linux-kernel - [tip:x86/vdso] x86, vdso: Fix size of get_unmapped

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Mon, 24 Mar 2014 10:04:27 -0700
From:	tip-bot for Stefani Seibold <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, luto@...capital.net, hpa@...or.com,
	mingo@...nel.org, stefani@...bold.net, tglx@...utronix.de,
	hpa@...ux.intel.com
Subject: [tip:x86/vdso] x86, vdso: Fix size of get_unmapped_area()

Commit-ID:  645a387ecbdb4aa78c8451a66416340616134537
Gitweb:     http://git.kernel.org/tip/645a387ecbdb4aa78c8451a66416340616134537
Author:     Stefani Seibold <stefani@...bold.net>
AuthorDate: Sun, 23 Mar 2014 17:38:14 +0100
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Mon, 24 Mar 2014 09:31:23 -0700

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.

Signed-off-by: Stefani Seibold <stefani@...bold.net>
Cc: Andy Lutomirski <luto@...capital.net>
Link: http://lkml.kernel.org/r/1395592694-20571-1-git-send-email-stefani@seibold.net
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 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;
 
 	/*
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/