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binder: add flag to clear buffer on txn complete

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commit 0f966cba95c78029f491b433ea95ff38f414a761 upstream.

Add a per-transaction flag to indicate that the buffer
must be cleared when the transaction is complete to
prevent copies of sensitive data from being preserved
in memory.

Signed-off-by: Todd Kjos <tkjos@google.com>
Link: https://lore.kernel.org/r/20201120233743.3617529-1-tkjos@google.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Todd Kjos 2020-11-20 15:37:43 -08:00 • committed by Greg Kroah-Hartman
commit 5fbf84689f
4 changed files with 53 additions and 1 deletions
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1
include/uapi/linux/android/binder.h
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@ -248,6 +248,7 @@ enum transaction_flags {
TF_ROOT_OBJECT = 0x04, /* contents are the component's root object */
TF_STATUS_CODE = 0x08, /* contents are a 32-bit status code */
TF_ACCEPT_FDS = 0x10, /* allow replies with file descriptors */
TF_CLEAR_BUF = 0x20, /* clear buffer on txn complete */
};
struct binder_transaction_data {