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arm64: compat: Alloc separate pages for vectors and sigpage

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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 95 additions and 36 deletions
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2
arch/arm64/include/asm/signal32.h
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@@ -20,8 +20,6 @@
#ifdef CONFIG_COMPAT
#include <linux/compat.h>
#define AARCH32_KERN_SIGRET_CODE_OFFSET 0x500
int compat_setup_frame(int usig, struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs);
int compat_setup_rt_frame(int usig, struct ksignal *ksig, sigset_t *set,