x86/vdso: Error out if the vDSO isn't a valid DSO

[cascardo/linux.git] / arch / x86 / entry / vdso / vdso2c.h

diff --git a/arch/x86/entry/vdso/vdso2c.h b/arch/x86/entry/vdso/vdso2c.h
index 63a03bb..4f74119 100644 (file)
--- a/arch/x86/entry/vdso/vdso2c.h
+++ b/arch/x86/entry/vdso/vdso2c.h
@@ -22,6 +22,9 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len,
 
        ELF(Phdr) *pt = (ELF(Phdr) *)(raw_addr + GET_LE(&hdr->e_phoff));
 
+       if (hdr->e_type != ET_DYN)
+               fail("input is not a shared object\n");
+
        /* Walk the segment table. */
        for (i = 0; i < GET_LE(&hdr->e_phnum); i++) {
                if (GET_LE(&pt[i].p_type) == PT_LOAD) {
@@ -49,6 +52,9 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len,
        if (stripped_len < load_size)
                fail("stripped input is too short\n");
 
+       if (!dyn)
+               fail("input has no PT_DYNAMIC section -- your toolchain is buggy\n");
+
        /* Walk the dynamic table */
        for (i = 0; dyn + i < dyn_end &&
                     GET_LE(&dyn[i].d_tag) != DT_NULL; i++) {