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lockdown: Print current->comm in restriction messages

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Print the content of current->comm in messages generated by lockdown to
indicate a restriction that was hit.  This makes it a bit easier to find
out what caused the message.

The message now patterned something like:

        Lockdown: <comm>: <what> is restricted; see man kernel_lockdown.7

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Matthew Garrett <mjg59@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Matthew Garrett 2019-08-19 17:18:05 -07:00 committed by James Morris
parent 1957a85b00
commit b602614a81
2 changed files with 9 additions and 4 deletions
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5
fs/proc/kcore.c
View File

@ -548,11 +548,12 @@ static int open_kcore(struct inode *inode, struct file *filp)
{
int ret = security_locked_down(LOCKDOWN_KCORE);
if (ret)
return ret;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
if (ret)
return ret;
filp->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!filp->private_data)
return -ENOMEM;

8
security/lockdown/lockdown.c
View File

@ -81,10 +81,14 @@ early_param("lockdown", lockdown_param);
*/
static int lockdown_is_locked_down(enum lockdown_reason what)
{
if (WARN(what >= LOCKDOWN_CONFIDENTIALITY_MAX,
"Invalid lockdown reason"))
return -EPERM;
if (kernel_locked_down >= what) {
if (lockdown_reasons[what])
pr_notice("Lockdown: %s is restricted; see man kernel_lockdown.7\n",
lockdown_reasons[what]);
pr_notice("Lockdown: %s: %s is restricted; see man kernel_lockdown.7\n",
current->comm, lockdown_reasons[what]);
return -EPERM;
}