Messages in this thread Patch in this message | | | From | Miles Chen <> | Subject | [PATCH] arm64: dump: hide kernel pointers | Date | Tue, 28 Feb 2017 15:05:36 +0800 |
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Mask kernel pointers of /sys/kernel/debug/kernel_page_tables entry like /proc/vmallocinfo does.
With sysctl kernel.kptr_restrict=0 or 1: cat /sys/kernel/debug/kernel_page_tables ---[ Modules start ]--- ---[ Modules end ]--- ---[ vmalloc() Area ]--- ffffff8008000000-ffffff8008010000 64K PTE RW NX SHD AF... ffffff8008015000-ffffff8008016000 4K PTE RW NX SHD AF... ffffff8008020000-ffffff8008030000 64K PTE RW NX SHD AF... ffffff8008031000-ffffff8008071000 256K PTE RW NX SHD AF... ffffff8008080000-ffffff8008200000 1536K PTE ro x SHD AF... ffffff8008200000-ffffff8008400000 2M PMD ro x SHD AF... ffffff8008400000-ffffff8008540000 1280K PTE ro x SHD AF... ffffff8008540000-ffffff8008690000 1344K PTE ro NX SHD AF... ffffff8008940000-ffffff8008a10000 832K PTE RW NX SHD AF... ffffff8008aca000-ffffff8008acd000 12K PTE RW NX SHD AF... ffffffbebffd8000-ffffffbebffdb000 12K PTE RW NX SHD AF... ---[ vmalloc() End ]--- ---[ Fixmap start ]--- ffffffbefe800000-ffffffbefea00000 2M PMD ro NX SHD AF... ---[ Fixmap end ]--- ---[ PCI I/O start ]--- ---[ PCI I/O end ]--- ---[ Linear Mapping ]--- ffffffc000000000-ffffffc000080000 512K PTE RW NX SHD AF... ffffffc000080000-ffffffc000200000 1536K PTE ro NX SHD AF... ffffffc000200000-ffffffc000600000 4M PMD ro NX SHD AF... ffffffc000600000-ffffffc000690000 576K PTE ro NX SHD AF... ffffffc000690000-ffffffc000800000 1472K PTE RW NX SHD AF... ffffffc000800000-ffffffc002000000 24M PMD RW NX SHD AF... ffffffc002000000-ffffffc040000000 992M PMD RW NX SHD AF... ffffffc040000000-ffffffc080000000 1G PGD RW NX SHD AF...
With sysctl kernel.kptr_restrict=2: cat /sys/kernel/debug/kernel_page_tables ---[ Modules start ]--- ---[ Modules end ]--- ---[ vmalloc() Area ]--- 0000000000000000-0000000000000000 64K PTE RW NX SHD AF... 0000000000000000-0000000000000000 4K PTE RW NX SHD AF... 0000000000000000-0000000000000000 64K PTE RW NX SHD AF... 0000000000000000-0000000000000000 256K PTE RW NX SHD AF... 0000000000000000-0000000000000000 1536K PTE ro x SHD AF... 0000000000000000-0000000000000000 2M PMD ro x SHD AF... 0000000000000000-0000000000000000 1280K PTE ro x SHD AF... 0000000000000000-0000000000000000 1344K PTE ro NX SHD AF... 0000000000000000-0000000000000000 832K PTE RW NX SHD AF... 0000000000000000-0000000000000000 12K PTE RW NX SHD AF... 0000000000000000-0000000000000000 12K PTE RW NX SHD AF... ---[ vmalloc() End ]--- ---[ Fixmap start ]--- 0000000000000000-0000000000000000 2M PMD ro NX SHD AF... ---[ Fixmap end ]--- ---[ PCI I/O start ]--- ---[ PCI I/O end ]--- ---[ Linear Mapping ]--- 0000000000000000-0000000000000000 512K PTE RW NX SHD AF... 0000000000000000-0000000000000000 1536K PTE ro NX SHD AF... 0000000000000000-0000000000000000 4M PMD ro NX SHD AF... 0000000000000000-0000000000000000 576K PTE ro NX SHD AF... 0000000000000000-0000000000000000 1472K PTE RW NX SHD AF... 0000000000000000-0000000000000000 24M PMD RW NX SHD AF... 0000000000000000-0000000000000000 992M PMD RW NX SHD AF... 0000000000000000-0000000000000000 1G PGD RW NX SHD AF...
Signed-off-by: Miles Chen <miles.chen@mediatek.com> --- arch/arm64/mm/dump.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c index ca74a2a..e055ecf 100644 --- a/arch/arm64/mm/dump.c +++ b/arch/arm64/mm/dump.c @@ -253,8 +253,8 @@ static void note_page(struct pg_state *st, unsigned long addr, unsigned level, if (st->current_prot) { note_prot_uxn(st, addr); note_prot_wx(st, addr); - pt_dump_seq_printf(st->seq, "0x%016lx-0x%016lx ", - st->start_address, addr); + pt_dump_seq_printf(st->seq, "%pK-%pK ", + (void *)st->start_address, (void *)addr); delta = (addr - st->start_address) >> 10; while (!(delta & 1023) && unit[1]) { -- 1.9.1
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