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treat null vdso base same as missing

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On s390x, the kernel provides AT_SYSINFO_EHDR, but sets it to zero, if the
program being run does not have a program interpreter.  This causes
problems when running the dynamic linker directly.
This commit is contained in:
Bobby Bingham
2016-11-11 12:58:27 -05:00
committed by Rich Felker
parent b418ea1b66
commit 54482898ab
2 changed files with 2 additions and 1 deletions
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ldso/dynlink.c
+1 -1
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@@ -1550,7 +1550,7 @@ _Noreturn void __dls3(size_t *sp)
}
/* Attach to vdso, if provided by the kernel */
if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR) && vdso_base) {
Ehdr *ehdr = (void *)vdso_base;
Phdr *phdr = vdso.phdr = (void *)(vdso_base + ehdr->e_phoff);
vdso.phnum = ehdr->e_phnum;