X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fldso%2Fdynlink.c;h=105ed3d71de4577536fb934a8385789a07955bc5;hp=8ade0737f4af23301610cea363f44c524f4e50fa;hb=e8dbf00a789e3b56ca6c3d88e8048b7b2c18b797;hpb=596d60c5650488069ac1bbabb786685ebd3298c1

diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 8ade0737..105ed3d7 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -48,6 +48,7 @@ struct dso
 };
 
 static struct dso *head, *tail, *libc;
+static int trust_env;
 
 #define AUX_CNT 15
 #define DYN_CNT 34
@@ -317,6 +318,17 @@ static void reloc_all(struct dso *p)
 			2, p->syms, p->strings, p);
 		do_relocs(p->base, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ],
 			3, p->syms, p->strings, p);
+		p->relocated = 1;
+	}
+}
+
+static void free_all(struct dso *p)
+{
+	struct dso *n;
+	while (p) {
+		n = p->next;
+		if (p->map) free(p);
+		p = n;
 	}
 }
 
@@ -373,6 +385,11 @@ void *__dynlink(int argc, char **argv, size_t *got)
 
 	/* At this point the standard library is fully functional */
 
+	/* Only trust user/env if kernel says we're not suid/sgid */
+	trust_env = (aux[0]&0x7800)==0x7800
+		&& aux[AT_UID]==aux[AT_EUID]
+		&& aux[AT_GID]==aux[AT_EGID];
+
 	head = tail = &app;
 	libc = &lib;
 	app.next = 0;
@@ -380,6 +397,8 @@ void *__dynlink(int argc, char **argv, size_t *got)
 
 	reloc_all(head);
 
+	free_all(head);
+
 	errno = 0;
 	return (void *)aux[AT_ENTRY];
 }