From 8b67dca9420474623709e00d72a066068a502b20 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 28 Apr 2008 04:15:49 -0400 Subject: [PATCH] new predicate - AUDIT_FILETYPE Argument is S_IF... | , 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 --- kernel/auditfilter.c | 8 ++++++++ kernel/auditsc.c | 16 ++++++++++++++++ 2 files changed, 24 insertions(+) (limited to 'kernel') diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index 7c3450d063fe..9435d9392df5 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 091409996577..c10e7aae04d7 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) -- cgit v1.2.3-59-g8ed1b