diff options
| author | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2018-07-13 14:06:00 -0400 |
|---|---|---|
| committer | James Morris <james.morris@microsoft.com> | 2018-07-16 12:31:57 -0700 |
| commit | fed2512a7ccc8fc4b8e1de22925d127e4caac300 (patch) | |
| tree | ff667da0a4a8e305409d7c5323c58c7852e40e3b /security/integrity/ima/ima_main.c | |
| parent | 6e852651f28eee851069c7d40989281fae4bf9d2 (diff) | |
| download | lwn-fed2512a7ccc8fc4b8e1de22925d127e4caac300.tar.gz lwn-fed2512a7ccc8fc4b8e1de22925d127e4caac300.zip | |
ima: based on policy require signed firmware (sysfs fallback)
With an IMA policy requiring signed firmware, this patch prevents
the sysfs fallback method of loading firmware.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Matthew Garrett <mjg59@google.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
Diffstat (limited to 'security/integrity/ima/ima_main.c')
| -rw-r--r-- | security/integrity/ima/ima_main.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 71fecfef0939..e467664965e7 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -472,8 +472,10 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size, if (!file && read_id == READING_FIRMWARE) { if ((ima_appraise & IMA_APPRAISE_FIRMWARE) && - (ima_appraise & IMA_APPRAISE_ENFORCE)) + (ima_appraise & IMA_APPRAISE_ENFORCE)) { + pr_err("Prevent firmware loading_store.\n"); return -EACCES; /* INTEGRITY_UNKNOWN */ + } return 0; } @@ -517,6 +519,12 @@ int ima_load_data(enum kernel_load_data_id id) pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file_load syscall.\n"); return -EACCES; /* INTEGRITY_UNKNOWN */ } + break; + case LOADING_FIRMWARE: + if (ima_appraise & IMA_APPRAISE_FIRMWARE) { + pr_err("Prevent firmware sysfs fallback loading.\n"); + return -EACCES; /* INTEGRITY_UNKNOWN */ + } default: break; } |