Commit 551ed332 authored Feb 06, 2008 by Scott Wood Committed by Paul Mackerras Feb 06, 2008

[POWERPC] update_mmu_cache: Don't cache-flush non-readable pages



Currently, update_mmu_cache will crash if given a no-access PTE.
There's no need to synchronize dcache/icache unless it's an exec
mapping -- however, due to the existence of older glibc versions that
execute out of a read-but-no-exec page, readability is tested instead.

This assumes no exec-only mappings; if such mappings become supported,
they will need to go through the kmap_atomic() version of
dcache/icache synchronization.

This fixes a bug reported by some users where the kernel would crash
while dumping core on a threaded program.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

parent f5903ede

arch/powerpc/mm/mem.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -483,7 +483,12 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
		*/
		_tlbie(address, 0 /* 8xx doesn't care about PID */);
		#endif
		if (!PageReserved(page)
		/* The _PAGE_USER test should really be _PAGE_EXEC, but
		* older glibc versions execute some code from no-exec
		* pages, which for now we are supporting. If exec-only
		* pages are ever implemented, this will have to change.
		*/
		if (!PageReserved(page) && (pte_val(pte) & _PAGE_USER)
		&& !test_bit(PG_arch_1, &page->flags)) {
		if (vma->vm_mm == current->active_mm) {
		__flush_dcache_icache((void *) address);