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BINDER_TYPE_PTR objects point to memory areas in the source process to be copied into the target buffer as part of a transaction. This implements a scatter- gather model where non-contiguous memory in a source process is "gathered" into a contiguous region in the target buffer. The data can include pointers that must be fixed up to correctly point to the copied data. To avoid making source process pointers visible to the target process, this patch defers the copy until the fixups are known and then copies and fixeups are done together. There is a special case of BINDER_TYPE_FDA which applies the fixup later in the target process context. In this case the user data is skipped (so no untranslated fds become visible to the target). Reviewed-by: Martijn Coenen <maco@android.com> Signed-off-by: Todd Kjos <tkjos@google.com> Link: https://lore.kernel.org/r/20211130185152.437403-5-tkjos@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| .. | ||
| binder_alloc_selftest.c | ||
| binder_alloc.c | ||
| binder_alloc.h | ||
| binder_internal.h | ||
| binder_trace.h | ||
| binder.c | ||
| binderfs.c | ||
| Kconfig | ||
| Makefile | ||