linux-kernel - [PATCH 13/19] x86/signal: Check if vdso_image_32 is mapped before trying to land on it

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Message-Id: <20201108051730.2042693-14-dima@arista.com>
Date:   Sun,  8 Nov 2020 05:17:23 +0000
From:   Dmitry Safonov <dima@...sta.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Dmitry Safonov <dima@...sta.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Guo Ren <guoren@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will@...nel.org>, x86@...nel.org
Subject: [PATCH 13/19] x86/signal: Check if vdso_image_32 is mapped before trying to land on it

Provide current_has_vdso_image_32() helper and check it apriory landing
attempt on vdso vma.
The helper is a macro, not a static inline funciton to avoid
linux/sched/task_stack.h inclusion in asm/vdso.h.

Signed-off-by: Dmitry Safonov <dima@...sta.com>
---
 arch/x86/entry/common.c     | 7 ++++++-
 arch/x86/ia32/ia32_signal.c | 4 ++--
 arch/x86/include/asm/vdso.h | 4 ++++
 arch/x86/kernel/signal.c    | 4 ++--
 4 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 870efeec8bda..1be1bdbe55d4 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -142,11 +142,16 @@ static noinstr bool __do_fast_syscall_32(struct pt_regs *regs)
 /* Returns 0 to return using IRET or 1 to return using SYSEXIT/SYSRETL. */
 __visible noinstr long do_fast_syscall_32(struct pt_regs *regs)
 {
+	unsigned long landing_pad;
+
+	if (!current_has_vdso_image_32())
+		force_sigsegv(SIGSEGV);
+
 	/*
 	 * Called using the internal vDSO SYSENTER/SYSCALL32 calling
 	 * convention.  Adjust regs so it looks like we entered using int80.
 	 */
-	unsigned long landing_pad = (unsigned long)current->mm->context.vdso +
+	landing_pad = (unsigned long)current->mm->context.vdso +
 					vdso_image_32.sym_int80_landing_pad;
 
 	/*
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index ea3db15b57bf..f87ed1d53938 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -255,7 +255,7 @@ int ia32_setup_frame(int sig, struct ksignal *ksig,
 		restorer = ksig->ka.sa.sa_restorer;
 	} else {
 		/* Return stub is in 32bit vsyscall page */
-		if (current->mm->context.vdso)
+		if (current_has_vdso_image_32())
 			restorer = current->mm->context.vdso +
 				vdso_image_32.sym___kernel_sigreturn;
 		else
@@ -336,7 +336,7 @@ int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
 
 	if (ksig->ka.sa.sa_flags & SA_RESTORER)
 		restorer = ksig->ka.sa.sa_restorer;
-	else if (current->mm->context.vdso)
+	else if (current_has_vdso_image_32())
 		restorer = current->mm->context.vdso +
 			vdso_image_32.sym___kernel_rt_sigreturn;
 	else
diff --git a/arch/x86/include/asm/vdso.h b/arch/x86/include/asm/vdso.h
index bbcdc7b8f963..a19e0a7bae2d 100644
--- a/arch/x86/include/asm/vdso.h
+++ b/arch/x86/include/asm/vdso.h
@@ -39,6 +39,10 @@ extern const struct vdso_image vdso_image_x32;
 
 #if defined CONFIG_X86_32 || defined CONFIG_COMPAT
 extern const struct vdso_image vdso_image_32;
+
+#define current_has_vdso_image_32()					\
+	likely(current->mm->context.vdso_image == &vdso_image_32 &&	\
+		!!current->mm->context.vdso)
 #endif
 
 extern void __init init_vdso_image(const struct vdso_image *image);
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 372ec09dc4ac..6fed2e523e0a 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -319,7 +319,7 @@ __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
 	unsafe_put_user(set->sig[1], &frame->extramask[0], Efault);
 	if (ksig->ka.sa.sa_flags & SA_RESTORER)
 		restorer = ksig->ka.sa.sa_restorer;
-	else if (current->mm->context.vdso)
+	else if (current_has_vdso_image_32())
 		restorer = current->mm->context.vdso +
 			vdso_image_32.sym___kernel_sigreturn;
 	else
@@ -381,7 +381,7 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
 	/* Set up to return from userspace.  */
 	if (ksig->ka.sa.sa_flags & SA_RESTORER)
 		restorer = ksig->ka.sa.sa_restorer;
-	else if (current->mm->context.vdso)
+	else if (current_has_vdso_image_32())
 		restorer = current->mm->context.vdso +
 			vdso_image_32.sym___kernel_rt_sigreturn;
 	else
-- 
2.28.0