Message ID | 20211008212344.95537-2-imp@bsdimp.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
Series | bsd-user mmap fixes | expand |
On Fri, Oct 8, 2021 at 4:24 PM Warner Losh <imp@bsdimp.com> wrote: > > From: Mikaël Urankar <mikael.urankar@gmail.com> > > Similar to the equivalent linux-user commit e6deac9cf99 > > 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> > --- > bsd-user/mmap.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c > index b40ab9045f..fc3c1480f5 100644 > --- a/bsd-user/mmap.c > +++ b/bsd-user/mmap.c > @@ -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; > } > -- > 2.32.0 > Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c index b40ab9045f..fc3c1480f5 100644 --- a/bsd-user/mmap.c +++ b/bsd-user/mmap.c @@ -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; }