From: Tushar Sugandhi <tusharsu@linux.microsoft.com> To: zohar@linux.ibm.com, roberto.sassu@huaweicloud.com, roberto.sassu@huawei.com, eric.snowberg@oracle.com, stefanb@linux.ibm.com, ebiederm@xmission.com, noodles@fb.com, bauermann@kolabnow.com, linux-integrity@vger.kernel.org, kexec@lists.infradead.org Cc: code@tyhicks.com, nramas@linux.microsoft.com, paul@paul-moore.com Subject: [PATCH v5 5/8] ima: kexec: move IMA log copy from kexec load to execute Date: Wed, 14 Feb 2024 07:38:24 -0800 [thread overview] Message-ID: <20240214153827.1087657-6-tusharsu@linux.microsoft.com> (raw) In-Reply-To: <20240214153827.1087657-1-tusharsu@linux.microsoft.com> ima_dump_measurement_list() is called during kexec 'load', which may result in loss of IMA measurements during kexec soft reboot. It needs to be called during kexec 'execute'. This patch includes the following changes: - Call kimage_file_post_load() from kexec_file_load() syscall only for kexec soft reboot scenarios and not for KEXEC_FILE_ON_CRASH. It will map the IMA segment, and register reboot notifier for the function ima_update_kexec_buffer() which would copy the IMA log at kexec soft reboot. - Make kexec_segment_size variable local static to the file, for it to be accessible both during kexec 'load' and 'execute'. - Move ima_dump_measurement_list() call from ima_add_kexec_buffer() to ima_update_kexec_buffer(). - Remove ima_reset_kexec_file() call from ima_add_kexec_buffer(), now that the buffer is being copied at kexec 'execute', and resetting the file at kexec 'load' will corrupt the buffer. Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com> --- kernel/kexec_file.c | 3 ++ security/integrity/ima/ima_kexec.c | 45 +++++++++++++++++++----------- 2 files changed, 32 insertions(+), 16 deletions(-) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index fe59cb7c179d..2d5df320c34f 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -410,6 +410,9 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, kimage_terminate(image); + if (!(flags & KEXEC_FILE_ON_CRASH)) + kimage_file_post_load(image); + ret = machine_kexec_post_load(image); if (ret) goto out; diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c index 1d4d6c122d82..98fc9b9782a2 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -19,6 +19,7 @@ #ifdef CONFIG_IMA_KEXEC static struct seq_file ima_kexec_file; static void *ima_kexec_buffer; +static size_t kexec_segment_size; static bool ima_kexec_update_registered; static void ima_reset_kexec_file(struct seq_file *sf) @@ -129,7 +130,6 @@ void ima_add_kexec_buffer(struct kimage *image) /* use more understandable variable names than defined in kbuf */ void *kexec_buffer = NULL; size_t kexec_buffer_size; - size_t kexec_segment_size; int ret; /* @@ -154,14 +154,6 @@ void ima_add_kexec_buffer(struct kimage *image) return; } - ret = ima_dump_measurement_list(&kexec_buffer_size, &kexec_buffer, - kexec_segment_size); - if (ret < 0) { - pr_err("%s: Failed to dump IMA measurements. Error:%d.\n", - __func__, ret); - return; - } - kbuf.buffer = kexec_buffer; kbuf.bufsz = kexec_buffer_size; kbuf.memsz = kexec_segment_size; @@ -179,12 +171,6 @@ void ima_add_kexec_buffer(struct kimage *image) image->ima_segment_index = image->nr_segments - 1; image->is_ima_segment_index_set = true; - /* - * kexec owns kexec_buffer after kexec_add_buffer() is called - * and it will vfree() that buffer. - */ - ima_reset_kexec_file(&ima_kexec_file); - kexec_dprintk("kexec measurement buffer for the loaded kernel at 0x%lx.\n", kbuf.mem); } @@ -195,7 +181,34 @@ void ima_add_kexec_buffer(struct kimage *image) static int ima_update_kexec_buffer(struct notifier_block *self, unsigned long action, void *data) { - return NOTIFY_OK; + void *buf = NULL; + size_t buf_size; + int ret = NOTIFY_OK; + + if (!kexec_in_progress) { + pr_info("%s: No kexec in progress.\n", __func__); + return ret; + } + + if (!ima_kexec_buffer) { + pr_err("%s: Kexec buffer not set.\n", __func__); + return ret; + } + + ret = ima_dump_measurement_list(&buf_size, &buf, + kexec_segment_size); + + if (!buf) { + pr_err("%s: Dump measurements failed. Error:%d\n", + __func__, ret); + goto out; + } + memcpy(ima_kexec_buffer, buf, buf_size); +out: + kimage_unmap_segment(ima_kexec_buffer); + ima_kexec_buffer = NULL; + + return ret; } struct notifier_block update_buffer_nb = { -- 2.25.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
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From: Tushar Sugandhi <tusharsu@linux.microsoft.com> To: zohar@linux.ibm.com, roberto.sassu@huaweicloud.com, roberto.sassu@huawei.com, eric.snowberg@oracle.com, stefanb@linux.ibm.com, ebiederm@xmission.com, noodles@fb.com, bauermann@kolabnow.com, linux-integrity@vger.kernel.org, kexec@lists.infradead.org Cc: code@tyhicks.com, nramas@linux.microsoft.com, paul@paul-moore.com Subject: [PATCH v5 5/8] ima: kexec: move IMA log copy from kexec load to execute Date: Wed, 14 Feb 2024 07:38:24 -0800 [thread overview] Message-ID: <20240214153827.1087657-6-tusharsu@linux.microsoft.com> (raw) In-Reply-To: <20240214153827.1087657-1-tusharsu@linux.microsoft.com> ima_dump_measurement_list() is called during kexec 'load', which may result in loss of IMA measurements during kexec soft reboot. It needs to be called during kexec 'execute'. This patch includes the following changes: - Call kimage_file_post_load() from kexec_file_load() syscall only for kexec soft reboot scenarios and not for KEXEC_FILE_ON_CRASH. It will map the IMA segment, and register reboot notifier for the function ima_update_kexec_buffer() which would copy the IMA log at kexec soft reboot. - Make kexec_segment_size variable local static to the file, for it to be accessible both during kexec 'load' and 'execute'. - Move ima_dump_measurement_list() call from ima_add_kexec_buffer() to ima_update_kexec_buffer(). - Remove ima_reset_kexec_file() call from ima_add_kexec_buffer(), now that the buffer is being copied at kexec 'execute', and resetting the file at kexec 'load' will corrupt the buffer. Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com> --- kernel/kexec_file.c | 3 ++ security/integrity/ima/ima_kexec.c | 45 +++++++++++++++++++----------- 2 files changed, 32 insertions(+), 16 deletions(-) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index fe59cb7c179d..2d5df320c34f 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -410,6 +410,9 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, kimage_terminate(image); + if (!(flags & KEXEC_FILE_ON_CRASH)) + kimage_file_post_load(image); + ret = machine_kexec_post_load(image); if (ret) goto out; diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c index 1d4d6c122d82..98fc9b9782a2 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -19,6 +19,7 @@ #ifdef CONFIG_IMA_KEXEC static struct seq_file ima_kexec_file; static void *ima_kexec_buffer; +static size_t kexec_segment_size; static bool ima_kexec_update_registered; static void ima_reset_kexec_file(struct seq_file *sf) @@ -129,7 +130,6 @@ void ima_add_kexec_buffer(struct kimage *image) /* use more understandable variable names than defined in kbuf */ void *kexec_buffer = NULL; size_t kexec_buffer_size; - size_t kexec_segment_size; int ret; /* @@ -154,14 +154,6 @@ void ima_add_kexec_buffer(struct kimage *image) return; } - ret = ima_dump_measurement_list(&kexec_buffer_size, &kexec_buffer, - kexec_segment_size); - if (ret < 0) { - pr_err("%s: Failed to dump IMA measurements. Error:%d.\n", - __func__, ret); - return; - } - kbuf.buffer = kexec_buffer; kbuf.bufsz = kexec_buffer_size; kbuf.memsz = kexec_segment_size; @@ -179,12 +171,6 @@ void ima_add_kexec_buffer(struct kimage *image) image->ima_segment_index = image->nr_segments - 1; image->is_ima_segment_index_set = true; - /* - * kexec owns kexec_buffer after kexec_add_buffer() is called - * and it will vfree() that buffer. - */ - ima_reset_kexec_file(&ima_kexec_file); - kexec_dprintk("kexec measurement buffer for the loaded kernel at 0x%lx.\n", kbuf.mem); } @@ -195,7 +181,34 @@ void ima_add_kexec_buffer(struct kimage *image) static int ima_update_kexec_buffer(struct notifier_block *self, unsigned long action, void *data) { - return NOTIFY_OK; + void *buf = NULL; + size_t buf_size; + int ret = NOTIFY_OK; + + if (!kexec_in_progress) { + pr_info("%s: No kexec in progress.\n", __func__); + return ret; + } + + if (!ima_kexec_buffer) { + pr_err("%s: Kexec buffer not set.\n", __func__); + return ret; + } + + ret = ima_dump_measurement_list(&buf_size, &buf, + kexec_segment_size); + + if (!buf) { + pr_err("%s: Dump measurements failed. Error:%d\n", + __func__, ret); + goto out; + } + memcpy(ima_kexec_buffer, buf, buf_size); +out: + kimage_unmap_segment(ima_kexec_buffer); + ima_kexec_buffer = NULL; + + return ret; } struct notifier_block update_buffer_nb = { -- 2.25.1
next prev parent reply other threads:[~2024-02-14 15:38 UTC|newest] Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-02-14 15:38 [PATCH v5 0/8] ima: kexec: measure events between kexec load and execute Tushar Sugandhi 2024-02-14 15:38 ` Tushar Sugandhi 2024-02-14 15:38 ` [PATCH v5 1/8] ima: define and call ima_alloc_kexec_file_buf Tushar Sugandhi 2024-02-14 15:38 ` Tushar Sugandhi 2024-02-19 22:16 ` Stefan Berger 2024-02-19 22:16 ` Stefan Berger 2024-02-21 0:12 ` Mimi Zohar 2024-02-21 0:12 ` Mimi Zohar 2024-02-14 15:38 ` [PATCH v5 2/8] kexec: define functions to map and unmap segments Tushar Sugandhi 2024-02-14 15:38 ` Tushar Sugandhi 2024-02-14 19:43 ` Stefan Berger 2024-02-14 19:43 ` Stefan Berger 2024-02-15 6:13 ` Tushar Sugandhi 2024-02-15 6:13 ` Tushar Sugandhi 2024-02-21 20:22 ` Mimi Zohar 2024-02-21 20:22 ` Mimi Zohar 2024-02-14 15:38 ` [PATCH v5 3/8] ima: kexec: skip IMA segment validation after kexec soft reboot Tushar Sugandhi 2024-02-14 15:38 ` Tushar Sugandhi 2024-02-14 15:38 ` [PATCH v5 4/8] ima: kexec: define functions to copy IMA log at soft boot Tushar Sugandhi 2024-02-14 15:38 ` Tushar Sugandhi 2024-02-14 20:47 ` Stefan Berger 2024-02-14 20:47 ` Stefan Berger 2024-02-15 6:55 ` Tushar Sugandhi 2024-02-15 6:55 ` Tushar Sugandhi 2024-02-21 21:52 ` Mimi Zohar 2024-02-21 21:52 ` Mimi Zohar 2024-02-21 22:39 ` Mimi Zohar 2024-02-21 22:39 ` Mimi Zohar 2024-03-01 11:12 ` Petr Tesařík 2024-03-01 11:12 ` Petr Tesařík 2024-02-14 15:38 ` Tushar Sugandhi [this message] 2024-02-14 15:38 ` [PATCH v5 5/8] ima: kexec: move IMA log copy from kexec load to execute Tushar Sugandhi 2024-02-14 20:58 ` Stefan Berger 2024-02-14 20:58 ` Stefan Berger 2024-02-22 1:47 ` Mimi Zohar 2024-02-22 1:47 ` Mimi Zohar 2024-05-09 6:32 ` Petr Tesařík 2024-05-09 6:32 ` Petr Tesařík 2024-02-14 15:38 ` [PATCH v5 6/8] ima: suspend measurements during buffer copy at kexec execute Tushar Sugandhi 2024-02-14 15:38 ` Tushar Sugandhi 2024-02-22 14:14 ` Mimi Zohar 2024-02-22 14:14 ` Mimi Zohar 2024-02-22 16:38 ` Mimi Zohar 2024-02-22 16:38 ` Mimi Zohar 2024-02-29 13:21 ` Petr Tesařík 2024-02-29 13:21 ` Petr Tesařík 2024-02-14 15:38 ` [PATCH v5 7/8] ima: make the kexec extra memory configurable Tushar Sugandhi 2024-02-14 15:38 ` Tushar Sugandhi 2024-02-22 14:13 ` Mimi Zohar 2024-02-22 14:13 ` Mimi Zohar 2024-02-14 15:38 ` [PATCH v5 8/8] ima: measure kexec load and exec events as critical data Tushar Sugandhi 2024-02-14 15:38 ` Tushar Sugandhi 2024-02-14 21:00 ` Stefan Berger 2024-02-14 21:00 ` Stefan Berger 2024-02-15 6:57 ` Tushar Sugandhi 2024-02-15 6:57 ` Tushar Sugandhi 2024-02-14 21:03 ` Stefan Berger 2024-02-14 21:03 ` Stefan Berger 2024-02-15 6:58 ` Tushar Sugandhi 2024-02-15 6:58 ` Tushar Sugandhi 2024-02-21 0:15 ` [PATCH v5 0/8] ima: kexec: measure events between kexec load and execute Mimi Zohar 2024-02-21 0:15 ` Mimi Zohar
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