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binder: Set end of SG buffer area properly. 

In case the target node requests a security context, the
extra_buffers_size is increased with the size of the security context.
But, that size is not available for use by regular scatter-gather
buffers; make sure the ending of that buffer is marked correctly.

Acked-by: Todd Kjos <tkjos@google.com>
Fixes: ec74136ded ("binder: create node flag to request sender's security context")
Signed-off-by: Martijn Coenen <maco@android.com>
Cc: stable@vger.kernel.org # 5.1+
Link: https://lore.kernel.org/r/20190709110923.220736-1-maco@android.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martijn Coenen 2019-07-09 13:09:23 +02:00 committed by Greg Kroah-Hartman
parent 333a2101f4
commit a565870650
1 changed files with 2 additions and 1 deletions
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3
drivers/android/binder.c
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@ -3239,7 +3239,8 @@ static void binder_transaction(struct binder_proc *proc,
buffer_offset = off_start_offset;
off_end_offset = off_start_offset + tr->offsets_size;
sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
sg_buf_end_offset = sg_buf_offset + extra_buffers_size;
sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
ALIGN(secctx_sz, sizeof(u64));
off_min = 0;
for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
buffer_offset += sizeof(binder_size_t)) {