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[PATCH] new predicate - AUDIT_FILETYPE

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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>
This commit is contained in:
Al Viro 2008-04-28 04:15:49 -04:00
parent 4a761b8c1d
commit 8b67dca942
3 changed files with 25 additions and 0 deletions
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1
include/linux/audit.h
View file

@ -209,6 +209,7 @@
#define AUDIT_WATCH 105 #define AUDIT_WATCH 105
#define AUDIT_PERM 106 #define AUDIT_PERM 106
#define AUDIT_DIR 107 #define AUDIT_DIR 107
#define AUDIT_FILETYPE 108
#define AUDIT_ARG0 200 #define AUDIT_ARG0 200
#define AUDIT_ARG1 (AUDIT_ARG0+1) #define AUDIT_ARG1 (AUDIT_ARG0+1)

8
kernel/auditfilter.c
View file

@ -478,6 +478,10 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
if (f->val & ~15) if (f->val & ~15)
goto exit_free; goto exit_free;
break; break;
case AUDIT_FILETYPE:
if ((f->val & ~S_IFMT) > S_IFMT)
goto exit_free;
break;
case AUDIT_INODE: case AUDIT_INODE:
err = audit_to_inode(&entry->rule, f); err = audit_to_inode(&entry->rule, f);
if (err) if (err)
@ -649,6 +653,10 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
if (f->val & ~15) if (f->val & ~15)
goto exit_free; goto exit_free;
break; break;
case AUDIT_FILETYPE:
if ((f->val & ~S_IFMT) > S_IFMT)
goto exit_free;
break;
default: default:
goto exit_free; goto exit_free;
} }

16
kernel/auditsc.c
View file

@ -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 *; * 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. * ->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: case AUDIT_PERM:
result = audit_match_perm(ctx, f->val); result = audit_match_perm(ctx, f->val);
break; break;
case AUDIT_FILETYPE:
result = audit_match_filetype(ctx, f->val);
break;
} }
if (!result) if (!result)