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| author |   Vincenzo Frascino <vincenzo.frascino@arm.com> | 2019-04-15 10:49:34 +0100 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2019-04-23 18:01:31 +0100 |
| commit | 0d747f6585954d7285a3995058e7dfeae7236cf9 (patch) | |
| tree | 6e0ceb723e3d0d5cbc41d993c3419f58f50cde04 /arch/arm64/kernel/signal32.c | |
| parent | ACPI/IORT: Reject platform device creation on NUMA node mapping failure (diff) | |
| download | linux-dev-0d747f6585954d7285a3995058e7dfeae7236cf9.tar.xz linux-dev-0d747f6585954d7285a3995058e7dfeae7236cf9.zip | |
arm64: compat: Alloc separate pages for vectors and sigpage
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>
Diffstat (limited to 'arch/arm64/kernel/signal32.c')
| -rw-r--r-- | arch/arm64/kernel/signal32.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c index cb7800acd19f..caea6e25db2a 100644 --- a/arch/arm64/kernel/signal32.c +++ b/arch/arm64/kernel/signal32.c @@ -403,8 +403,7 @@ static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, if (ka->sa.sa_flags & SA_SIGINFO) idx += 3; - retcode = AARCH32_VECTORS_BASE + - AARCH32_KERN_SIGRET_CODE_OFFSET + + retcode = (unsigned long)current->mm->context.vdso + (idx << 2) + thumb; } |