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authorAl Viro <viro@zeniv.linux.org.uk>2008-04-28 04:15:49 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-28 06:28:37 -0400
commit8b67dca9420474623709e00d72a066068a502b20 (patch)
tree9d4dc19d849dd23cf00cee0851fd402062cdf1ea
parent4a761b8c1d7a3a4ee7ccf92ce255d986f601e067 (diff)
downloadop-kernel-dev-8b67dca9420474623709e00d72a066068a502b20.zip
op-kernel-dev-8b67dca9420474623709e00d72a066068a502b20.tar.gz
[PATCH] new predicate - AUDIT_FILETYPE
Argument is S_IF... | <index>, where index is normally 0 or 1. Triggers if chosen element of ctx->names[] is present and the mode of object in question matches the upper bits of argument. I.e. for things like "is the argument of that chmod a directory", etc. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--include/linux/audit.h1
-rw-r--r--kernel/auditfilter.c8
-rw-r--r--kernel/auditsc.c16
3 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h
index dcd5395..63c3bb9 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -209,6 +209,7 @@
#define AUDIT_WATCH 105
#define AUDIT_PERM 106
#define AUDIT_DIR 107
+#define AUDIT_FILETYPE 108
#define AUDIT_ARG0 200
#define AUDIT_ARG1 (AUDIT_ARG0+1)
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 7c3450d..9435d93 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -478,6 +478,10 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
if (f->val & ~15)
goto exit_free;
break;
+ case AUDIT_FILETYPE:
+ if ((f->val & ~S_IFMT) > S_IFMT)
+ goto exit_free;
+ break;
case AUDIT_INODE:
err = audit_to_inode(&entry->rule, f);
if (err)
@@ -649,6 +653,10 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
if (f->val & ~15)
goto exit_free;
break;
+ case AUDIT_FILETYPE:
+ if ((f->val & ~S_IFMT) > S_IFMT)
+ goto exit_free;
+ break;
default:
goto exit_free;
}
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 0914099..c10e7aa 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -280,6 +280,19 @@ static int audit_match_perm(struct audit_context *ctx, int mask)
}
}
+static int audit_match_filetype(struct audit_context *ctx, int which)
+{
+ unsigned index = which & ~S_IFMT;
+ mode_t mode = which & S_IFMT;
+ if (index >= ctx->name_count)
+ return 0;
+ if (ctx->names[index].ino == -1)
+ return 0;
+ if ((ctx->names[index].mode ^ mode) & S_IFMT)
+ return 0;
+ return 1;
+}
+
/*
* We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
* ->first_trees points to its beginning, ->trees - to the current end of data.
@@ -589,6 +602,9 @@ static int audit_filter_rules(struct task_struct *tsk,
case AUDIT_PERM:
result = audit_match_perm(ctx, f->val);
break;
+ case AUDIT_FILETYPE:
+ result = audit_match_filetype(ctx, f->val);
+ break;
}
if (!result)
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