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

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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>
This commit is contained in:
Chen Gang 2015-12-30 09:10:54 +08:00 committed by Riku Voipio
parent 2a0fa68fb9
commit e6deac9cf9
1 changed files with 3 additions and 1 deletions
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linux-user/mmap.c
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@ -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;
}