linux-kernel - [PATCH] x86, vdso: fix size of get_unmapped

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Message-Id: <1395592694-20571-1-git-send-email-stefani@seibold.net>
Date:	Sun, 23 Mar 2014 17:38:14 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, ak@...ux.intel.com, aarcange@...hat.com,
	john.stultz@...aro.org, luto@...capital.net, xemul@...allels.com,
	gorcunov@...nvz.org, andriy.shevchenko@...ux.intel.com
Cc:	Martin.Runge@...de-schwarz.com, Andreas.Brief@...de-schwarz.com,
	Stefani Seibold <stefani@...bold.net>
Subject: [PATCH] x86, vdso: fix size of get_unmapped_area()

The size of the reserved memory for a 32 bit vdso must be the size of the
32 bit vDSO in pages + HPET page + VVAR page.

One page is not enough for this. Grrrr.... silly copy and paste bug,
was right in previous patch.

The patch is against 3c1b63b9e4862fb16352a0646439c2dd6d9e0e5c

Signed-off-by: Stefani Seibold <stefani@...bold.net>
---
 arch/x86/vdso/vdso32-setup.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/vdso/vdso32-setup.c b/arch/x86/vdso/vdso32-setup.c
index 791c1cb..0034898 100644
--- a/arch/x86/vdso/vdso32-setup.c
+++ b/arch/x86/vdso/vdso32-setup.c
@@ -165,12 +165,14 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 
 	down_write(&mm->mmap_sem);
 
-	addr = get_unmapped_area(NULL, 0, PAGE_SIZE, 0, 0);
+	addr = get_unmapped_area(NULL, 0, vdso32_size + VDSO_OFFSET(VDSO_PREV_PAGES), 0, 0);
 	if (IS_ERR_VALUE(addr)) {
 		ret = addr;
 		goto up_fail;
 	}
 
+	addr += VDSO_OFFSET(VDSO_PREV_PAGES);
+
 	current->mm->context.vdso = (void *)addr;
 
 	/*
-- 
1.9.1

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