arm64: compat: Alloc separate pages for vectors and sigpage

Browse source

For AArch32 tasks, we install a special "[vectors]" page that contains
the sigreturn trampolines and kuser helpers, which is mapped at a fixed
address specified by the kuser helpers ABI.

Having the sigreturn trampolines in the same page as the kuser helpers
makes it impossible to disable the kuser helpers independently.

Follow the Arm implementation, by moving the signal trampolines out of
the "[vectors]" page and into their own "[sigpage]".

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
[will: tweaked comments and fixed sparse warning]
Signed-off-by: Will Deacon <will.deacon@arm.com>

...

This commit is contained in:

Vincenzo Frascino 2019-04-15 10:49:34 +01:00 • committed by Will Deacon

parent 36a2ba0775

commit 0d747f6585

4 changed files with 93 additions and 34 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

arch/arm64/include/asm/elf.h

View file

2

arch/arm64/include/asm/signal32.h

View file

3

arch/arm64/kernel/signal32.c

View file

120

arch/arm64/kernel/vdso.c

View file