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Red Hat Bugzilla – Attachment 148397 Details for
Bug 229304
[patch] vdso is in user's way when exec-shield is off
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[patch]
put vdso at STACK_TOP when 0==exec_shield
linux-2.6-x86-vdso-stacktop-0.patch (text/plain), 888 bytes, created by
John Reiser
on 2007-02-20 03:48:32 UTC
(
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Description:
put vdso at STACK_TOP when 0==exec_shield
Filename:
MIME Type:
Creator:
John Reiser
Created:
2007-02-20 03:48:32 UTC
Size:
888 bytes
patch
obsolete
>--- ./arch/i386/kernel/sysenter.c.orig 2007-02-19 13:30:19.000000000 -0800 >+++ ./arch/i386/kernel/sysenter.c 2007-02-19 15:47:35.000000000 -0800 >@@ -23,6 +23,7 @@ > #include <asm/msr.h> > #include <asm/pgtable.h> > #include <asm/unistd.h> >+#include <asm/a.out.h> > > /* > * Should the kernel map a VDSO page into processes and pass its >@@ -106,11 +107,16 @@ > unsigned long start_code, unsigned long interp_map_address) > { > struct mm_struct *mm = current->mm; >- unsigned long addr; >+ unsigned long addr = 0ul; >+ unsigned long flags = 0ul; > int ret; > >+ if (0==exec_shield) { /* off */ >+ addr = STACK_TOP; /* avoid interfering with user */ >+ flags = MAP_FIXED; >+ } > down_write(&mm->mmap_sem); >- addr = get_unmapped_area_prot(NULL, 0, PAGE_SIZE, 0, 0, 1); >+ addr = get_unmapped_area_prot(NULL, addr, PAGE_SIZE, 0, flags, 1); > if (IS_ERR_VALUE(addr)) { > ret = addr; > goto up_fail;
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