diff options
| author | Mikaël Urankar <mikael.urankar@gmail.com> | 2017-07-08 13:13:31 +0200 |
|---|---|---|
| committer | Warner Losh <imp@bsdimp.com> | 2021-10-17 16:55:52 -0600 |
| commit | 948516a3fac0bdd47eb127fe1a86148ed86d5c65 (patch) | |
| tree | 219564265174a41a9b29af0f3db659d540849891 /bsd-user | |
| parent | c148a0572130ff485cd2249fbdd1a3260d5e10a4 (diff) | |
bsd-user/mmap.c: Always zero MAP_ANONYMOUS memory in mmap_frag()
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>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
Diffstat (limited to 'bsd-user')
| -rw-r--r-- | bsd-user/mmap.c | 4 |
1 files changed, 3 insertions, 1 deletions
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; } |