From: Helge Deller <[email protected]> Peter Hartley noticed, that in the qemu code the imr_ifindex member of struct target_ip_mreq needs to be of type "int" instead of "long", which is what the Linux kernel uses on all architectures.
Adjust the type accordingly, and add a QEMU_BUILD_BUG_ON() checker to prevent such issues in the future. This change should fix multicast issues when using hosts and guests with different endianess or bit size. Reported-by: Peter Hartley <[email protected]> Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/2553 Signed-off-by: Helge Deller <[email protected]> (cherry picked from commit e2af3eadc09b3672017c650e0abfd29a08521921) Signed-off-by: Michael Tokarev <[email protected]> diff --git a/linux-user/syscall.c b/linux-user/syscall.c index b8b256c430..905db117ff 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -2165,6 +2165,8 @@ static abi_long do_setsockopt(int sockfd, int level, int optname, QEMU_BUILD_BUG_ON(sizeof(struct ip_mreq) != sizeof(struct target_ip_mreq)); + QEMU_BUILD_BUG_ON(sizeof(struct ip_mreqn) != + sizeof(struct target_ip_mreqn)); if (optname == IP_MULTICAST_IF) { min_size = sizeof(struct in_addr); diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h index 86bdf88be7..1c546ce1a0 100644 --- a/linux-user/syscall_defs.h +++ b/linux-user/syscall_defs.h @@ -210,7 +210,7 @@ struct target_ip_mreq { struct target_ip_mreqn { struct target_in_addr imr_multiaddr; struct target_in_addr imr_address; - abi_long imr_ifindex; + abi_int imr_ifindex; }; struct target_ip_mreq_source { -- 2.47.3
