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Date: Fri, 9 Feb 2007 21:31:45 -0500 (EST)
From: Parag Warudkar <parag.warudkar@...il.com>
To: akpm@...ux-foundation.org
cc: linux-kernel@...r.kernel.org, ak@...e.de, joerg@...rops.han.de,
dsd@...too.org, paulus@...ba.org, benh@...nel.crashing.org,
lethal@...ux-sh.org
Subject: [PATCH] Make aout executables work again
This a reworked, replacement version of
x86-fix-vdso-mapping-for-aout-executables-* series of patches in -mm.
1) Define arch_setup_additional_pages() as weak in linux/interp.h
2) Include linux/interp.h in appropriate places
3) Conditionally call arch_setup_additional_pages() from binfmt_*.c if the
arch defines it
4) EXPORT_SYMBOL_GPL(arch_setup_additional_pages) for all x86{64},
powerpc, sh - binfmt_aout can be built as module
5) Get rid of ARCH_HAS_SETUP_ADDITIONAL_PAGES from various places
6) For x86_64 - define and export arch_setup_additional_pages as a wrapper
over syscall32_setup_pages, call it from ia32_aout.c
Fully tested on x86. (Compile, boot and run the aout binary at
http://ftp.funet.fi/pub/Linux/bin/as86.tar.Z). Other arches - changes are
minimal but still I'll appreciate if someone tests them.
Signed-off-by: Parag Warudkar <parag.warudkar@...il.com>
diff -urN --exclude='*git*' --exclude='scripts*' linux-2.6-us/arch/i386/kernel/sysenter.c linux-2.6-wk/arch/i386/kernel/sysenter.c
--- linux-2.6-us/arch/i386/kernel/sysenter.c 2007-02-09 17:29:34.000000000 -0500
+++ linux-2.6-wk/arch/i386/kernel/sysenter.c 2007-02-09 17:54:48.000000000 -0500
@@ -137,6 +137,7 @@
up_write(&mm->mmap_sem);
return ret;
}
+EXPORT_SYMBOL_GPL(arch_setup_additional_pages);
const char *arch_vma_name(struct vm_area_struct *vma)
{
diff -urN --exclude='*git*' --exclude='scripts*' linux-2.6-us/arch/powerpc/kernel/vdso.c linux-2.6-wk/arch/powerpc/kernel/vdso.c
--- linux-2.6-us/arch/powerpc/kernel/vdso.c 2007-02-09 17:29:34.000000000 -0500
+++ linux-2.6-wk/arch/powerpc/kernel/vdso.c 2007-02-09 18:02:09.000000000 -0500
@@ -254,6 +254,7 @@
up_write(&mm->mmap_sem);
return rc;
}
+EXPORT_SYMBOL_GPL(arch_setup_additional_pages);
const char *arch_vma_name(struct vm_area_struct *vma)
{
diff -urN --exclude='*git*' --exclude='scripts*' linux-2.6-us/arch/sh/kernel/vsyscall/vsyscall.c linux-2.6-wk/arch/sh/kernel/vsyscall/vsyscall.c
--- linux-2.6-us/arch/sh/kernel/vsyscall/vsyscall.c 2007-02-09 17:29:34.000000000 -0500
+++ linux-2.6-wk/arch/sh/kernel/vsyscall/vsyscall.c 2007-02-09 18:02:51.000000000 -0500
@@ -85,6 +85,7 @@
up_write(&mm->mmap_sem);
return ret;
}
+EXPORT_SYMBOL_GPL(arch_setup_additional_pages);
const char *arch_vma_name(struct vm_area_struct *vma)
{
diff -urN --exclude='*git*' --exclude='scripts*' linux-2.6-us/arch/x86_64/ia32/ia32_aout.c linux-2.6-wk/arch/x86_64/ia32/ia32_aout.c
--- linux-2.6-us/arch/x86_64/ia32/ia32_aout.c 2007-01-26 18:49:37.000000000 -0500
+++ linux-2.6-wk/arch/x86_64/ia32/ia32_aout.c 2007-02-09 20:29:01.000000000 -0500
@@ -23,6 +23,7 @@
#include <linux/user.h>
#include <linux/slab.h>
#include <linux/binfmts.h>
+#include <linux/interp.h>
#include <linux/personality.h>
#include <linux/init.h>
@@ -410,6 +411,12 @@
send_sig(SIGKILL, current, 0);
return retval;
}
+
+ retval = arch_setup_additional_pages(bprm, EXSTACK_DEFAULT);
+ if (retval < 0) {
+ send_sig(SIGKILL, current, 0);
+ return retval;
+ }
current->mm->start_stack =
(unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
diff -urN --exclude='*git*' --exclude='scripts*' linux-2.6-us/arch/x86_64/ia32/ia32_binfmt.c linux-2.6-wk/arch/x86_64/ia32/ia32_binfmt.c
--- linux-2.6-us/arch/x86_64/ia32/ia32_binfmt.c 2007-01-27 17:23:08.000000000 -0500
+++ linux-2.6-wk/arch/x86_64/ia32/ia32_binfmt.c 2007-02-09 17:58:42.000000000 -0500
@@ -258,10 +258,6 @@
static void elf32_init(struct pt_regs *);
-#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
-#define arch_setup_additional_pages syscall32_setup_pages
-extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
-
#include "../../../fs/binfmt_elf.c"
static void elf32_init(struct pt_regs *regs)
diff -urN --exclude='*git*' --exclude='scripts*' linux-2.6-us/arch/x86_64/ia32/syscall32.c linux-2.6-wk/arch/x86_64/ia32/syscall32.c
--- linux-2.6-us/arch/x86_64/ia32/syscall32.c 2007-02-09 17:29:34.000000000 -0500
+++ linux-2.6-wk/arch/x86_64/ia32/syscall32.c 2007-02-09 18:01:23.000000000 -0500
@@ -48,6 +48,12 @@
return ret;
}
+int arch_setup_additional_pages(struct linux_binprm* bprm, int exstack)
+{
+ return syscall32_setup_pages(bprm, exstack);
+}
+EXPORT_SYMBOL_GPL(arch_setup_additional_pages);
+
const char *arch_vma_name(struct vm_area_struct *vma)
{
if (vma->vm_start == VSYSCALL32_BASE &&
diff -urN --exclude='*git*' --exclude='scripts*' linux-2.6-us/fs/binfmt_aout.c linux-2.6-wk/fs/binfmt_aout.c
--- linux-2.6-us/fs/binfmt_aout.c 2007-01-26 18:49:39.000000000 -0500
+++ linux-2.6-wk/fs/binfmt_aout.c 2007-02-09 17:53:33.000000000 -0500
@@ -22,6 +22,7 @@
#include <linux/user.h>
#include <linux/slab.h>
#include <linux/binfmts.h>
+#include <linux/interp.h>
#include <linux/personality.h>
#include <linux/init.h>
@@ -445,6 +446,14 @@
send_sig(SIGKILL, current, 0);
return retval;
}
+
+ if(arch_setup_additional_pages) {
+ retval = arch_setup_additional_pages(bprm, EXSTACK_DEFAULT);
+ if (retval < 0) {
+ send_sig(SIGKILL, current, 0);
+ return retval;
+ }
+ }
current->mm->start_stack =
(unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
diff -urN --exclude='*git*' --exclude='scripts*' linux-2.6-us/fs/binfmt_elf.c linux-2.6-wk/fs/binfmt_elf.c
--- linux-2.6-us/fs/binfmt_elf.c 2007-01-27 17:23:08.000000000 -0500
+++ linux-2.6-wk/fs/binfmt_elf.c 2007-02-09 17:48:18.000000000 -0500
@@ -20,6 +20,7 @@
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/binfmts.h>
+#include <linux/interp.h>
#include <linux/string.h>
#include <linux/file.h>
#include <linux/fcntl.h>
@@ -974,13 +975,13 @@
set_binfmt(&elf_format);
-#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
- retval = arch_setup_additional_pages(bprm, executable_stack);
- if (retval < 0) {
- send_sig(SIGKILL, current, 0);
- goto out;
+ if (arch_setup_additional_pages) {
+ retval = arch_setup_additional_pages(bprm, executable_stack);
+ if (retval < 0) {
+ send_sig(SIGKILL, current, 0);
+ goto out;
+ }
}
-#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
diff -urN --exclude='*git*' --exclude='scripts*' linux-2.6-us/include/linux/interp.h linux-2.6-wk/include/linux/interp.h
--- linux-2.6-us/include/linux/interp.h 1969-12-31 19:00:00.000000000 -0500
+++ linux-2.6-wk/include/linux/interp.h 2007-02-09 21:26:34.000000000 -0500
@@ -0,0 +1,8 @@
+#ifndef _LINUX_INTERP_H
+#define _LINUX_INTERP_H
+
+struct linux_binprm;
+
+extern int __attribute__((weak))
+ arch_setup_additional_pages(struct linux_binprm*, int);
+#endif /* _LINUX_INTERP_H */
-
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