kernel.git/arch/arm64/include/asm/ptdump.h, branch linux-4.13.y

arm64: dump: Add checking for writable and exectuable pages

2016-11-07T18:15:04Z

Page mappings with full RWX permissions are a security risk. x86 has an option to walk the page tables and dump any bad pages. (See e1a58320a38d ("x86/mm: Warn on W^X mappings")). Add a similar implementation for arm64. Reviewed-by: Kees Cook Reviewed-by: Mark Rutland Tested-by: Mark Rutland Signed-off-by: Laura Abbott Reviewed-by: Ard Biesheuvel [catalin.marinas@arm.com: folded fix for KASan out of bounds from Mark Rutland] Signed-off-by: Catalin Marinas

arm64: dump: Remove max_addr

2016-11-07T18:15:04Z

max_addr was added as part of struct ptdump_info but has never actually been used. Remove it. Reviewed-by: Kees Cook Reviewed-by: Mark Rutland Tested-by: Mark Rutland Signed-off-by: Laura Abbott Signed-off-by: Catalin Marinas

arm64: dump: Make ptdump debugfs a separate option

2016-11-07T18:15:04Z

ptdump_register currently initializes a set of page table information and registers debugfs. There are uses for the ptdump option without wanting the debugfs options. Split this out to make it a separate option. Reviewed-by: Ard Biesheuvel Reviewed-by: Kees Cook Reviewed-by: Mark Rutland Tested-by: Mark Rutland Signed-off-by: Laura Abbott Signed-off-by: Catalin Marinas

arm64: mm: dump: make page table dumping reusable

2016-06-21T14:09:11Z

For debugging purposes, it would be nice if we could export page tables other than the swapper_pg_dir to userspace. To enable this, this patch refactors the arm64 page table dumping code such that multiple tables may be registered with the framework, and exported under debugfs. Signed-off-by: Mark Rutland Signed-off-by: Ard Biesheuvel Cc: Laura Abbott Cc: Will Deacon Signed-off-by: Catalin Marinas