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linux/arch/powerpc/kernel
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Christophe Leroy ed815bd3fe powerpc/40x: Introduce _PAGE_READ and remove _PAGE_USER 
_PAGE_USER is used to select the zone. Today zone 0 is kernel
and zone 1 is user.

To implement _PAGE_NONE, _PAGE_USER is cleared, leading to no access
for user but kernel still has access to the page so it's possible for
a user application to write in that page by using a kernel function
as trampoline.

What is really wanted is to have user rights on pages below TASK_SIZE
and no user rights on pages above TASK_SIZE. Use zones for that.
There are 16 zones so lets use the 4 upper address bits to set the
zone and declare zone rights based on TASK_SIZE.

Then drop _PAGE_USER and reuse it as _PAGE_READ that will be checked
in Data TLB miss handler. That will properly handle PAGE_NONE for
both kernel and user.

In addition, it partially implements execute-only right. The
implementation won't be complete because once a TLB has been loaded
via the Instruction TLB miss handler, it will be possible to read
the page. But at least it can't be read unless it is executed first.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/2a13e3ba8a5dec43143cc1f9a91ec71ea1529f3c.1695659959.git.christophe.leroy@csgroup.eu
2023-10-19 17:12:47 +11:00
..
ptrace powerpc: Replace GPL 2.0+ README.legal boilerplate with SPDX 2023-09-19 20:05:58 +10:00
syscalls arch: Register fchmodat2, usually as syscall 452 2023-07-27 12:25:35 +02:00
trace powerpc updates for 6.6 2023-08-31 12:43:10 -07:00
vdso Kbuild updates for v6.5 2023-07-01 09:24:31 -07:00
.gitignore
85xx_entry_mapping.S powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
align.c
asm-offsets.c powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
audit.c powerpc: address missing-prototypes warnings 2023-08-02 22:22:19 +10:00
audit_32.h powerpc: address missing-prototypes warnings 2023-08-02 22:22:19 +10:00
btext.c powerpc: Use shared font data 2023-10-01 23:09:02 +11:00
cacheinfo.c powerpc: Remove asm/prom.h from all files that don't need it 2022-05-08 22:15:04 +10:00
cacheinfo.h
compat_audit.c powerpc: address missing-prototypes warnings 2023-08-02 22:22:19 +10:00
cpu_setup_6xx.S powerpc/32: Fix objtool unannotated intra-function call warnings 2022-11-18 19:00:06 +11:00
cpu_setup_44x.S
cpu_setup_e500.S powerpc/32: Fix objtool unannotated intra-function call warnings 2022-11-18 19:00:06 +11:00
cpu_setup_pa6t.S
cpu_setup_power.c powerpc/dexcr: Add initial Dynamic Execution Control Register (DEXCR) support 2023-06-19 17:36:25 +10:00
cpu_setup_ppc970.S
cpu_specs.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cpu_specs_8xx.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_40x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_44x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_47x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_85xx.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cpu_specs_book3s_32.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_book3s_64.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_e500mc.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cputable.c powerpc/kuap: Use MMU_FTR_KUAP on all and refactor disabling kuap 2023-08-02 22:22:18 +10:00
crash_dump.c powerpc/fadump: make is_kdump_kernel() return false when fadump is active 2023-09-18 12:23:27 +10:00
dawr.c powerpc: Include asm/firmware.h in all users of firmware_has_feature() 2022-06-29 16:45:05 +10:00
dbell.c powerpc/64: Fix perf profiling asynchronous interrupt handlers 2023-01-30 20:07:42 +11:00
dma-iommu.c powerpc/iommu: Incorrect DDW Table is referenced for SR-IOV device 2023-05-17 00:54:55 +10:00
dma-mask.c dma-mapping: move arch_dma_set_mask() declaration to header 2023-07-31 17:54:28 +02:00
dma-swiotlb.c swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction 2022-04-18 07:21:12 +02:00
dt_cpu_ftrs.c powerpc: move from strlcpy with unused retval to strscpy 2022-08-26 11:02:20 +10:00
early_32.c powerpc: Move C prototypes out of asm-prototypes.h 2022-03-08 22:06:25 +11:00
eeh.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
eeh_cache.c
eeh_driver.c powerpc/eeh: Set channel state after notifying the drivers 2023-02-15 22:41:11 +11:00
eeh_event.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
eeh_pe.c powerpc/eeh: Rely on dev->link_active_reporting 2023-06-14 17:58:12 -05:00
eeh_sysfs.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
entry_32.S powerpc/47x: Fix 47x syscall return crash 2023-10-11 09:31:26 +11:00
epapr_hcalls.S powerpc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-16 23:54:48 +10:00
epapr_paravirt.c
exceptions-64e.S powerpc/64e: Fix obtool warnings in exceptions-64e.S 2023-07-10 09:47:47 +10:00
exceptions-64s.S powerpc: add CFUNC assembly label annotation 2023-04-20 12:54:24 +10:00
fadump.c powerpc/fadump: reset dump area size if fadump memory reserve fails 2023-08-18 17:03:15 +10:00
firmware.c
fpu.S powerpc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-16 23:54:48 +10:00
head_8xx.S powerpc: remove unneeded #include <asm/export.h> 2023-08-16 23:54:48 +10:00
head_32.h powerpc: add a definition for the marker offset within the interrupt frame 2022-12-02 17:54:08 +11:00
head_40x.S powerpc/40x: Introduce _PAGE_READ and remove _PAGE_USER 2023-10-19 17:12:47 +11:00
head_44x.S powerpc/44x: Introduce _PAGE_READ and remove _PAGE_USER 2023-10-19 17:12:46 +11:00
head_64.S powerpc updates for 6.6 2023-08-31 12:43:10 -07:00
head_85xx.S powerpc/e500: Introduce _PAGE_READ and remove _PAGE_USER 2023-10-19 17:12:46 +11:00
head_book3s_32.S powerpc: remove unneeded #include <asm/export.h> 2023-08-16 23:54:48 +10:00
head_booke.h powerpc/32: Include thread_info.h in head_booke.h 2023-04-11 23:13:33 +10:00
hw_breakpoint.c powerpc/watchpoints: Annotate atomic context in more places 2023-09-18 12:23:47 +10:00
hw_breakpoint_constraints.c powerpc/watchpoint: Disable pagefaults when getting user instruction 2023-09-18 12:23:47 +10:00
idle.c powerpc: Simplify sysctl registration for powersave_nap_ctl_table 2023-03-16 15:18:12 +11:00
idle_6xx.S
idle_64e.S powerpc: add ISA v3.0 / v3.1 wait opcode macro 2022-09-28 19:22:10 +10:00
idle_85xx.S powerpc: Cleanup idle for e500 2022-09-26 23:00:14 +10:00
idle_book3s.S
ima_arch.c integrity: Always reference the blacklist keyring with appraisal 2023-08-01 08:17:25 -04:00
interrupt.c powerpc: Mark [h]ssr_valid accesses in check_return_regs_valid 2023-06-21 15:13:57 +10:00
interrupt_64.S powerpc: Fix merge conflict between pcrel and copy_thread changes 2023-04-26 16:20:16 +10:00
io-workarounds.c
io.c
iomap.c
iommu.c powerpc/iommu: Fix notifiers being shared by PCI and VIO buses 2023-08-25 23:44:35 +10:00
irq.c powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
irq_64.c powerpc/64: Don't call trace_hardirqs_on() in prep_irq_for_idle() 2023-04-20 13:21:49 +10:00
isa-bridge.c powerpc/isa-bridge: Fix ISA mapping when "ranges" is not present 2023-05-08 22:57:10 +10:00
jump_label.c
kdebugfs.c
kgdb.c powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
kprobes-ftrace.c
kprobes.c powerpc updates for 6.2 2022-12-19 07:13:33 -06:00
kvm.c powerpc: Remove CONFIG_PPC_BOOK3E_MMU 2022-09-26 23:00:14 +10:00
kvm_emul.S
l2cr_6xx.S
legacy_serial.c powerpc: Explicitly include correct DT includes 2023-08-02 22:22:19 +10:00
Makefile powerpc/64: Rename entry_64.S to prom_entry_64.S 2023-06-15 14:04:19 +10:00
mce.c powerpc/mce: log the error for all unrecoverable errors 2023-02-10 22:17:34 +11:00
mce_power.c
misc.S powerpc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-16 23:54:48 +10:00
misc_32.S powerpc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-16 23:54:48 +10:00
misc_64.S powerpc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-16 23:54:48 +10:00
module.c powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2} 2022-05-19 23:11:29 +10:00
module_32.c module: replace module_layout with module_memory 2023-03-09 12:55:15 -08:00
module_64.c powerpc/ftrace: Add support for -fpatchable-function-entry 2023-08-22 00:09:06 +10:00
msi.c
note.S
nvram_64.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
of_platform.c powerpc: Explicitly include correct DT includes 2023-08-02 22:22:19 +10:00
optprobes.c powerpc/kprobes: Have optimized_callback() use preempt_enable() 2022-11-24 23:31:49 +11:00
optprobes_head.S powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
paca.c powerpc/64: vmlinux support building with PCREL addresing 2023-04-20 12:59:21 +10:00
pci-common.c powerpc: Drop zalloc_maybe_bootmem() 2023-08-24 22:33:16 +10:00
pci-hotplug.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
pci_32.c powerpc/pci: Add option for using pci_to_OF_bus_map 2023-02-07 20:15:23 +11:00
pci_64.c powerpc/pci_64: Init pcibios subsys a bit later 2023-03-14 23:36:27 +11:00
pci_dn.c powerpc/pci_dn: Add missing of_node_put() 2022-09-05 17:30:25 +10:00
pci_of_scan.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
pmc.c powerpc/85xx: Mark some functions static and add missing includes to fix no previous prototype error 2023-08-23 15:55:21 +10:00
ppc_save_regs.S powerpc: update ppc_save_regs to save current r1 in pt_regs 2023-06-19 17:37:14 +10:00
proc_powerpc.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
process.c powerpc/dexcr: Support userspace ROP protection 2023-06-19 17:36:26 +10:00
prom.c powerpc/dexcr: Add initial Dynamic Execution Control Register (DEXCR) support 2023-06-19 17:36:25 +10:00
prom_entry_64.S powerpc/64: Rename entry_64.S to prom_entry_64.S 2023-06-15 14:04:19 +10:00
prom_init.c powerpc/prom_init: drop PROM_BUG() 2022-09-26 20:58:18 +10:00
prom_init_check.sh kasan, powerpc: don't rename memintrinsics if compiler adds prefixes 2023-03-23 17:18:33 -07:00
prom_parse.c
reloc_32.S
reloc_64.S powerpc/64: avoid using r13 in relocate 2022-09-28 19:22:13 +10:00
rtas-proc.c powerpc/rtas: arch-wide function token lookup conversions 2023-02-13 22:35:03 +11:00
rtas-rtc.c powerpc/rtas: arch-wide function token lookup conversions 2023-02-13 22:35:03 +11:00
rtas.c powerpc/rtas: export rtas_error_rc() for reuse. 2023-08-18 23:28:57 +10:00
rtas_entry.S powerpc/rtas: Fix RTAS MSR[HV] handling for Cell 2022-08-26 08:41:54 +10:00
rtas_flash.c powerpc/rtas_flash: allow user copy to flash block cache objects 2023-08-17 09:46:14 +10:00
rtas_pci.c powerpc/rtas: arch-wide function token lookup conversions 2023-02-13 22:35:03 +11:00
rtasd.c powerpc/rtas: arch-wide function token lookup conversions 2023-02-13 22:35:03 +11:00
secure_boot.c
security.c powerpc/security: Fix Speculation_Store_Bypass reporting on Power10 2023-07-10 09:47:47 +10:00
secvar-ops.c powerpc/secvar: Warn and error if multiple secvar ops are set 2023-02-12 22:12:36 +11:00
secvar-sysfs.c powerpc/secvar: Don't print error on ENOENT when reading variables 2023-02-12 22:12:37 +11:00
setup-common.c powerpc: Explicitly include correct DT includes 2023-08-02 22:22:19 +10:00
setup.h powerpc: Remove CONFIG_PPC_BOOK3E 2022-09-26 23:00:13 +10:00
setup_32.c powerpc: Change CONFIG_E500 to CONFIG_PPC_E500 2022-09-26 23:00:13 +10:00
setup_64.c cpu: Mark panic_smp_self_stop() __noreturn 2023-04-14 17:31:25 +02:00
signal.c powerpc: Replace GPL 2.0+ README.legal boilerplate with SPDX 2023-09-19 20:05:58 +10:00
signal.h powerpc: Replace GPL 2.0+ README.legal boilerplate with SPDX 2023-09-19 20:05:58 +10:00
signal_32.c powerpc/signal32: Force inlining of __unsafe_save_user_regs() and save_tm_user_regs_unsafe() 2023-06-09 23:29:51 +10:00
signal_64.c powerpc/signal: Update comment for clarity 2022-07-28 16:22:14 +10:00
smp-tbsync.c
smp.c Merge branch 'topic/cpu-smt' into next 2023-08-14 21:46:03 +10:00
stacktrace.c powerpc/stacktrace: Fix arch_stack_walk_reliable() 2023-09-22 20:29:27 +10:00
static_call.c
suspend.c
switch.S powerpc: merge 32-bit and 64-bit _switch implementation 2023-06-15 14:03:55 +10:00
swsusp.c
swsusp_32.S powerpc/32: Fix objtool unannotated intra-function call warnings 2022-11-18 19:00:06 +11:00
swsusp_64.c
swsusp_85xx.S powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
swsusp_asm64.S powerpc/64: asm use consistent global variable declaration and access 2022-09-28 19:22:12 +10:00
sys_ppc32.c powerpc/32: fix syscall wrappers with 64-bit arguments 2022-11-01 10:24:09 +11:00
syscall.c powerpc/kuap: MMU_FTR_BOOK3S_KUAP becomes MMU_FTR_KUAP 2023-08-02 22:22:18 +10:00
syscalls.c powerpc: Adopt SYSCALL_DEFINE for arch-specific syscall handlers 2022-09-28 19:22:08 +10:00
sysfs.c powerpc/sysfs: move to use bus_get_dev_root() 2023-03-17 15:29:34 +01:00
systbl.c powerpc: Don't add __powerpc_ prefix to syscall entry points 2022-10-07 00:59:54 +11:00
tau_6xx.c powerpc, workqueue: Use alloc_ordered_workqueue() to create ordered workqueues 2023-05-08 13:52:27 -10:00
time.c powerpc: Make generic_calibrate_decr() the default 2023-03-16 08:56:48 +11:00
tm.S powerpc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-16 23:54:48 +10:00
traps.c Merge branch fixes into next 2023-10-18 22:26:42 +11:00
ucall.S powerpc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-16 23:54:48 +10:00
udbg.c powerpc: Add support for early debugging via Serial 16550 console 2022-09-28 19:22:09 +10:00
udbg_16550.c powerpc: Add support for early debugging via Serial 16550 console 2022-09-28 19:22:09 +10:00
uprobes.c powerpc: Reject probes on instructions that can't be single stepped 2022-05-06 00:00:20 +10:00
vdso.c mm: remove zap_page_range and create zap_vma_pages 2023-01-18 17:12:55 -08:00
vdso32_wrapper.S
vdso64_wrapper.S
vecemu.c
vector.S powerpc: replace #include <asm/export.h> with #include <linux/export.h> 2023-08-16 23:54:48 +10:00
vmlinux.lds.S powerpc/ftrace: Extend ftrace support for large kernels to ppc32 2023-08-22 00:09:05 +10:00
watchdog.c nmi_backtrace: allow excluding an arbitrary CPU 2023-08-18 10:19:00 -07:00