| 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
| ||
|
Message-ID: <1333452302-5749-1-git-send-email-stefano.stabellini@eu.citrix.com> Date: Tue, 3 Apr 2012 12:25:02 +0100 From: Stefano Stabellini <stefano.stabellini@...citrix.com> To: konrad.wilk@...cle.com CC: Stefano.Stabellini@...citrix.com, xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org, Stefano Stabellini <stefano.stabellini@...citrix.com> Subject: [PATCH] xen/gntdev: do not set VM_PFNMAP Since when we are using the m2p_override it is not true anymore that the mmap'ed area doesn't have corresponsing struct pages. Removing the VM_PFNMAP flag makes get_user_pages work on the mmap'ed user vma. An example test case would be using a Xen userspace block backend (QDISK) on a file on NFS using O_DIRECT. The patch should be backported back to 2.6.38. Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com> --- drivers/xen/gntdev.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 99d8151..1ffd03b 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -722,7 +722,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) vma->vm_flags |= VM_RESERVED|VM_DONTEXPAND; if (use_ptemod) - vma->vm_flags |= VM_DONTCOPY|VM_PFNMAP; + vma->vm_flags |= VM_DONTCOPY; vma->vm_private_data = map; -- 1.7.2.5 -- 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/
Powered by blists - more mailing lists