From: Warner Losh <imp@bsdimp.com>
To: qemu-devel@nongnu.org
Cc: kevans@freebsd.org, "Mikaël Urankar" <mikael.urankar@gmail.com>,
richard.henderson@linaro.org, f4bug@amsat.org,
"Warner Losh" <imp@bsdimp.com>
Subject: [PATCH v3 1/9] bsd-user/mmap.c: Always zero MAP_ANONYMOUS memory in mmap_frag()
Date: Fri, 8 Oct 2021 15:23:36 -0600 [thread overview]
Message-ID: <20211008212344.95537-2-imp@bsdimp.com> (raw)
In-Reply-To: <20211008212344.95537-1-imp@bsdimp.com>
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
next prev parent reply other threads:[~2021-10-08 21:26 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-08 21:23 [PATCH v3 0/9] bsd-user mmap fixes Warner Losh
2021-10-08 21:23 ` Warner Losh [this message]
2021-10-14 15:05 ` [PATCH v3 1/9] bsd-user/mmap.c: Always zero MAP_ANONYMOUS memory in mmap_frag() Kyle Evans
2021-10-08 21:23 ` [PATCH v3 2/9] bsd-user/mmap.c: check pread's return value to fix warnings with _FORTIFY_SOURCE Warner Losh
2021-10-14 15:06 ` Kyle Evans
2021-10-08 21:23 ` [PATCH v3 3/9] bsd-user/mmap.c: MAP_ symbols are defined, so no need for ifdefs Warner Losh
2021-10-14 15:06 ` Kyle Evans
2021-10-08 21:23 ` [PATCH v3 4/9] bsd-user/mmap.c: mmap return ENOMEM on overflow Warner Losh
2021-10-14 15:13 ` Kyle Evans
2021-10-08 21:23 ` [PATCH v3 5/9] bsd-user/mmap.c: mmap prefer MAP_ANON for BSD Warner Losh
2021-10-14 15:06 ` Kyle Evans
2021-10-08 21:23 ` [PATCH v3 6/9] bsd-user/mmap.c: Convert to qemu_log logging for mmap debugging Warner Losh
2021-10-09 16:01 ` Richard Henderson
2021-10-11 18:52 ` Philippe Mathieu-Daudé
2021-10-18 3:44 ` Kyle Evans
2021-10-08 21:23 ` [PATCH v3 7/9] bsd-user/mmap.c: Don't mmap fd == -1 independently from MAP_ANON flag Warner Losh
2021-10-09 16:03 ` Richard Henderson
2021-10-18 3:43 ` Kyle Evans
2021-10-08 21:23 ` [PATCH v3 8/9] bsd-user/mmap.c: Implement MAP_EXCL, required by jemalloc in head Warner Losh
2021-10-09 16:04 ` Richard Henderson
2021-10-08 21:23 ` [PATCH v3 9/9] bsd-user/mmap.c: assert that target_mprotect cannot fail Warner Losh
2021-10-14 15:13 ` Kyle Evans
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