Commit 14251809 authored by Jeff Dike's avatar Jeff Dike Committed by Linus Torvalds

[PATCH] uml: host VDSO fix

This fixes a problem seen by a number of people running UML on newer host
kernels.  init would hang with an infinite segfault loop.

It turns out that the host kernel was providing a AT_SYSINFO_EHDR of
0xffffe000, which faked UML into believing that the host VDSO page could be
reused.  However, AT_SYSINFO pointed into the middle of the address space, and
was unmapped as a result.  Because UML was providing AT_SYSINFO_EHDR and
AT_SYSINFO to its own processes, these would branch to nowhere when trying to
use the VDSO.

The fix is to also check the location of AT_SYSINFO when deciding whether to
use the host's VDSO.
Signed-off-by: default avatarJeff Dike <>
Cc: Paolo 'Blaisorblade' Giarrusso <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent cf2775f1
......@@ -39,6 +39,9 @@ __init void scan_elf_aux( char **envp)
switch ( auxv->a_type ) {
__kernel_vsyscall = auxv->a_un.a_val;
/* See if the page is under TASK_SIZE */
if (__kernel_vsyscall < (unsigned long) envp)
__kernel_vsyscall = 0;
vsyscall_ehdr = auxv->a_un.a_val;
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