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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-03-14 19:15:16 -0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-03-14 19:15:16 -0300 |
commit | 65eab2bc7dab326ee892ec5a4c749470b368b51a (patch) | |
tree | 341189a55a3d021db7f1c8a8e5b4772b6c782c25 /arch/arm64/mm/mmap.c | |
parent | f693dac4794fae99c04f75a3a1a5c4018bb33144 (diff) | |
parent | 09688c0166e76ce2fb85e86b9d99be8b0084cdf9 (diff) |
Merge remote-tracking branch 'torvalds/master' into perf/core
To pick up fixes that went thru perf/urgent.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'arch/arm64/mm/mmap.c')
-rw-r--r-- | arch/arm64/mm/mmap.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c index a38f54cd638c..77ada00280d9 100644 --- a/arch/arm64/mm/mmap.c +++ b/arch/arm64/mm/mmap.c @@ -7,8 +7,10 @@ #include <linux/io.h> #include <linux/memblock.h> +#include <linux/mm.h> #include <linux/types.h> +#include <asm/cpufeature.h> #include <asm/page.h> /* @@ -38,3 +40,18 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size) { return !(((pfn << PAGE_SHIFT) + size) & ~PHYS_MASK); } + +static int __init adjust_protection_map(void) +{ + /* + * With Enhanced PAN we can honour the execute-only permissions as + * there is no PAN override with such mappings. + */ + if (cpus_have_const_cap(ARM64_HAS_EPAN)) { + protection_map[VM_EXEC] = PAGE_EXECONLY; + protection_map[VM_EXEC | VM_SHARED] = PAGE_EXECONLY; + } + + return 0; +} +arch_initcall(adjust_protection_map); |