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@@ -209,6 +209,54 @@ struct audit_context {
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#endif
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};
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+#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
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+static inline int open_arg(int flags, int mask)
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+{
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+ int n = ACC_MODE(flags);
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+ if (flags & (O_TRUNC | O_CREAT))
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+ n |= AUDIT_PERM_WRITE;
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+ return n & mask;
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+}
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+
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+static int audit_match_perm(struct audit_context *ctx, int mask)
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+{
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+ unsigned n = ctx->major;
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+ switch (audit_classify_syscall(ctx->arch, n)) {
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+ case 0: /* native */
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+ if ((mask & AUDIT_PERM_WRITE) &&
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+ audit_match_class(AUDIT_CLASS_WRITE, n))
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+ return 1;
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+ if ((mask & AUDIT_PERM_READ) &&
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+ audit_match_class(AUDIT_CLASS_READ, n))
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+ return 1;
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+ if ((mask & AUDIT_PERM_ATTR) &&
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+ audit_match_class(AUDIT_CLASS_CHATTR, n))
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+ return 1;
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+ return 0;
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+ case 1: /* 32bit on biarch */
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+ if ((mask & AUDIT_PERM_WRITE) &&
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+ audit_match_class(AUDIT_CLASS_WRITE_32, n))
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+ return 1;
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+ if ((mask & AUDIT_PERM_READ) &&
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+ audit_match_class(AUDIT_CLASS_READ_32, n))
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+ return 1;
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+ if ((mask & AUDIT_PERM_ATTR) &&
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+ audit_match_class(AUDIT_CLASS_CHATTR_32, n))
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+ return 1;
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+ return 0;
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+ case 2: /* open */
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+ return mask & ACC_MODE(ctx->argv[1]);
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+ case 3: /* openat */
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+ return mask & ACC_MODE(ctx->argv[2]);
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+ case 4: /* socketcall */
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+ return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
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+ case 5: /* execve */
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+ return mask & AUDIT_PERM_EXEC;
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+ default:
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+ return 0;
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+ }
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+}
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+
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/* Determine if any context name data matches a rule's watch data */
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/* Compare a task_struct with an audit_rule. Return 1 on match, 0
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* otherwise. */
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@@ -397,6 +445,9 @@ static int audit_filter_rules(struct task_struct *tsk,
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/* ignore this field for filtering */
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result = 1;
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break;
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+ case AUDIT_PERM:
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+ result = audit_match_perm(ctx, f->val);
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+ break;
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}
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if (!result)
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