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s390/qeth: Split memcpy() of struct qeth_ipacmd_addr_change flexible array
To work around a misbehavior of the compiler's ability to see into composite flexible array structs (as detailed in the coming memcpy() hardening series[1]), split the memcpy() of the header and the payload so no false positive run-time overflow warning will be generated. [1] https://lore.kernel.org/linux-hardening/20220901065914.1417829-2-keescook@chromium.org/ Cc: Wenjia Zhang <wenjia@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Reviewed-by: Alexandra Winter <wintera@linux.ibm.com> Link: https://lore.kernel.org/r/20220927003953.1942442-1-keescook@chromium.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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1 changed files with 2 additions and 2 deletions
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@ -1530,8 +1530,8 @@ static void qeth_addr_change_event(struct qeth_card *card,
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else
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INIT_DELAYED_WORK(&data->dwork, qeth_l2_dev2br_worker);
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data->card = card;
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memcpy(&data->ac_event, hostevs,
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sizeof(struct qeth_ipacmd_addr_change) + extrasize);
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data->ac_event = *hostevs;
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memcpy(data->ac_event.entry, hostevs->entry, extrasize);
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queue_delayed_work(card->event_wq, &data->dwork, 0);
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}
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