diff options
author | Andrey Ryabinin <a.ryabinin@samsung.com> | 2015-02-27 20:44:21 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-02 05:43:51 +0300 |
commit | f4c72c70308897bd26f2918979d06b429916fd0e (patch) | |
tree | 692548f2229b1191f6c6dc5bd87d6afb98fedd01 /drivers/android | |
parent | c517d838eb7d07bbe9507871fab3931deccff539 (diff) | |
download | linux-f4c72c70308897bd26f2918979d06b429916fd0e.tar.xz |
android: binder: fix binder mmap failures
binder_update_page_range() initializes only addr and size
fields in 'struct vm_struct tmp_area;' and passes it to
map_vm_area().
Before 71394fe50146 ("mm: vmalloc: add flag preventing guard hole allocation")
this was because map_vm_area() didn't use any other fields
in vm_struct except addr and size.
Now get_vm_area_size() (used in map_vm_area()) reads vm_struct's
flags to determine whether vm area has guard hole or not.
binder_update_page_range() don't initialize flags field, so
this causes following binder mmap failures:
-----------[ cut here ]------------
WARNING: CPU: 0 PID: 1971 at mm/vmalloc.c:130
vmap_page_range_noflush+0x119/0x144()
CPU: 0 PID: 1971 Comm: healthd Not tainted 4.0.0-rc1-00399-g7da3fdc-dirty #157
Hardware name: ARM-Versatile Express
[<c001246d>] (unwind_backtrace) from [<c000f7f9>] (show_stack+0x11/0x14)
[<c000f7f9>] (show_stack) from [<c049a221>] (dump_stack+0x59/0x7c)
[<c049a221>] (dump_stack) from [<c001cf21>] (warn_slowpath_common+0x55/0x84)
[<c001cf21>] (warn_slowpath_common) from [<c001cfe3>]
(warn_slowpath_null+0x17/0x1c)
[<c001cfe3>] (warn_slowpath_null) from [<c00c66c5>]
(vmap_page_range_noflush+0x119/0x144)
[<c00c66c5>] (vmap_page_range_noflush) from [<c00c716b>] (map_vm_area+0x27/0x48)
[<c00c716b>] (map_vm_area) from [<c038ddaf>]
(binder_update_page_range+0x12f/0x27c)
[<c038ddaf>] (binder_update_page_range) from [<c038e857>]
(binder_mmap+0xbf/0x1ac)
[<c038e857>] (binder_mmap) from [<c00c2dc7>] (mmap_region+0x2eb/0x4d4)
[<c00c2dc7>] (mmap_region) from [<c00c3197>] (do_mmap_pgoff+0x1e7/0x250)
[<c00c3197>] (do_mmap_pgoff) from [<c00b35b5>] (vm_mmap_pgoff+0x45/0x60)
[<c00b35b5>] (vm_mmap_pgoff) from [<c00c1f39>] (SyS_mmap_pgoff+0x5d/0x80)
[<c00c1f39>] (SyS_mmap_pgoff) from [<c000ce81>] (ret_fast_syscall+0x1/0x5c)
---[ end trace 48c2c4b9a1349e54 ]---
binder: 1982: binder_alloc_buf failed to map page at f0e00000 in kernel
binder: binder_mmap: 1982 b6bde000-b6cdc000 alloc small buf failed -12
Use map_kernel_range_noflush() instead of map_vm_area() as this is better
API for binder's purposes and it allows to get rid of 'vm_struct tmp_area' at all.
Fixes: 71394fe50146 ("mm: vmalloc: add flag preventing guard hole allocation")
Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Reported-by: Amit Pundir <amit.pundir@linaro.org>
Tested-by: Amit Pundir <amit.pundir@linaro.org>
Acked-by: David Rientjes <rientjes@google.com>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/android')
-rw-r--r-- | drivers/android/binder.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 33b09b6568a4..6607f3c6ace1 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -551,7 +551,6 @@ static int binder_update_page_range(struct binder_proc *proc, int allocate, { void *page_addr; unsigned long user_page_addr; - struct vm_struct tmp_area; struct page **page; struct mm_struct *mm; @@ -600,10 +599,11 @@ static int binder_update_page_range(struct binder_proc *proc, int allocate, proc->pid, page_addr); goto err_alloc_page_failed; } - tmp_area.addr = page_addr; - tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */; - ret = map_vm_area(&tmp_area, PAGE_KERNEL, page); - if (ret) { + ret = map_kernel_range_noflush((unsigned long)page_addr, + PAGE_SIZE, PAGE_KERNEL, page); + flush_cache_vmap((unsigned long)page_addr, + (unsigned long)page_addr + PAGE_SIZE); + if (ret != 1) { pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n", proc->pid, page_addr); goto err_map_kernel_failed; |