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Unverified Commit 836ad075 authored by Kevin Brodsky's avatar Kevin Brodsky Committed by derfelot
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FROMLIST: [PATCH 1/6] arm64: compat: Use vDSO sigreturn trampolines if available 

(cherry pick from url https://patchwork.kernel.org/patch/10060449/

)

If the compat vDSO is enabled, it replaces the sigreturn page.
Therefore, we use the sigreturn trampolines the vDSO provides instead.

Signed-off-by: default avatarKevin Brodsky <kevin.brodsky@arm.com>
Signed-off-by: default avatarMark Salyzyn <salyzyn@android.com>
Bug: 63737556
Bug: 20045882
Change-Id: Ic0933741e321e1bf66409b7e190a776f12948024
parent 1b5b4cd6

arch/arm64/include/asm/vdso.h

+3 −0
Original line number Diff line number Diff line
@@ -28,6 +28,9 @@ 
#ifndef __ASSEMBLY__



#include <generated/vdso-offsets.h>

#ifdef CONFIG_VDSO32

#include <generated/vdso32-offsets.h>

#endif



#define VDSO_SYMBOL(base, name)						   \

({									   \

arch/arm64/kernel/signal32.c

+15 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <asm/signal32.h>

#include <asm/uaccess.h>

#include <asm/unistd.h>

#include <asm/vdso.h>



struct compat_vfp_sigframe {

	compat_ulong_t	magic;
@@ -438,6 +439,19 @@ static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, 
		retcode = ptr_to_compat(ka->sa.sa_restorer);

	} else {

		/* Set up sigreturn pointer */

#ifdef CONFIG_VDSO32

		void *vdso_base = current->mm->context.vdso;

		void *trampoline =

			(ka->sa.sa_flags & SA_SIGINFO

			 ? (thumb

			    ? VDSO_SYMBOL(vdso_base, compat_rt_sigreturn_thumb)

			    : VDSO_SYMBOL(vdso_base, compat_rt_sigreturn_arm))

			 : (thumb

			    ? VDSO_SYMBOL(vdso_base, compat_sigreturn_thumb)

			    : VDSO_SYMBOL(vdso_base, compat_sigreturn_arm)));



		retcode = ptr_to_compat(trampoline) + thumb;

#else

		void *sigreturn_base = current->mm->context.vdso;

		unsigned int idx = thumb << 1;
@@ -445,6 +459,7 @@ static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, 
			idx += 3;



		retcode = ptr_to_compat(sigreturn_base) + (idx << 2) + thumb;

#endif

	}



	regs->regs[0]	= usig;