seccomp: open memfd read-write

Makes it easier to implement syscalls which need to write to a buffer passed by user space as a pointer. Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

seccomp: open memfd read-write
aad859c4 · Wolfgang Bumiller · 8b4aaf8b · aad859c4
Commit aad859c4 authored Jul 16, 2019 by Wolfgang Bumiller
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seccomp.c src/lxc/seccomp.c +1 -1

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--- a/src/lxc/seccomp.c
+++ b/src/lxc/seccomp.c
@@ -1400,7 +1400,7 @@ int seccomp_notify_handler(int fd, uint32_t events, void *data,
 	}

 	snprintf(mem_path, sizeof(mem_path), "/proc/%d/mem", req->pid);
-	fd_mem = open(mem_path, O_RDONLY | O_CLOEXEC);
+	fd_mem = open(mem_path, O_RDWR | O_CLOEXEC);
 	if (fd_mem < 0) {
 		seccomp_notify_default_answer(fd, req, resp, hdlr);
 		SYSERROR("Failed to open process memory for seccomp notify request");