| Message ID | 1501075375-29469-5-git-send-email-zohar@linux.vnet.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Looks good to me. On Wed, Jul 26, 2017 at 4:22 PM, Mimi Zohar <zohar@linux.vnet.ibm.com> wrote: > Permit normally denied access/execute permission for files in policy > on IMA unsupported filesystems. This patch defines "fs_unsafe", a > builtin policy. > > Mimi Zohar <zohar@linux.vnet.ibm.com> > > --- > Changelog v3: > - include dont_failsafe rule when displaying policy > > Documentation/admin-guide/kernel-parameters.txt | 8 +++++++- > security/integrity/ima/ima_policy.c | 12 ++++++++++++ > 2 files changed, 19 insertions(+), 1 deletion(-) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index d9c171ce4190..4e303be83df6 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -1502,7 +1502,7 @@ > > ima_policy= [IMA] > The builtin policies to load during IMA setup. > - Format: "tcb | appraise_tcb | secure_boot" > + Format: "tcb | appraise_tcb | secure_boot | fs_unsafe" > > The "tcb" policy measures all programs exec'd, files > mmap'd for exec, and all files opened with the read > @@ -1517,6 +1517,12 @@ > of files (eg. kexec kernel image, kernel modules, > firmware, policy, etc) based on file signatures. > > + The "fs_unsafe" policy permits normally denied > + access/execute permission for files in policy on IMA > + unsupported filesystems. Note this option, as the > + name implies, is not safe and not recommended for > + any environments other than testing. > + > ima_tcb [IMA] Deprecated. Use ima_policy= instead. > Load a policy which meets the needs of the Trusted > Computing Base. This means IMA will measure all > diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c > index 43b85a4fb8e8..cddd9dfb01e1 100644 > --- a/security/integrity/ima/ima_policy.c > +++ b/security/integrity/ima/ima_policy.c > @@ -169,6 +169,10 @@ static struct ima_rule_entry secure_boot_rules[] __ro_after_init = { > .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED}, > }; > > +static struct ima_rule_entry dont_failsafe_rules[] __ro_after_init = { > + {.action = DONT_FAILSAFE} > +}; > + > static LIST_HEAD(ima_default_rules); > static LIST_HEAD(ima_policy_rules); > static LIST_HEAD(ima_temp_rules); > @@ -188,6 +192,7 @@ __setup("ima_tcb", default_measure_policy_setup); > > static bool ima_use_appraise_tcb __initdata; > static bool ima_use_secure_boot __initdata; > +static bool ima_use_dont_failsafe __initdata; > static int __init policy_setup(char *str) > { > char *p; > @@ -201,6 +206,10 @@ static int __init policy_setup(char *str) > ima_use_appraise_tcb = 1; > else if (strcmp(p, "secure_boot") == 0) > ima_use_secure_boot = 1; > + else if (strcmp(p, "fs_unsafe") == 0) { > + ima_use_dont_failsafe = 1; > + set_failsafe(0); > + } > } > > return 1; > @@ -470,6 +479,9 @@ void __init ima_init_policy(void) > temp_ima_appraise |= IMA_APPRAISE_POLICY; > } > > + if (ima_use_dont_failsafe) > + list_add_tail(&dont_failsafe_rules[0].list, &ima_default_rules); > + > ima_rules = &ima_default_rules; > ima_update_policy_flag(); > } > -- > 2.7.4 > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Linux-ima-devel mailing list > Linux-ima-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linux-ima-devel
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index d9c171ce4190..4e303be83df6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1502,7 +1502,7 @@ ima_policy= [IMA] The builtin policies to load during IMA setup. - Format: "tcb | appraise_tcb | secure_boot" + Format: "tcb | appraise_tcb | secure_boot | fs_unsafe" The "tcb" policy measures all programs exec'd, files mmap'd for exec, and all files opened with the read @@ -1517,6 +1517,12 @@ of files (eg. kexec kernel image, kernel modules, firmware, policy, etc) based on file signatures. + The "fs_unsafe" policy permits normally denied + access/execute permission for files in policy on IMA + unsupported filesystems. Note this option, as the + name implies, is not safe and not recommended for + any environments other than testing. + ima_tcb [IMA] Deprecated. Use ima_policy= instead. Load a policy which meets the needs of the Trusted Computing Base. This means IMA will measure all diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 43b85a4fb8e8..cddd9dfb01e1 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -169,6 +169,10 @@ static struct ima_rule_entry secure_boot_rules[] __ro_after_init = { .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED}, }; +static struct ima_rule_entry dont_failsafe_rules[] __ro_after_init = { + {.action = DONT_FAILSAFE} +}; + static LIST_HEAD(ima_default_rules); static LIST_HEAD(ima_policy_rules); static LIST_HEAD(ima_temp_rules); @@ -188,6 +192,7 @@ __setup("ima_tcb", default_measure_policy_setup); static bool ima_use_appraise_tcb __initdata; static bool ima_use_secure_boot __initdata; +static bool ima_use_dont_failsafe __initdata; static int __init policy_setup(char *str) { char *p; @@ -201,6 +206,10 @@ static int __init policy_setup(char *str) ima_use_appraise_tcb = 1; else if (strcmp(p, "secure_boot") == 0) ima_use_secure_boot = 1; + else if (strcmp(p, "fs_unsafe") == 0) { + ima_use_dont_failsafe = 1; + set_failsafe(0); + } } return 1; @@ -470,6 +479,9 @@ void __init ima_init_policy(void) temp_ima_appraise |= IMA_APPRAISE_POLICY; } + if (ima_use_dont_failsafe) + list_add_tail(&dont_failsafe_rules[0].list, &ima_default_rules); + ima_rules = &ima_default_rules; ima_update_policy_flag(); }