diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2022-03-03 21:00:44 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-16 16:23:43 +0300 |
| commit | 61d32defc00f809dc5102a41b541ee38a66c7c59 (patch) | |
| tree | d33394b513c212d8880aa34f3dd85baab7c24d08 /virt | |
| parent | 72ea28d88d30cefc5b0184e4666cf4817f2a0fa8 (diff) | |
| download | linux-61d32defc00f809dc5102a41b541ee38a66c7c59.tar.xz | |
arm64: Ensure execute-only permissions are not allowed without EPAN
commit 6e2edd6371a497a6350bb735534c9bda2a31f43d upstream.
Commit 18107f8a2df6 ("arm64: Support execute-only permissions with
Enhanced PAN") re-introduced execute-only permissions when EPAN is
available. When EPAN is not available, arch_filter_pgprot() is supposed
to change a PAGE_EXECONLY permission into PAGE_READONLY_EXEC. However,
if BTI or MTE are present, such check does not detect the execute-only
pgprot in the presence of PTE_GP (BTI) or MT_NORMAL_TAGGED (MTE),
allowing the user to request PROT_EXEC with PROT_BTI or PROT_MTE.
Remove the arch_filter_pgprot() function, change the default VM_EXEC
permissions to PAGE_READONLY_EXEC and update the protection_map[] array
at core_initcall() if EPAN is detected.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Fixes: 18107f8a2df6 ("arm64: Support execute-only permissions with Enhanced PAN")
Cc: <stable@vger.kernel.org> # 5.13.x
Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions