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Donenfeld" To: linux-efi@vger.kernel.org, linux-crypto@vger.kernel.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, ardb@kernel.org Cc: "Jason A. Donenfeld" Subject: [PATCH v3 0/5] Use EFI variables for random seed Date: Tue, 22 Nov 2022 03:03:59 +0100 Message-Id: <20221122020404.3476063-1-Jason@zx2c4.com> MIME-Version: 1.0 X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1750160180623425291?= X-GMAIL-MSGID: =?utf-8?q?1750160180623425291?= EFI has a rather unique benefit that it has access to some limited non-volatile storage, where the kernel can store a random seed. This series wires that up, with EFISTUB reading the seed and passing it to the kernel, and with the kernel writing a new seed when the RNG is initialized. Patches 1 and 2 are to go through Ard's EFI tree, while patches 3, 4, and 5 are to go through my RNG tree. Jason A. Donenfeld (5): efi: vars: prohibit reading random seed variables efi: stub: use random seed from EFI variable random: add back async readiness notifier vsprintf: initialize siphash key using notifier efi: random: refresh non-volatile random seed when RNG is initialized drivers/char/random.c | 22 +++++++++++ drivers/firmware/efi/efi.c | 19 +++++++++ drivers/firmware/efi/libstub/random.c | 55 +++++++++++++++++++++------ fs/efivarfs/inode.c | 4 ++ fs/efivarfs/super.c | 3 ++ include/linux/random.h | 1 + lib/vsprintf.c | 14 +++---- 7 files changed, 97 insertions(+), 21 deletions(-)