From d7a0380dc3e6607d30ccdfc3cfc2ccee0d966716 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Wed, 16 Jun 2010 22:30:42 +0200 Subject: x86-64, mm: Initialize VDSO earlier on 64 bits When initrd is in use and a driver does request_module() in its module_init (i.e. __initcall or device_initcall), a modprobe process is created with VDSO mapping. But VDSO is inited even in __initcall, i.e. on the same level (at the same time), so it may not be inited yet (link order matters). Move the VDSO initialization code earlier by switching to something before rootfs_initcall where initrd is loaded as rootfs. Specifically to subsys_initcall. Do it for standard 64-bit path (init_vdso_vars) and for compat (sysenter_setup), just in case people have 32-bit initrd and ia32 emulation built-in. i386 (pure 32-bit) is not affected, since sysenter_setup() is called from check_bugs()->identify_boot_cpu() in start_kernel() before rest_init()->kernel_thread(kernel_init) where even kernel_init() calls do_basic_setup()->do_initcalls(). What this patch fixes are early modprobe crashes such as: Unpacking initramfs... Freeing initrd memory: 9324k freed modprobe[368]: segfault at 7fff4429c020 ip 00007fef397e160c \ sp 00007fff442795c0 error 4 in ld-2.11.2.so[7fef397df000+1f000] Signed-off-by: Jiri Slaby LKML-Reference: <1276720242-13365-1-git-send-email-jslaby@suse.cz> Signed-off-by: H. Peter Anvin --- arch/x86/vdso/vma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/vdso/vma.c') diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c index ac74869b8140..43456ee17692 100644 --- a/arch/x86/vdso/vma.c +++ b/arch/x86/vdso/vma.c @@ -74,7 +74,7 @@ static int __init init_vdso_vars(void) vdso_enabled = 0; return -ENOMEM; } -__initcall(init_vdso_vars); +subsys_initcall(init_vdso_vars); struct linux_binprm; -- cgit v1.2.3 From be783a47214afc5a0aea9dafcbd9f1535ba05e94 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Mon, 2 Aug 2010 08:49:34 +0800 Subject: x86, vdso: Unmap vdso pages We mapped vdso pages but never unmapped them and the virtual address is lost after exiting from the function, so unmap vdso pages here. Signed-off-by: Shaohua Li LKML-Reference: <20100802004934.GA2505@sli10-desk.sh.intel.com> Signed-off-by: H. Peter Anvin --- arch/x86/vdso/vma.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/x86/vdso/vma.c') diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c index ac74869b8140..80f23ed483ef 100644 --- a/arch/x86/vdso/vma.c +++ b/arch/x86/vdso/vma.c @@ -67,6 +67,7 @@ static int __init init_vdso_vars(void) *(typeof(__ ## x) **) var_ref(VDSO64_SYMBOL(vbase, x), #x) = &__ ## x; #include "vextern.h" #undef VEXTERN + vunmap(vbase); return 0; oom: -- cgit v1.2.3