David Howells 81759b5b22 nommu: fix race between ramfs truncation and shared mmap ... Fix the race between the truncation of a ramfs file and an attempt to make a shared mmap of region of that file. The problem is that do_mmap_pgoff() calls f_op->get_unmapped_area() to verify that the file region is made of contiguous pages and to find its base address - but there isn't any locking to guarantee this region until vma_prio_tree_insert() is called by add_vma_to_mm(). Note that moving the functionality into f_op->mmap() doesn't help as that is also called before vma_prio_tree_insert(). Instead make ramfs_nommu_check_mappings() grab nommu_region_sem whilst it does its checks. This means that this function will wait whilst mmaps take place. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Greg Ungerer <gerg@snapgear.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2010-01-16 12:15:40 -08:00
..
file-mmu.c	ramfs: enable splice write	2008-07-04 09:52:14 +02:00
file-nommu.c	nommu: fix race between ramfs truncation and shared mmap	2010-01-16 12:15:40 -08:00
inode.c	ramfs: move RAMFS_MAGIC to include/linux/magic.h	2009-09-23 07:39:42 -07:00
internal.h
Makefile