| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970 |
- From fd143ce57a7cfaf015f1c0274b9f071f4046696a Mon Sep 17 00:00:00 2001
- From: Andy Lutomirski <[email protected]>
- Date: Tue, 12 Dec 2017 07:56:43 -0800
- Subject: [PATCH 171/232] x86/mm/64: Improve the memory map documentation
- MIME-Version: 1.0
- Content-Type: text/plain; charset=UTF-8
- Content-Transfer-Encoding: 8bit
- CVE-2017-5754
- The old docs had the vsyscall range wrong and were missing the fixmap.
- Fix both.
- There used to be 8 MB reserved for future vsyscalls, but that's long gone.
- Signed-off-by: Andy Lutomirski <[email protected]>
- Signed-off-by: Thomas Gleixner <[email protected]>
- Cc: Borislav Petkov <[email protected]>
- Cc: Brian Gerst <[email protected]>
- Cc: Dave Hansen <[email protected]>
- Cc: Dave Hansen <[email protected]>
- Cc: David Laight <[email protected]>
- Cc: H. Peter Anvin <[email protected]>
- Cc: Josh Poimboeuf <[email protected]>
- Cc: Juergen Gross <[email protected]>
- Cc: Kees Cook <[email protected]>
- Cc: Kirill A. Shutemov <[email protected]>
- Cc: Linus Torvalds <[email protected]>
- Cc: Peter Zijlstra <[email protected]>
- Signed-off-by: Ingo Molnar <[email protected]>
- (cherry picked from commit 5a7ccf4754fb3660569a6de52ba7f7fc3dfaf280)
- Signed-off-by: Andy Whitcroft <[email protected]>
- Signed-off-by: Kleber Sacilotto de Souza <[email protected]>
- (cherry picked from commit d694898656126d8a04e86f681c8fe34ea57f1b85)
- Signed-off-by: Fabian Grünbichler <[email protected]>
- ---
- Documentation/x86/x86_64/mm.txt | 10 ++++++----
- 1 file changed, 6 insertions(+), 4 deletions(-)
- diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt
- index 3448e675b462..83ca5a3b90ac 100644
- --- a/Documentation/x86/x86_64/mm.txt
- +++ b/Documentation/x86/x86_64/mm.txt
- @@ -19,8 +19,9 @@ ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks
- ffffffef00000000 - fffffffeffffffff (=64 GB) EFI region mapping space
- ... unused hole ...
- ffffffff80000000 - ffffffff9fffffff (=512 MB) kernel text mapping, from phys 0
- -ffffffffa0000000 - ffffffffff5fffff (=1526 MB) module mapping space (variable)
- -ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls
- +ffffffffa0000000 - [fixmap start] (~1526 MB) module mapping space (variable)
- +[fixmap start] - ffffffffff5fffff kernel-internal fixmap range
- +ffffffffff600000 - ffffffffff600fff (=4 kB) legacy vsyscall ABI
- ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
-
- Virtual memory map with 5 level page tables:
- @@ -41,8 +42,9 @@ ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks
- ffffffef00000000 - fffffffeffffffff (=64 GB) EFI region mapping space
- ... unused hole ...
- ffffffff80000000 - ffffffff9fffffff (=512 MB) kernel text mapping, from phys 0
- -ffffffffa0000000 - ffffffffff5fffff (=1526 MB) module mapping space
- -ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls
- +ffffffffa0000000 - [fixmap start] (~1526 MB) module mapping space
- +[fixmap start] - ffffffffff5fffff kernel-internal fixmap range
- +ffffffffff600000 - ffffffffff600fff (=4 kB) legacy vsyscall ABI
- ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
-
- Architecture defines a 64-bit virtual address. Implementations can support
- --
- 2.14.2
|
