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

Similar to the equivalent linux-user commit e6deac9cf9

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

Signed-off-by: Mikaël Urankar <mikael.urankar@gmail.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
This commit is contained in:
Mikaël Urankar 2017-07-08 13:13:31 +02:00 committed by Warner Losh
parent c148a05721
commit 948516a3fa
1 changed files with 3 additions and 1 deletions
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4
bsd-user/mmap.c
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@ -180,10 +180,12 @@ 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_untagged(start), 0, end - start);
}
}
return 0;
}