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ARM: Fix ptrace accesses

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Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2009-11-05 13:29:36 +00:00
parent bf32eb8549
commit 2ef7f3dbd7
3 changed files with 50 additions and 30 deletions
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51
arch/arm/mm/flush.c
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@@ -13,6 +13,7 @@
#include <asm/cacheflush.h>
#include <asm/cachetype.h>
#include <asm/smp_plat.h>
#include <asm/system.h>
#include <asm/tlbflush.h>
@@ -87,13 +88,26 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsig
if (vma->vm_flags & VM_EXEC && icache_is_vivt_asid_tagged())
__flush_icache_all();
}
#else
#define flush_pfn_alias(pfn,vaddr) do { } while (0)
#endif
#ifdef CONFIG_SMP
static void flush_ptrace_access_other(void *args)
{
__flush_icache_all();
}
#endif
static
void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
unsigned long uaddr, void *kaddr,
unsigned long len, int write)
unsigned long uaddr, void *kaddr, unsigned long len)
{
if (cache_is_vivt()) {
vivt_flush_ptrace_access(vma, page, uaddr, kaddr, len, write);
if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) {
unsigned long addr = (unsigned long)kaddr;
__cpuc_coherent_kern_range(addr, addr + len);
}
return;
}
@@ -104,16 +118,37 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
}
/* VIPT non-aliasing cache */
if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm)) &&
vma->vm_flags & VM_EXEC) {
if (vma->vm_flags & VM_EXEC) {
unsigned long addr = (unsigned long)kaddr;
/* only flushing the kernel mapping on non-aliasing VIPT */
__cpuc_coherent_kern_range(addr, addr + len);
#ifdef CONFIG_SMP
if (cache_ops_need_broadcast())
smp_call_function(flush_ptrace_access_other,
NULL, 1);
#endif
}
}
#else
#define flush_pfn_alias(pfn,vaddr) do { } while (0)
/*
* Copy user data from/to a page which is mapped into a different
* processes address space. Really, we want to allow our "user
* space" model to handle this.
*
* Note that this code needs to run on the current CPU.
*/
void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long uaddr, void *dst, const void *src,
unsigned long len)
{
#ifdef CONFIG_SMP
preempt_disable();
#endif
memcpy(dst, src, len);
flush_ptrace_access(vma, page, uaddr, dst, len);
#ifdef CONFIG_SMP
preempt_enable();
#endif
}
void __flush_dcache_page(struct address_space *mapping, struct page *page)
{