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authorChen Gang <chengang@emindsoft.com.cn>2015-12-30 09:10:54 +0800
committerRiku Voipio <riku.voipio@linaro.org>2016-01-08 15:26:16 +0200
commite6deac9cf99e013a3e253aff2332836c86d8a52c (patch)
treebc9c3aaab010889853d283ab9862c46e767a55fa /linux-user/mmap.c
parent2a0fa68fb9761e2eb3dae4034131948d33018dc9 (diff)
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>
Diffstat (limited to 'linux-user/mmap.c')
-rw-r--r--linux-user/mmap.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 7b459d5100..c6c478e552 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -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;
}