| commit | 8add7054070ab79cb271b336d9660bca0ffcaf85 | |
| author | Yueyi Li <liyueyi@live.com> | |
| Mon, 24 Dec 2018 07:40:07 +0000 (24 07:40 +0000) | ||
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | |
| Wed, 17 Apr 2019 06:37:44 +0000 (17 08:37 +0200) | ||
| tree | 51d1d4bb7cd069e8a507c75528f0659ed0922fa7 | treesnapshot (tar.gz zip) |
| parent | 83b4ccf2ae92a6efc55f978568c08cc3b6fc0b10 | commitdiff |
arm64: kaslr: Reserve size of ARM64_MEMSTART_ALIGN in linear region
[ Upstream commit c8a43c18a97845e7f94ed7d181c11f41964976a2 ]
When KASLR is enabled (CONFIG_RANDOMIZE_BASE=y), the top 4K of kernel
virtual address space may be mapped to physical addresses despite being
reserved for ERR_PTR values.
Fix the randomization of the linear region so that we avoid mapping the
last page of the virtual address space.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: liyueyi <liyueyi@live.com>
[will: rewrote commit message; merged in suggestion from Ard]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
[ Upstream commit c8a43c18a97845e7f94ed7d181c11f41964976a2 ]
When KASLR is enabled (CONFIG_RANDOMIZE_BASE=y), the top 4K of kernel
virtual address space may be mapped to physical addresses despite being
reserved for ERR_PTR values.
Fix the randomization of the linear region so that we avoid mapping the
last page of the virtual address space.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: liyueyi <liyueyi@live.com>
[will: rewrote commit message; merged in suggestion from Ard]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
| arch/arm64/mm/init.c | diffblobblamehistory |