@@ -35,6 +35,7 @@
#include <linux/mmu_context.h>
#include <linux/poll.h>
#include <linux/eventfd.h>
+#include <linux/thread_info.h>
#include "u_fs.h"
#include "u_f.h"
@@ -826,6 +827,10 @@ static void ffs_user_copy_worker(struct work_struct *work)
if (io_data->read && ret > 0) {
mm_segment_t oldfs = get_fs();
+#if defined(CONFIG_ARM64)
+ if (IS_ENABLED(CONFIG_ARM64_TAGGED_ADDR_ABI))
+ set_thread_flag(TIF_TAGGED_ADDR);
+#endif
set_fs(USER_DS);
use_mm(io_data->mm);
ret = ffs_copy_to_iter(io_data->buf, ret, &io_data->data);
This issue was found when adbd trying to open functionfs with AIO mode. Usually, we need to set "setprop sys.usb.ffs.aio_compat 0" to enable adbd with AIO mode on Android. When adbd is opening functionfs, it will try to read 24 bytes at the first read I/O control. If this reading has been failed, adbd will try to send FUNCTIONFS_CLEAR_HALT to functionfs. When adbd is in AIO mode, functionfs will be acted with asyncronized I/O path. After the successful read transfer has been completed by gadget hardware, the following series of functions will be called. ffs_epfile_async_io_complete() -> ffs_user_copy_worker() -> copy_to_iter() -> _copy_to_iter() -> copyout() -> iterate_and_advance() -> iterate_iovec() Adding debug trace to these functions, it has been found that in copyout(), access_ok() will check if the user space address is valid to write. However if CONFIG_ARM64_TAGGED_ADDR_ABI is enabled, adbd always passes user space address start with "0x3C" to gadget's AIO blocks. This tagged address will cause access_ok() check always fail. Which causes later calculation in iterate_iovec() turn zero. Copyout() won't copy data to userspace since the length to be copied "v.iov_len" will be zero. Finally leads ffs_copy_to_iter() always return -EFAULT, causes adbd cannot open functionfs and send FUNCTIONFS_CLEAR_HALT. Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> --- Changes for v3: - Fix misspelling in commit message. Changes for v2: - Fix build error for 32-bit load. An #if defined(CONFIG_ARM64) still need for avoiding undeclared defines. drivers/usb/gadget/function/f_fs.c | 5 +++++ 1 file changed, 5 insertions(+) -- 1.7.9.5