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linux/arch/parisc/include/asm
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Zev Weiss d5aad4c2ca prctl: generalize PR_SET_MDWE support check to be per-arch 
Patch series "ARM: prctl: Reject PR_SET_MDWE where not supported".

I noticed after a recent kernel update that my ARM926 system started
segfaulting on any execve() after calling prctl(PR_SET_MDWE).  After some
investigation it appears that ARMv5 is incapable of providing the
appropriate protections for MDWE, since any readable memory is also
implicitly executable.

The prctl_set_mdwe() function already had some special-case logic added
disabling it on PARISC (commit 793838138c, "prctl: Disable
prctl(PR_SET_MDWE) on parisc"); this patch series (1) generalizes that
check to use an arch_*() function, and (2) adds a corresponding override
for ARM to disable MDWE on pre-ARMv6 CPUs.

With the series applied, prctl(PR_SET_MDWE) is rejected on ARMv5 and
subsequent execve() calls (as well as mmap(PROT_READ|PROT_WRITE)) can
succeed instead of unconditionally failing; on ARMv6 the prctl works as it
did previously.

[0] https://lore.kernel.org/all/2023112456-linked-nape-bf19@gregkh/


This patch (of 2):

There exist systems other than PARISC where MDWE may not be feasible to
support; rather than cluttering up the generic code with additional
arch-specific logic let's add a generic function for checking MDWE support
and allow each arch to override it as needed.

Link: https://lkml.kernel.org/r/20240227013546.15769-4-zev@bewilderbeest.net
Link: https://lkml.kernel.org/r/20240227013546.15769-5-zev@bewilderbeest.net
Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Acked-by: Helge Deller <deller@gmx.de>	[parisc]
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: Florent Revest <revest@chromium.org>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ondrej Mosnacek <omosnace@redhat.com>
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Russell King (Oracle) <linux@armlinux.org.uk>
Cc: Sam James <sam@gentoo.org>
Cc: Stefan Roesch <shr@devkernel.io>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Cc: <stable@vger.kernel.org>	[6.3+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-03-26 11:07:22 -07:00
..
alternative.h
parisc: Mark altinstructions read-only and 32-bit aligned
2023-11-25 09:43:17 +01:00
asm-offsets.h
…
asmregs.h
…
assembly.h
parisc: Avoid clobbering the C/B bits in the PSW with tophys and tovirt macros
2024-02-27 22:51:44 +01:00
atomic.h
locking/atomic: parisc: add preprocessor symbols
2023-06-05 09:57:16 +02:00
barrier.h
…
bitops.h
Revert "parisc: Show error if wrong 32/64-bit compiler is being used"
2022-08-22 11:09:17 +02:00
bug.h
parisc: Fix asm operand number out of range build error in bug table
2023-11-27 11:01:38 +01:00
cache.h
parisc: BTLB: Initialize BTLB tables at CPU startup
2023-09-07 09:12:20 +02:00
cacheflush.h
mm: Introduce flush_cache_vmap_early()
2023-12-14 00:23:17 -08:00
cachetype.h
Introduce cpu_dcache_is_aliasing() across all architectures
2024-02-22 15:27:19 -08:00
checksum.h
parisc: Strip upper 32 bit of sum in csum_ipv6_magic for 64-bit builds
2024-02-27 22:51:45 +01:00
cmpxchg.h
locking/arch: Rename all internal __xchg() names to __arch_xchg()
2023-04-29 09:08:44 +02:00
compat_ucontext.h
…
compat.h
…
current.h
…
delay.h
…
dma-mapping.h
dma-mapping: no need to pass a bus_type into get_arch_dma_ops()
2023-02-15 12:35:20 +01:00
dma.h
parisc: dma: Add prototype for pcxl_dma_start
2023-08-10 19:12:16 +02:00
dwarf.h
…
eisa_bus.h
…
eisa_eeprom.h
…
elf.h
parisc: fix mmap_base calculation when stack grows upwards
2023-11-15 15:30:09 -08:00
extable.h
parisc: Fix random data corruption from exception handler
2024-01-30 17:18:58 +01:00
fb.h
arch/parisc: Implement <asm/fb.h> with generic helpers
2023-04-20 10:05:01 +02:00
fixmap.h
parisc: Don't hardcode assembler bit definitions in tmpalias code
2022-05-23 13:44:24 +02:00
floppy.h
arch/*/: remove CONFIG_VIRT_TO_BUS
2022-06-28 13:20:21 +02:00
ftrace.h
parisc: ftrace: Add declaration for ftrace_function_trampoline()
2023-08-10 22:51:54 +02:00
futex.h
…
grfioctl.h
parisc: Drop HP-UX constants and structs from grfioctl.h
2023-05-03 17:43:26 +02:00
hardirq.h
…
hardware.h
parisc: Avoid printing the hardware path twice
2022-10-31 15:37:14 +01:00
hash.h
…
hugetlb.h
mm: hugetlb: add huge page size param to set_huge_pte_at()
2023-09-29 17:20:47 -07:00
io.h
asm/io: remove unnecessary xlate_dev_mem_ptr() and unxlate_dev_mem_ptr()
2023-11-23 10:37:40 +01:00
irq.h
…
irqflags.h
parisc: Check if IRQs are disabled when calling arch_local_irq_restore()
2023-06-30 17:14:13 +02:00
jump_label.h
work around gcc bugs with 'asm goto' with outputs
2024-02-09 15:57:48 -08:00
kbdleds.h
…
Kbuild
char/agp: introduce asm-generic/agp.h
2023-02-13 22:13:29 +01:00
kexec.h
…
kfence.h
…
kgdb.h
parisc: Limit amount of kgdb breakpoints on parisc
2023-05-03 17:41:21 +02:00
kprobes.h
parisc/kprobes: always include asm-generic/kprobes.h
2024-02-16 20:18:03 +01:00
ldcw.h
parisc: Mark lock_aligned variables 16-byte aligned on SMP
2023-11-25 09:43:17 +01:00
led.h
parisc: led: Rewrite LED/LCD driver to utilizize Linux LED subsystem
2023-08-28 17:58:14 +02:00
linkage.h
…
mman.h
prctl: generalize PR_SET_MDWE support check to be per-arch
2024-03-26 11:07:22 -07:00
mmu_context.h
…
mmu.h
…
mmzone.h
…
module.h
…
page.h
arch: simplify architecture specific page size configuration
2024-03-06 19:29:03 +01:00
parisc-device.h
parisc: make parisc_bus_type const
2024-02-27 22:51:44 +01:00
parport.h
…
patch.h
…
pci.h
PCI: Remove pci_get_legacy_ide_irq() and asm-generic/pci.h
2022-07-22 17:23:45 -05:00
pdc_chassis.h
…
pdc.h
parisc: firmware: Simplify calling non-PA20 functions
2023-09-07 09:12:20 +02:00
pdcpat.h
…
perf_event.h
…
perf.h
…
pgalloc.h
parisc: rename PGD_ORDER to PGD_TABLE_ORDER
2022-07-17 17:14:43 -07:00
pgtable.h
Merge tag 'x86_shstk_for_6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2023-08-31 12:20:12 -07:00
prefetch.h
…
processor.h
parisc: fix mmap_base calculation when stack grows upwards
2023-11-15 15:30:09 -08:00
psw.h
…
ptrace.h
…
ropes.h
parisc: sba-iommu: Fix sparse warnigs
2023-08-31 21:42:42 +02:00
rt_sigframe.h
…
runway.h
parisc: ccio-dma: Create private runway procfs root entry
2023-08-28 18:00:27 +02:00
seccomp.h
…
sections.h
…
serial.h
…
shmparam.h
parisc: shmparam.h: Document aliasing requirements of PA-RISC
2023-09-07 08:00:32 +02:00
signal.h
…
smp.h
…
socket.h
…
sparsemem.h
…
special_insns.h
parisc: Fix random data corruption from exception handler
2024-01-30 17:18:58 +01:00
spinlock_types.h
parisc: Restore __ldcw_align for PA-RISC 2.0 processors
2023-10-07 20:30:16 +02:00
spinlock.h
parisc: Fix lightweight spinlock checks to not break futexes
2023-08-10 17:32:09 +02:00
string.h
…
superio.h
…
switch_to.h
…
syscall.h
…
thread_info.h
…
timex.h
…
tlb.h
…
tlbflush.h
…
topology.h
…
traps.h
…
uaccess.h
parisc: Fix random data corruption from exception handler
2024-01-30 17:18:58 +01:00
ucontext.h
…
unaligned.h
…
unistd.h
Merge tag 'riscv-for-linus-5.19-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
2022-05-31 14:10:54 -07:00
unwind.h
…
vdso.h
…
vmalloc.h
…