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authorAndrey Ryabinin <a.ryabinin@samsung.com>2015-02-27 20:44:21 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-02 05:43:51 +0300
commitf4c72c70308897bd26f2918979d06b429916fd0e (patch)
tree692548f2229b1191f6c6dc5bd87d6afb98fedd01 /drivers/android
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
downloadlinux-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.c10
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;