wireguard-linux/arch/arm64/include/asm/compiler.h, branch jd/unified-crypt-queueWireGuard for the Linux kernelhttps://git.zx2c4.com/wireguard-linux/atom/arch/arm64/include/asm/compiler.h?h=jd%2Funified-crypt-queue2020-03-18T09:50:20Zarm64: mask PAC bits of __builtin_return_address2020-03-18T09:50:20ZAmit Daniel Kachhapamit.kachhap@arm.com2020-03-13T09:04:58Zurn:sha1:689eae42afd7a916634146edca38463769969184
Functions like vmap() record how much memory has been allocated by their
callers, and callers are identified using __builtin_return_address(). Once
the kernel is using pointer-auth the return address will be signed. This
means it will not match any kernel symbol, and will vary between threads
even for the same caller.
The output of /proc/vmallocinfo in this case may look like,
0x(____ptrval____)-0x(____ptrval____) 20480 0x86e28000100e7c60 pages=4 vmalloc N0=4
0x(____ptrval____)-0x(____ptrval____) 20480 0x86e28000100e7c60 pages=4 vmalloc N0=4
0x(____ptrval____)-0x(____ptrval____) 20480 0xc5c78000100e7c60 pages=4 vmalloc N0=4
The above three 64bit values should be the same symbol name and not
different LR values.
Use the pre-processor to add logic to clear the PAC to
__builtin_return_address() callers. This patch adds a new file
asm/compiler.h and is transitively included via include/compiler_types.h on
the compiler command line so it is guaranteed to be loaded and the users of
this macro will not find a wrong version.
Helper macros ptrauth_kernel_pac_mask/ptrauth_clear_pac are created for
this purpose and added in this file. Existing macro ptrauth_user_pac_mask
moved from asm/pointer_auth.h.
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: remove unused asm/compiler.h header file2018-10-01T10:57:04ZArd Biesheuvelard.biesheuvel@linaro.org2018-09-27T13:07:37Zurn:sha1:9376b1e7b62523c84fde34908af01a85b8d0468a
arm64 does not define CONFIG_HAVE_ARCH_COMPILER_H, nor does it keep
anything useful in its copy of asm/compiler.h, so let's remove it
before anybody starts using it.
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: Miscellaneous header files2012-09-17T12:42:21ZCatalin Marinascatalin.marinas@arm.com2012-03-05T11:49:34Zurn:sha1:10b663aef1c24794d32141be86b4dfcc64293bd0
This patch introduces a few AArch64-specific header files together with
Kbuild entries for generic headers.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>