:22:37 +01:00
dumpstack.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dumpstack_32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dumpstack_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
e820.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
early-quirks.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
early_printk.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ebda.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
eisa.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
espfix_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ftrace.c x86/returnthunk: Allow different return thunks 2024-11-18 22:25:38 +01:00
ftrace_32.S Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ftrace_64.S Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
head32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
head64.c x86/head/64: Re-enable stack protection 2024-11-19 09:23:16 +01:00
head_32.S x86/stackprotector/32: Make the canary into a regular percpu variable 2024-11-19 09:22:37 +01:00
head_64.S x86/head/64: Re-enable stack protection 2024-11-19 09:23:16 +01:00
hpet.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
hw_breakpoint.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i8237.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i8253.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
i8259.c x86/i8259: Skip probing when ACPI/MADT advertises PCAT compatibility 2024-11-18 10:58:32 +01:00
idt.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ima_arch.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
io_delay.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ioport.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
irq.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
irq_32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
irq_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
irq_work.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
irqflags.S Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
irqinit.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
itmt.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
jailhouse.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
jump_label.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kdebugfs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kexec-bzimage64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kgdb.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ksysfs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kvm.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kvmclock.c x86/kvm: Do not try to disable kvmclock if it was not enabled 2024-11-18 12:12:48 +01:00
ldt.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
machine_kexec_32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
machine_kexec_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Makefile x86/head/64: Re-enable stack protection 2024-11-19 09:23:16 +01:00
mmconf-fam10h_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
module.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mpparse.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
msr.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nmi.c x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key 2024-11-19 09:22:40 +01:00
nmi_selftest.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
paravirt-spinlocks.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
paravirt.c x86/xen: Drop USERGS_SYSRET64 paravirt call 2024-11-19 12:26:38 +01:00
paravirt_patch.c x86/xen: Drop USERGS_SYSRET64 paravirt call 2024-11-19 12:26:38 +01:00
pci-dma.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pci-iommu_table.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pci-swiotlb.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pcspeaker.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
perf_regs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
platform-quirks.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pmem.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
probe_roms.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
process.c x86: Increase brk randomness entropy for 64-bit systems 2024-11-23 23:20:46 +01:00
process.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
process_32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
process_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ptrace.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pvclock.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
quirks.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
reboot.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
reboot_fixups_32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
relocate_kernel_32.S Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
relocate_kernel_64.S Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
resource.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rtc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
setup.c x86/mm: Fix RESERVE_BRK() for older binutils 2024-11-18 10:58:45 +01:00
setup_percpu.c x86/stackprotector/32: Make the canary into a regular percpu variable 2024-11-19 09:22:37 +01:00
sev-es-shared.c x86/sev: Check for user-space IOIO pointing to kernel space 2024-11-08 11:26:09 +01:00
sev-es.c x86/sev: Check IOBM for IOIO exceptions from user-space 2024-11-08 11:26:09 +01:00
sev_verify_cbit.S Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
signal.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
signal_compat.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
smp.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
smpboot.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
stacktrace.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
static_call.c x86/returnthunk: Allow different return thunks 2024-11-18 22:25:38 +01:00
step.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sys_ia32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sys_x86_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sysfb.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sysfb_efi.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sysfb_simplefb.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tboot.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
time.c x86: stop playing stack games in profile_pc() 2024-11-19 14:19:33 +01:00
tls.c x86/stackprotector/32: Make the canary into a regular percpu variable 2024-11-19 09:22:37 +01:00
tls.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
topology.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_clock.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tracepoint.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
traps.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tsc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tsc_msr.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tsc_sync.c x86/tsc: Trust initial offset in architectural TSC-adjust MSRs 2024-11-19 12:26:51 +01:00
umip.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
unwind_frame.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
unwind_guess.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
unwind_orc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
uprobes.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
verify_cpu.S Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
vm86_32.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
vmlinux.lds.S x86: Fix .brk attribute in linker script 2024-11-18 10:58:46 +01:00
vsmp_64.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
x86_init.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00