| Message ID | 20220713072111.230333-1-coxu@redhat.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | [v2] ima: force signature verification when CONFIG_KEXEC_SIG is configured | expand |
On Wed, 2022-07-13 at 15:21 +0800, Coiby Xu wrote: > Currently, an unsigned kernel could be kexec'ed when IMA arch specific > policy is configured unless lockdown is enabled. Enforce kernel > signature verification check in the kexec_file_load syscall when IMA > arch specific policy is configured. > > Fixes: 99d5cadfde2b ("kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE") > Reported-by: Mimi Zohar <zohar@linux.ibm.com> > Suggested-by: Mimi Zohar <zohar@linux.ibm.com> > Signed-off-by: Coiby Xu <coxu@redhat.com> > --- > v2 > - don't include linux/kexec.h since it's already been included in > linux/ima.h > - fix build errors when KEXEC_FILE/KEXEC_CORE is disable as caught by > kernel test robot <lkp@intel.com> Thanks, Coiby. This version of the patch is now queued in next- integrity/next- integrity-testing. Mimi
diff --git a/include/linux/kexec.h b/include/linux/kexec.h index ce6536f1d269..475683cd67f1 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -452,6 +452,12 @@ static inline int kexec_crash_loaded(void) { return 0; } #define kexec_in_progress false #endif /* CONFIG_KEXEC_CORE */ +#ifdef CONFIG_KEXEC_SIG +void set_kexec_sig_enforced(void); +#else +static inline void set_kexec_sig_enforced(void) {} +#endif + #endif /* !defined(__ASSEBMLY__) */ #endif /* LINUX_KEXEC_H */ diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index 145321a5e798..f9261c07b048 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -29,6 +29,15 @@ #include <linux/vmalloc.h> #include "kexec_internal.h" +#ifdef CONFIG_KEXEC_SIG +static bool sig_enforce = IS_ENABLED(CONFIG_KEXEC_SIG_FORCE); + +void set_kexec_sig_enforced(void) +{ + sig_enforce = true; +} +#endif + static int kexec_calculate_store_digests(struct kimage *image); /* @@ -159,7 +168,7 @@ kimage_validate_signature(struct kimage *image) image->kernel_buf_len); if (ret) { - if (IS_ENABLED(CONFIG_KEXEC_SIG_FORCE)) { + if (sig_enforce) { pr_notice("Enforced kernel signature verification failed (%d).\n", ret); return ret; } diff --git a/security/integrity/ima/ima_efi.c b/security/integrity/ima/ima_efi.c index 71786d01946f..9db66fe310d4 100644 --- a/security/integrity/ima/ima_efi.c +++ b/security/integrity/ima/ima_efi.c @@ -67,6 +67,8 @@ const char * const *arch_get_ima_policy(void) if (IS_ENABLED(CONFIG_IMA_ARCH_POLICY) && arch_ima_get_secureboot()) { if (IS_ENABLED(CONFIG_MODULE_SIG)) set_module_sig_enforced(); + if (IS_ENABLED(CONFIG_KEXEC_SIG)) + set_kexec_sig_enforced(); return sb_arch_rules; } return NULL;
Currently, an unsigned kernel could be kexec'ed when IMA arch specific policy is configured unless lockdown is enabled. Enforce kernel signature verification check in the kexec_file_load syscall when IMA arch specific policy is configured. Fixes: 99d5cadfde2b ("kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE") Reported-by: Mimi Zohar <zohar@linux.ibm.com> Suggested-by: Mimi Zohar <zohar@linux.ibm.com> Signed-off-by: Coiby Xu <coxu@redhat.com> --- v2 - don't include linux/kexec.h since it's already been included in linux/ima.h - fix build errors when KEXEC_FILE/KEXEC_CORE is disable as caught by kernel test robot <lkp@intel.com> --- include/linux/kexec.h | 6 ++++++ kernel/kexec_file.c | 11 ++++++++++- security/integrity/ima/ima_efi.c | 2 ++ 3 files changed, 18 insertions(+), 1 deletion(-)