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e7b390d7e6
https://review.lineageos.org/q/topic:%22n-asb-2023-06%22 Signed-off-by: Tad <tad@spotco.us>
85 lines
3.5 KiB
Diff
85 lines
3.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Brian Delwiche <delwiche@google.com>
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Date: Tue, 21 Mar 2023 22:39:16 +0000
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Subject: [PATCH] Revert "Revert "Fix wrong BR/EDR link key downgrades
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(P_256->P_192)""
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This reverts commit d733c86cbc06ce0ec72216b9d41e172d1939c46f.
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Function btm_sec_encrypt_change() is called at most places
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with argument "encr_enable" treated as bool and not as per
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(tHCI_ENCRYPT_MODE = 0/1/2) expected by the function. The
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function has special handling for "encr_enable=1" to downgrade
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the link key type for BR/EDR case. This gets executed even
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when the caller/context did not mean/expect so. It appears
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this handling in btm_sec_encrypt_change() is not necessary and
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is removed by this commit to prevent accidental execution of it.
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Test: Verified re-pairing with an iPhone works fine now
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Issue Reproduction Steps:
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1. Enable Bluetooth Hotspot on Android device (DUT).
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2. Pair and connect an iPhone to DUT.
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3. Forget this pairing on DUT.
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4. On iPhone settings, click on old DUT's paired entry to connect.
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5. iPhone notifies to click 'Forget Device' and try fresh pairing.
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6. On iPhone, after doing 'Forget Device', discover DUT again.
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7. Attempt pairing to DUT by clicking on discovered DUT entry.
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Pairing will be unsuccessful.
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Issue Cause:
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During re-pairing, DUT is seen to downgrade
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BR/EDR link key unexpectedly from link key type 0x8
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(BTM_LKEY_TYPE_AUTH_COMB_P_256) to 0x5 (BTM_LKEY_TYPE_AUTH_COMB).
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Log snippet (re-pairing time):
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btm_sec_link_key_notification set new_encr_key_256 to 1
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btif_dm_auth_cmpl_evt: Storing link key. key_type=0x8, bond_type=1
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btm_sec_encrypt_change new_encr_key_256 is 1
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--On DUT, HCI_Encryption_Key_Refresh_Complete event noticed---
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btm_sec_encrypt_change new_encr_key_256 is 0
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updated link key type to 5
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btif_dm_auth_cmpl_evt: Storing link key. key_type=0x5, bond_type=1
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This is a backport of the following patch: aosp/1890096
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Bug: 258834033
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Reason for revert: Reinstate original change for QPR
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:56891eedc68c86b40977191dad28d65ebf86a94f)
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Merged-In: Iba0c220b82bcf6b15368762b7052a3987ccbc0c6
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Change-Id: Iba0c220b82bcf6b15368762b7052a3987ccbc0c6
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---
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stack/btm/btm_sec.c | 18 ------------------
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1 file changed, 18 deletions(-)
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diff --git a/stack/btm/btm_sec.c b/stack/btm/btm_sec.c
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index 175fefeae..f8884b917 100644
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--- a/stack/btm/btm_sec.c
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+++ b/stack/btm/btm_sec.c
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@@ -4348,24 +4348,6 @@ void btm_sec_encrypt_change (UINT16 handle, UINT8 status, UINT8 encr_enable)
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}
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}
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}
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- else
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- {
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- // BR/EDR is successfully encrypted. Correct LK type if needed
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- // (BR/EDR LK derived from LE LTK was used for encryption)
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- if ((encr_enable == 1) && /* encryption is ON for SSP */
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- /* LK type is for BR/EDR SC */
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- (p_dev_rec->link_key_type == BTM_LKEY_TYPE_UNAUTH_COMB_P_256 ||
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- p_dev_rec->link_key_type == BTM_LKEY_TYPE_AUTH_COMB_P_256))
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- {
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- if (p_dev_rec->link_key_type == BTM_LKEY_TYPE_UNAUTH_COMB_P_256)
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- p_dev_rec->link_key_type = BTM_LKEY_TYPE_UNAUTH_COMB;
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- else /* BTM_LKEY_TYPE_AUTH_COMB_P_256 */
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- p_dev_rec->link_key_type = BTM_LKEY_TYPE_AUTH_COMB;
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-
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- BTM_TRACE_DEBUG("updated link key type to %d", p_dev_rec->link_key_type);
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- btm_send_link_key_notif(p_dev_rec);
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- }
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- }
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}
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#else
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btm_sec_check_pending_enc_req (p_dev_rec, BT_TRANSPORT_BR_EDR, encr_enable);
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