[openssh-commits] [openssh] 01/01: use SC_ALLOW_ARG_MASK to limit mmap protections

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djm pushed a commit to branch master
in repository openssh.

commit e83c989bfd9fc9838b7dfb711d1dc6da81814045
Author: Damien Miller <djm at mindrot.org>
Date:   Fri Aug 23 10:19:30 2019 +1000

    use SC_ALLOW_ARG_MASK to limit mmap protections
    
    Restrict to PROT_(READ|WRITE|NONE), i.e. exclude PROT_EXEC
---
 sandbox-seccomp-filter.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sandbox-seccomp-filter.c b/sandbox-seccomp-filter.c
index 7b44755c..840c5232 100644
--- a/sandbox-seccomp-filter.c
+++ b/sandbox-seccomp-filter.c
@@ -216,10 +216,10 @@ static const struct sock_filter preauth_insns[] = {
 	SC_ALLOW(__NR_madvise),
 #endif
 #ifdef __NR_mmap
-	SC_ALLOW(__NR_mmap),
+	SC_ALLOW_ARG_MASK(__NR_mmap, 2, PROT_READ|PROT_WRITE|PROT_NONE),
 #endif
 #ifdef __NR_mmap2
-	SC_ALLOW(__NR_mmap2),
+	SC_ALLOW_ARG_MASK(__NR_mmap2, 2, PROT_READ|PROT_WRITE|PROT_NONE),
 #endif
 #ifdef __NR_mprotect
 	SC_ALLOW_ARG_MASK(__NR_mprotect, 2, PROT_READ|PROT_WRITE|PROT_NONE),

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