AuxXxilium/linux_dsm_epyc7002
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975a2396e3
linux_dsm_epyc7002/arch
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Catalin Marinas 975a2396e3 arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page 
commit 68d54ceeec0e5fee4fb8048e6a04c193f32525ca upstream.

The ptrace(PTRACE_PEEKMTETAGS) implementation checks whether the user
page has valid tags (mapped with PROT_MTE) by testing the PG_mte_tagged
page flag. If this bit is cleared, ptrace(PTRACE_PEEKMTETAGS) returns
-EIO.

A newly created (PROT_MTE) mapping points to the zero page which had its
tags zeroed during cpu_enable_mte(). If there were no prior writes to
this mapping, ptrace(PTRACE_PEEKMTETAGS) fails with -EIO since the zero
page does not have the PG_mte_tagged flag set.

Set PG_mte_tagged on the zero page when its tags are cleared during
boot. In addition, to avoid ptrace(PTRACE_PEEKMTETAGS) succeeding on
!PROT_MTE mappings pointing to the zero page, change the
__access_remote_tags() check to (vm_flags & VM_MTE) instead of
PG_mte_tagged.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Fixes: 34bfeea4a9 ("arm64: mte: Clear the tags when a page is mapped in user-space with PROT_MTE")
Cc: <stable@vger.kernel.org> # 5.10.x
Cc: Will Deacon <will@kernel.org>
Reported-by: Luis Machado <luis.machado@linaro.org>
Tested-by: Luis Machado <luis.machado@linaro.org>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lore.kernel.org/r/20210210180316.23654-1-catalin.marinas@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-02-17 11:02:28 +01:00
..
alpha local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
arc arch/arc: add copy_user_page() to <asm/page.h> to fix build error on ARC 2021-01-19 18:27:26 +01:00
arm ARM: kexec: fix oops after TLB are invalidated 2021-02-17 11:02:24 +01:00
arm64 arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page 2021-02-17 11:02:28 +01:00
c6x arch-cleanup-2020-10-22 2020-10-23 10:06:38 -07:00
csky local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
h8300 h8300: fix PREEMPTION build, TI_PRE_COUNT undefined 2021-02-17 11:02:28 +01:00
hexagon local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
ia64 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
m68k local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
microblaze local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
mips MIPS: relocatable: fix possible boot hangup with KASLR enabled 2021-01-19 18:27:20 +01:00
nds32 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
nios2 sched/idle: Fix arch_cpu_idle() vs tracing 2020-11-24 16:47:35 +01:00
openrisc sched/idle: Fix arch_cpu_idle() vs tracing 2020-11-24 16:47:35 +01:00
parisc parisc: Enable -mlong-calls gcc option by default when !CONFIG_MODULES 2021-02-03 23:28:37 +01:00
powerpc powerpc/64/signal: Fix regression in __kernel_sigtramp_rt64() semantics 2021-02-13 13:55:02 +01:00
riscv riscv: virt_addr_valid must check the address belongs to linear mapping 2021-02-17 11:02:23 +01:00
s390 s390: uv: Fix sysfs max number of VCPUs reporting 2021-02-03 23:28:39 +01:00
sh sh: Remove unused HAVE_COPY_THREAD_TLS macro 2021-01-27 11:55:20 +01:00
sparc local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
um um: virtio: free vu_dev only with the contained struct device 2021-02-10 09:29:12 +01:00
x86 x86/pci: Create PCI/MSI irqdomain after x86_init.pci.arch_init() 2021-02-17 11:02:28 +01:00
xtensa local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
.gitignore
Kconfig fanotify: Fix sys_fanotify_mark() on native x86-32 2021-01-17 14:16:59 +01:00