The sizeof(struct ifreq) is 40 for 64 bit and 32 for 32 bit architectures.
This structure contains a union of other structures, of which struct ifmap
is the biggest for 64 bit architectures. Calling ioclt(…, SIOCGIFCONF, …)
fills a struct sockaddr of that union, and do_ioctl_ifconf() only considered
that struct sockaddr for the size of the union, which has the same size as
struct ifmap on 32 bit architectures. So do_ioctl_ifconf() assumed a wrong
size of 32 for struct ifreq instead of the correct size of 40 on 64 bit
architectures.
The fix makes do_ioctl_ifconf() handle struct ifmap as the biggest part of
the union, treating struct ifreq with the correct size.
Signed-off-by: Stefan <stefan-g...@vodafonemail.de>
---
linux-user/syscall.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index d182890ff0..15a6abadc1 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4902,6 +4902,7 @@ static abi_long do_ioctl_ifconf(const IOCTLEntry *ie,
uint8_t *buf_temp,
struct ifconf *host_ifconf;
uint32_t outbufsz;
const argtype ifreq_arg_type[] = { MK_STRUCT(STRUCT_sockaddr_ifreq) };
+ const argtype ifreq_max_type[] = { MK_STRUCT(STRUCT_ifmap_ifreq) };
int target_ifreq_size;
int nb_ifreq;
int free_buf = 0;
@@ -4925,7 +4926,7 @@ static abi_long do_ioctl_ifconf(const IOCTLEntry *ie,
uint8_t *buf_temp,
host_ifconf = (struct ifconf *)(unsigned long)buf_temp;
target_ifc_buf = (abi_long)(unsigned long)host_ifconf->ifc_buf;
- target_ifreq_size = thunk_type_size(ifreq_arg_type, 0);
+ target_ifreq_size = thunk_type_size(ifreq_max_type, 0);
if (target_ifc_buf != 0) {
target_ifc_len = host_ifconf->ifc_len;
--
2.29.2
