linux-kernel - [PATCHv3 1/6] x86/vdso: unmap vdso blob on vvar mapping failure

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Date:   Fri, 26 Aug 2016 20:13:12 +0300
From:   Dmitry Safonov <dsafonov@...tuozzo.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <0x7f454c46@...il.com>, <luto@...nel.org>, <oleg@...hat.com>,
        <tglx@...utronix.de>, <hpa@...or.com>, <mingo@...hat.com>,
        <linux-mm@...ck.org>, <x86@...nel.org>, <gorcunov@...nvz.org>,
        <xemul@...tuozzo.com>, Dmitry Safonov <dsafonov@...tuozzo.com>
Subject: [PATCHv3 1/6] x86/vdso: unmap vdso blob on vvar mapping failure

If remapping of vDSO blob failed on vvar mapping,
we need to unmap previously mapped vDSO blob.

Cc: Andy Lutomirski <luto@...nel.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: linux-mm@...ck.org
Cc: x86@...nel.org
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Pavel Emelyanov <xemul@...tuozzo.com>
Signed-off-by: Dmitry Safonov <dsafonov@...tuozzo.com>
Acked-by: Andy Lutomirski <luto@...nel.org>
---
 arch/x86/entry/vdso/vma.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index f840766659a8..3bab6ba3ffc5 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -238,12 +238,14 @@ static int map_vdso(const struct vdso_image *image, bool calculate_addr)
 
 	if (IS_ERR(vma)) {
 		ret = PTR_ERR(vma);
-		goto up_fail;
+		do_munmap(mm, text_start, image->size);
 	}
 
 up_fail:
-	if (ret)
+	if (ret) {
 		current->mm->context.vdso = NULL;
+		current->mm->context.vdso_image = NULL;
+	}
 
 	up_write(&mm->mmap_sem);
 	return ret;
-- 
2.9.0