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ARM: 7294/1: vectors: use gate_vma for vectors user mapping

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The current user mapping for the vectors page is inserted as a `horrible
hack vma' into each task via arch_setup_additional_pages. This causes
problems with the MM subsystem and vm_normal_page, as described here:

https://lkml.org/lkml/2012/1/14/55

Following the suggestion from Hugh in the above thread, this patch uses
the gate_vma for the vectors user mapping, therefore consolidating
the horrible hack VMAs into one.

Acked-and-Tested-by: Nicolas Pitre <nico@linaro.org>

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2012-01-20 12:01:13 +01:00 • committed by Russell King
parent 195864cf3d
commit f9d4861fc3
4 changed files with 31 additions and 42 deletions
Download patch file Download diff file Expand all files Collapse all files

38
arch/arm/kernel/process.c
View file

@ -526,22 +526,40 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
#ifdef CONFIG_MMU
/*
* The vectors page is always readable from user space for the
* atomic helpers and the signal restart code. Let's declare a mapping
* for it so it is visible through ptrace and /proc/<pid>/mem.
* atomic helpers and the signal restart code. Insert it into the
* gate_vma so that it is visible through ptrace and /proc/<pid>/mem.
*/
static struct vm_area_struct gate_vma;
int vectors_user_mapping(void)
static int __init gate_vma_init(void)
{
struct mm_struct *mm = current->mm;
return install_special_mapping(mm, 0xffff0000, PAGE_SIZE,
VM_READ | VM_EXEC |
VM_MAYREAD | VM_MAYEXEC |
VM_ALWAYSDUMP | VM_RESERVED,
NULL);
gate_vma.vm_start = 0xffff0000;
gate_vma.vm_end = 0xffff0000 + PAGE_SIZE;
gate_vma.vm_page_prot = PAGE_READONLY_EXEC;
gate_vma.vm_flags = VM_READ | VM_EXEC |
VM_MAYREAD | VM_MAYEXEC |
VM_ALWAYSDUMP;
return 0;
}
arch_initcall(gate_vma_init);
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
return &gate_vma;
}
int in_gate_area(struct mm_struct *mm, unsigned long addr)
{
return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end);
}
int in_gate_area_no_mm(unsigned long addr)
{
return in_gate_area(NULL, addr);
}
const char *arch_vma_name(struct vm_area_struct *vma)
{
return (vma->vm_start == 0xffff0000) ? "[vectors]" : NULL;
return (vma == &gate_vma) ? "[vectors]" : NULL;
}
#endif