The patch titled
NOMMU: Fix execution off of ramfs with mmap()
has been removed from the -mm tree. Its filename is
nommu-fix-execution-off-of-ramfs-with-mmap.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: NOMMU: Fix execution off of ramfs with mmap()
From: David Howells <dhowells@xxxxxxxxxx>
Fix execution through the FDPIC binfmt of programs stored on ramfs by
preventing the ramfs mmap() returning successfully on a private mapping of
a ramfs file. This causes NOMMU mmap to make a copy of the mapped portion
of the file and map that instead.
This could be improved by granting direct mapping access to read-only
private mappings for which the data is stored on a contiguous run of pages.
However, this is only likely to be the case if the file was extended with
truncate before being written.
ramfs is left to map the file directly for shared mappings so that SYSV IPC
and POSIX shared memory both still work.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/ramfs/file-nommu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN fs/ramfs/file-nommu.c~nommu-fix-execution-off-of-ramfs-with-mmap fs/ramfs/file-nommu.c
--- a/fs/ramfs/file-nommu.c~nommu-fix-execution-off-of-ramfs-with-mmap
+++ a/fs/ramfs/file-nommu.c
@@ -283,9 +283,9 @@ unsigned long ramfs_nommu_get_unmapped_a
/*****************************************************************************/
/*
- * set up a mapping
+ * set up a mapping for shared memory segments
*/
int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma)
{
- return 0;
+ return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
}
_
Patches currently in -mm which might be from dhowells@xxxxxxxxxx are
origin.patch
git-gfs2.patch
binfmt_elf-consistently-use-loff_t.patch
nommu-export-two-symbols-for-drivers-to-use.patch
ecryptfs-get_sb_dev-fix.patch
reiser4-get_sb_dev-fix.patch
mutex-subsystem-synchro-test-module.patch
-
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