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audit: allow other filter list types for AUDIT_EXE

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This patch removes the restriction of the AUDIT_EXE field to only
SYSCALL filter and teaches audit_filter to recognize this field.

This makes it possible to write rule lists such as:

    auditctl -a exit,always [some general rule]
    # Filter out events with executable name /bin/exe1 or /bin/exe2:
    auditctl -a exclude,always -F exe=/bin/exe1
    auditctl -a exclude,always -F exe=/bin/exe2

See: https://github.com/linux-audit/audit-kernel/issues/54

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Ondrej Mosnáček
2018-05-30 10:45:24 +02:00
committed by Paul Moore
parent ce397d215c
commit 29c1372d6a
1 changed files with 5 additions and 2 deletions
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7
kernel/auditfilter.c
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@@ -428,8 +428,6 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
case AUDIT_EXE: case AUDIT_EXE:
if (f->op != Audit_not_equal && f->op != Audit_equal) if (f->op != Audit_not_equal && f->op != Audit_equal)
return -EINVAL; return -EINVAL;
if (entry->rule.listnr != AUDIT_FILTER_EXIT)
return -EINVAL;
break; break;
} }
return 0; return 0;
@@ -1360,6 +1358,11 @@ int audit_filter(int msgtype, unsigned int listtype)
f->type, f->op, f->lsm_rule, NULL); f->type, f->op, f->lsm_rule, NULL);
} }
break; break;
case AUDIT_EXE:
result = audit_exe_compare(current, e->rule.exe);
if (f->op == Audit_not_equal)
result = !result;
break;
default: default:
goto unlock_and_return; goto unlock_and_return;
} }