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>

diff --git a/src/lxc/seccomp.c b/src/lxc/seccomp.c
index aa45b0cf608ad0a5c086f5146c458fb5e1b85d6b..00d533e0f9cfa14a06ecf3502e39bed007c58eff 100644 (file)
--- 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");