Commit e6deac9c authored Dec 30, 2015 by Chen Gang Committed by Riku Voipio Jan 08, 2016

linux-user/mmap.c: Always zero MAP_ANONYMOUS memory in mmap_frag()



When mapping MAP_ANONYMOUS memory fragments, still need notice about to
set it zero, or it will cause issues.

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>

parent 2a0fa68f

linux-user/mmap.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -186,10 +186,12 @@ static int mmap_frag(abi_ulong real_start,
		if (prot_new != (prot1 \| PROT_WRITE))
		mprotect(host_start, qemu_host_page_size, prot_new);
		} else {
		/* just update the protection */
		if (prot_new != prot1) {
		mprotect(host_start, qemu_host_page_size, prot_new);
		}
		if (prot_new & PROT_WRITE) {
		memset(g2h(start), 0, end - start);
		}
		}
		return 0;
		}