mirror of
https://github.com/brain-hackers/linux-brain.git
synced 2024-06-09 15:26:21 +09:00
2ee7d6f173
commit 93312b6da4 upstream.
mprotect(EXEC) was failing for stack mappings as default vm flags was
missing MAYEXEC.
This was triggered by glibc test suite nptl/tst-execstack testcase
What is surprising is that despite running LTP for years on, we didn't
catch this issue as it lacks a directed test case.
gcc dejagnu tests with nested functions also requiring exec stack work
fine though because they rely on the GNU_STACK segment spit out by
compiler and handled in kernel elf loader.
This glibc case is different as the stack is non exec to begin with and
a dlopen of shared lib with GNU_STACK segment triggers the exec stack
proceedings using a mprotect(PROT_EXEC) which was broken.
CC: stable@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/*
|
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef __ASM_ARC_PAGE_H
|
|
#define __ASM_ARC_PAGE_H
|
|
|
|
#include <uapi/asm/page.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
|
|
#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
|
|
|
|
struct vm_area_struct;
|
|
struct page;
|
|
|
|
#define __HAVE_ARCH_COPY_USER_HIGHPAGE
|
|
|
|
void copy_user_highpage(struct page *to, struct page *from,
|
|
unsigned long u_vaddr, struct vm_area_struct *vma);
|
|
void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
|
|
|
|
#undef STRICT_MM_TYPECHECKS
|
|
|
|
#ifdef STRICT_MM_TYPECHECKS
|
|
/*
|
|
* These are used to make use of C type-checking..
|
|
*/
|
|
typedef struct {
|
|
#ifdef CONFIG_ARC_HAS_PAE40
|
|
unsigned long long pte;
|
|
#else
|
|
unsigned long pte;
|
|
#endif
|
|
} pte_t;
|
|
typedef struct {
|
|
unsigned long pgd;
|
|
} pgd_t;
|
|
typedef struct {
|
|
unsigned long pgprot;
|
|
} pgprot_t;
|
|
|
|
#define pte_val(x) ((x).pte)
|
|
#define pgd_val(x) ((x).pgd)
|
|
#define pgprot_val(x) ((x).pgprot)
|
|
|
|
#define __pte(x) ((pte_t) { (x) })
|
|
#define __pgd(x) ((pgd_t) { (x) })
|
|
#define __pgprot(x) ((pgprot_t) { (x) })
|
|
|
|
#define pte_pgprot(x) __pgprot(pte_val(x))
|
|
|
|
#else /* !STRICT_MM_TYPECHECKS */
|
|
|
|
#ifdef CONFIG_ARC_HAS_PAE40
|
|
typedef unsigned long long pte_t;
|
|
#else
|
|
typedef unsigned long pte_t;
|
|
#endif
|
|
typedef unsigned long pgd_t;
|
|
typedef unsigned long pgprot_t;
|
|
|
|
#define pte_val(x) (x)
|
|
#define pgd_val(x) (x)
|
|
#define pgprot_val(x) (x)
|
|
#define __pte(x) (x)
|
|
#define __pgd(x) (x)
|
|
#define __pgprot(x) (x)
|
|
#define pte_pgprot(x) (x)
|
|
|
|
#endif
|
|
|
|
typedef pte_t * pgtable_t;
|
|
|
|
/*
|
|
* Use virt_to_pfn with caution:
|
|
* If used in pte or paddr related macros, it could cause truncation
|
|
* in PAE40 builds
|
|
* As a rule of thumb, only use it in helpers starting with virt_
|
|
* You have been warned !
|
|
*/
|
|
#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
|
|
|
|
#define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_LINK_BASE)
|
|
|
|
#ifdef CONFIG_FLATMEM
|
|
#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
|
|
#endif
|
|
|
|
/*
|
|
* __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
|
|
*
|
|
* These macros have historically been misnamed
|
|
* virt here means link-address/program-address as embedded in object code.
|
|
* And for ARC, link-addr = physical address
|
|
*/
|
|
#define __pa(vaddr) ((unsigned long)(vaddr))
|
|
#define __va(paddr) ((void *)((unsigned long)(paddr)))
|
|
|
|
#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
|
|
#define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
|
|
|
|
/* Default Permissions for stack/heaps pages (Non Executable) */
|
|
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
|
|
|
|
#define WANT_PAGE_VIRTUAL 1
|
|
|
|
#include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
|
|
#include <asm-generic/getorder.h>
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif
|