From patchwork Tue Feb 7 22:48:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason A. 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Donenfeld" To: mst@redhat.com, qemu-devel@nongnu.org Cc: "Jason A. Donenfeld" , Dov Murik , Tom Lendacky , Gerd Hoffmann , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Paolo Bonzini , Richard Henderson Subject: [PATCH 1/2] x86: reset rng seed when reading cmdline, not kernel image Date: Tue, 7 Feb 2023 19:48:46 -0300 Message-Id: <20230207224847.94429-2-Jason@zx2c4.com> In-Reply-To: <20230207224847.94429-1-Jason@zx2c4.com> References: <20230207224847.94429-1-Jason@zx2c4.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2604:1380:4641:c500::1; envelope-from=SRS0=KxRu=6D=zx2c4.com=Jason@kernel.org; helo=dfw.source.kernel.org X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org With eac7a7791bb6 ("x86: don't let decompressed kernel image clobber setup_data"), the rng seed setup_data is now appended to the cmdline file rather than the kernel image file. But in the process, the code to re-randomize the seed when selecting the image was left out. So, change the re-randomization over to trigger when selecting the cmdline, rather than the kernel image. Fixes: eac7a7791bb6 ("x86: don't let decompressed kernel image clobber setup_data") Signed-off-by: Jason A. Donenfeld --- hw/i386/x86.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/hw/i386/x86.c b/hw/i386/x86.c index eaff4227bd..c6d7bf6db2 100644 --- a/hw/i386/x86.c +++ b/hw/i386/x86.c @@ -1114,15 +1114,15 @@ void x86_load_linux(X86MachineState *x86ms, setup_data->len = cpu_to_le32(RNG_SEED_LENGTH); qemu_guest_getrandom_nofail(setup_data->data, RNG_SEED_LENGTH); qemu_register_reset_nosnapshotload(reset_rng_seed, setup_data); - fw_cfg_add_bytes_callback(fw_cfg, FW_CFG_KERNEL_DATA, reset_rng_seed, NULL, - setup_data, kernel, kernel_size, true); + fw_cfg_add_bytes_callback(fw_cfg, FW_CFG_CMDLINE_DATA, reset_rng_seed, NULL, + setup_data, kernel_cmdline, cmdline_size, true); } else { - fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA, kernel, kernel_size); + fw_cfg_add_bytes(fw_cfg, FW_CFG_CMDLINE_DATA, kernel_cmdline, cmdline_size); } + fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA, kernel, kernel_size); fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_ADDR, cmdline_addr); fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_SIZE, cmdline_size); - fw_cfg_add_bytes(fw_cfg, FW_CFG_CMDLINE_DATA, kernel_cmdline, cmdline_size); sev_load_ctx.cmdline_data = (char *)kernel_cmdline; sev_load_ctx.cmdline_size = cmdline_size;