From: Derrick Brashear <shadow@dementia.org>
Date: Mon, 31 Jan 2005 04:23:11 +0000 (+0000)
Subject: STABLE14-linux-mmap-ro-means-no-write-20050125
X-Git-Tag: openafs-devel-1_3_78~14
X-Git-Url: https://git.michaelhowe.org/gitweb/?a=commitdiff_plain;h=4af4780deb891f55c0c95ead3f7bb59b7ce263f0;p=packages%2Fo%2Fopenafs.git

STABLE14-linux-mmap-ro-means-no-write-20050125


don't allow a write map of a file which cannot be written to


(cherry picked from commit 96cf60ef3e830d16325fba664044f751ca164f85)
---

diff --git a/src/afs/LINUX/osi_vnodeops.c b/src/afs/LINUX/osi_vnodeops.c
index 333b5bebe..ab196b5fa 100644
--- a/src/afs/LINUX/osi_vnodeops.c
+++ b/src/afs/LINUX/osi_vnodeops.c
@@ -518,6 +518,9 @@ afs_linux_mmap(struct file *fp, struct vm_area_struct *vmap)
     if (!code)
 	code = afs_VerifyVCache(vcp, &treq);
 
+    if (!code && (vcp->states & CRO) && 
+	(vmap->vm_file->f_flags & (FWRITE | FTRUNC)))
+	code = EACCES;
 
     if (code)
 	code = -code;