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ima: Allow template selection with ima_template[_fmt]= after ima_hash= 

Commit c2426d2ad5 ("ima: added support for new kernel cmdline parameter
ima_template_fmt") introduced an additional check on the ima_template
variable to avoid multiple template selection.

Unfortunately, ima_template could be also set by the setup function of the
ima_hash= parameter, when it calls ima_template_desc_current(). This causes
attempts to choose a new template with ima_template= or with
ima_template_fmt=, after ima_hash=, to be ignored.

Achieve the goal of the commit mentioned with the new static variable
template_setup_done, so that template selection requests after ima_hash=
are not ignored.

Finally, call ima_init_template_list(), if not already done, to initialize
the list of templates before lookup_template_desc() is called.

Reported-by: Guo Zihua <guozihua@huawei.com>
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Cc: stable@vger.kernel.org
Fixes: c2426d2ad5 ("ima: added support for new kernel cmdline parameter ima_template_fmt")
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Roberto Sassu 2022-01-31 18:11:39 +01:00 committed by Mimi Zohar
parent f7333b9572
commit bb8e52e490
1 changed files with 7 additions and 3 deletions
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10
security/integrity/ima/ima_template.c
View File

@ -29,6 +29,7 @@ static struct ima_template_desc builtin_templates[] = {
static LIST_HEAD(defined_templates);
static DEFINE_SPINLOCK(template_list);
static int template_setup_done;
static const struct ima_template_field supported_fields[] = {
{.field_id = "d", .field_init = ima_eventdigest_init,
@ -101,10 +102,11 @@ static int __init ima_template_setup(char *str)
struct ima_template_desc *template_desc;
int template_len = strlen(str);
if (ima_template)
if (template_setup_done)
return 1;
ima_init_template_list();
if (!ima_template)
ima_init_template_list();
/*
* Verify that a template with the supplied name exists.
@ -128,6 +130,7 @@ static int __init ima_template_setup(char *str)
}
ima_template = template_desc;
template_setup_done = 1;
return 1;
}
__setup("ima_template=", ima_template_setup);
@ -136,7 +139,7 @@ static int __init ima_template_fmt_setup(char *str)
{
int num_templates = ARRAY_SIZE(builtin_templates);
if (ima_template)
if (template_setup_done)
return 1;
if (template_desc_init_fields(str, NULL, NULL) < 0) {
@ -147,6 +150,7 @@ static int __init ima_template_fmt_setup(char *str)
builtin_templates[num_templates - 1].fmt = str;
ima_template = builtin_templates + num_templates - 1;
template_setup_done = 1;
return 1;
}