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Tejun Heo ce36394269 mmap: fix petty bug in anonymous shared mmap offset handling 
Anonymous mappings should ignore offset but shared anonymous mapping
forgot to clear it and makes the following legit test program trigger
SIGBUS.

 #include <sys/mman.h>
 #include <stdio.h>
 #include <errno.h>

 #define PAGE_SIZE	4096

 int main(void)
 {
	 char *p;
	 int i;

	 p = mmap(NULL, 2 * PAGE_SIZE, PROT_READ|PROT_WRITE,
		  MAP_SHARED|MAP_ANONYMOUS, -1, PAGE_SIZE);
	 if (p == MAP_FAILED) {
		 perror("mmap");
		 return 1;
	 }

	 for (i = 0; i < 2; i++) {
		 printf("page %d\n", i);
		 p[i * 4096] = i;
	 }
	 return 0;
 }

Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Hugh Dickins <hugh@veritas.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-09-03 19:58:53 -07:00
..
allocpercpu.c
backing-dev.c
bootmem.c bootmem: fix aligning of node-relative indexes and offsets 2008-08-20 15:40:31 -07:00
bounce.c
dmapool.c
fadvise.c
filemap.c VFS: fix dio write returning EIO when try_to_release_page fails 2008-09-02 19:21:37 -07:00
filemap_xip.c mm: xip/ext2 fix block allocation race 2008-08-20 15:40:32 -07:00
fremap.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
highmem.c
hugetlb.c allocate structures for reservation tracking in hugetlbfs outside of spinlocks v2 2008-08-12 16:07:28 -07:00
internal.h
Kconfig mm: Make generic weak get_user_pages_fast and EXPORT_GPL it 2008-08-12 17:52:53 +10:00
maccess.c
madvise.c madvise: update function comment of madvise_dontneed 2008-07-30 09:41:45 -07:00
Makefile mmu-notifiers: core 2008-07-28 16:30:21 -07:00
memcontrol.c memcg: fix oops in mem_cgroup_shrink_usage 2008-08-12 16:07:28 -07:00
memory.c mm: rename page trylock 2008-08-04 21:31:34 -07:00
memory_hotplug.c
mempolicy.c do_migrate_pages(): remove unused variable 2008-08-12 16:07:29 -07:00
mempool.c
migrate.c mm: rename page trylock 2008-08-04 21:31:34 -07:00
mincore.c
mlock.c mlock() fix return values 2008-08-04 16:58:45 -07:00
mm_init.c mm: mminit_loglevel cannot be __meminitdata anymore 2008-08-20 15:40:30 -07:00
mmap.c mmap: fix petty bug in anonymous shared mmap offset handling 2008-09-03 19:58:53 -07:00
mmu_notifier.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
mmzone.c
mprotect.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
mremap.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
msync.c
nommu.c nommu: Provide vmalloc_exec(). 2008-08-04 16:01:47 +09:00
oom_kill.c security: Fix setting of PF_SUPERPRIV by __capable() 2008-08-14 22:59:43 +10:00
page-writeback.c
page_alloc.c mm/bootmem: silence section mismatch warning - contig_page_data/bootmem_node_data 2008-09-02 19:21:37 -07:00
page_io.c
page_isolation.c Remove '#include <stddef.h>' from mm/page_isolation.c 2008-09-02 09:29:01 +01:00
pagewalk.c
pdflush.c
prio_tree.c
quicklist.c mm: size of quicklists shouldn't be proportional to the number of CPUs 2008-09-02 19:21:38 -07:00
readahead.c
rmap.c mm: dirty page tracking race fix 2008-08-20 15:40:32 -07:00
shmem.c mm: rename page trylock 2008-08-04 21:31:34 -07:00
shmem_acl.c
slab.c mm: unexport ksize 2008-07-29 23:44:26 +03:00
slob.c mm: unexport ksize 2008-07-29 23:44:26 +03:00
slub.c slub: Disable NUMA remote node defragmentation by default 2008-08-20 21:50:21 +03:00
sparse-vmemmap.c
sparse.c mm/sparse.c: removed duplicated include 2008-08-12 16:07:30 -07:00
swap.c mm: rename page trylock 2008-08-04 21:31:34 -07:00
swap_state.c mm: show free swap as signed 2008-08-20 15:40:30 -07:00
swapfile.c mm: rename page trylock 2008-08-04 21:31:34 -07:00
thrash.c
tiny-shmem.c
truncate.c VFS: fix dio write returning EIO when try_to_release_page fails 2008-09-02 19:21:37 -07:00
util.c mm: Make generic weak get_user_pages_fast and EXPORT_GPL it 2008-08-12 17:52:53 +10:00
vmalloc.c
vmscan.c mm: rename page trylock 2008-08-04 21:31:34 -07:00
vmstat.c [ARM] Skip memory holes in FLATMEM when reading /proc/pagetypeinfo 2008-08-27 20:09:28 +01:00