commit 27404b6c15c1cddae54e1044c8da815eade109fa
author Helge Deller <deller@gmx.de> Mon Dec 12 18:34:15 2022 +0100
committer Laurent Vivier <laurent@vivier.eu> Fri Feb 03 22:55:12 2023 +0100
tree ce85688aa0136f1ff319e2b7df13e45d01c4d6d8
parent 93cf7e6c4abdbc5e678088cee4e08f615ad39766

linux-user: Implement SOL_ALG encryption support

Add suport to handle SOL_ALG packets via sendmsg() and recvmsg().
This allows emulated userspace to use encryption functionality.

Tested with the debian ell package with hppa guest on x86_64 host.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20221212173416.90590-1-deller@gmx.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/syscall.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 55d53b3..a0d2bed 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1829,6 +1829,14 @@
             __get_user(cred->pid, &target_cred->pid);
             __get_user(cred->uid, &target_cred->uid);
             __get_user(cred->gid, &target_cred->gid);
+        } else if (cmsg->cmsg_level == SOL_ALG) {
+            uint32_t *dst = (uint32_t *)data;
+
+            memcpy(dst, target_data, len);
+            /* fix endianess of first 32-bit word */
+            if (len >= sizeof(uint32_t)) {
+                *dst = tswap32(*dst);
+            }
         } else {
             qemu_log_mask(LOG_UNIMP, "Unsupported ancillary data: %d/%d\n",
                           cmsg->cmsg_level, cmsg->cmsg_type);