From a502a3593c7aa2aff99a61ed71e7cb828ee4da8b Mon Sep 17 00:00:00 2001 From: Jeff Dike <jdike@addtoit.com> Date: Fri, 29 Jul 2005 14:03:33 -0700 Subject: [PATCH] [PATCH] uml: fix vsyscall brokenness The #if/#ifdef cleanup exposed a bug in UML's ELF header processing. With this bug fixed, UML recognizes the vsyscall info coming from the host. On FC4, there is a vsyscall page low in the address space, which UML doesn't provide. This causes an infinite page fault loop and a hang on boot. This patch works around that by making this look like a no-vsyscall system. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> --- arch/um/os-Linux/elf_aux.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/um/os-Linux/elf_aux.c b/arch/um/os-Linux/elf_aux.c index 5423b1ca17c47..9416e1c299269 100644 --- a/arch/um/os-Linux/elf_aux.c +++ b/arch/um/os-Linux/elf_aux.c @@ -9,9 +9,10 @@ */ #include <elf.h> #include <stddef.h> +#include <asm/elf.h> #include "init.h" #include "elf_user.h" -#include <asm/elf.h> +#include "mem_user.h" #if ELF_CLASS == ELFCLASS32 typedef Elf32_auxv_t elf_auxv_t; @@ -41,6 +42,9 @@ __init void scan_elf_aux( char **envp) break; case AT_SYSINFO_EHDR: vsyscall_ehdr = auxv->a_un.a_val; + /* See if the page is under TASK_SIZE */ + if (vsyscall_ehdr < (unsigned long) envp) + vsyscall_ehdr = 0; break; case AT_HWCAP: elf_aux_hwcap = auxv->a_un.a_val; -- GitLab