linux(4): Handle 64-bit SO_TIMESTAMP for 32-bit binaries

To solve y2k38 problem in the recvmsg syscall the new SO_TIMESTAMP
constant were added on v5.1 Linux kernel. So, old 32-bit binaries
that knows only 32-bit time_t uses the old value of the constant,
and binaries that knows 64-bit time_t uses the new constant.

To determine what size of time_t type is expected by the user-space,
store requested value (SO_TIMESTAMP) in the process emuldata structure.

MFC after:		2 weeks
This commit is contained in:
Dmitry Chagin 2022-05-28 23:45:39 +03:00
parent 6335583990
commit 0e26e54bdf
5 changed files with 70 additions and 17 deletions

View File

@ -93,6 +93,11 @@ typedef struct {
l_suseconds_t tv_usec;
} l_timeval;
typedef struct {
l_time64_t tv_sec;
l_time64_t tv_usec;
} l_sock_timeval;
#define l_fd_set fd_set
/*

View File

@ -76,6 +76,7 @@ struct linux_pemuldata {
uint32_t persona; /* process execution domain */
uint32_t ptrace_flags; /* used by ptrace(2) */
uint32_t oom_score_adj; /* /proc/self/oom_score_adj */
uint32_t so_timestamp; /* requested timeval */
};
#define LINUX_PEM_XLOCK(p) sx_xlock(&(p)->pem_sx)

View File

@ -76,6 +76,7 @@ __FBSDID("$FreeBSD$");
#include <machine/../linux/linux_proto.h>
#endif
#include <compat/linux/linux_common.h>
#include <compat/linux/linux_emul.h>
#include <compat/linux/linux_file.h>
#include <compat/linux/linux_mib.h>
#include <compat/linux/linux_socket.h>
@ -547,7 +548,8 @@ linux_to_bsd_so_sockopt(int opt)
return (SO_RCVTIMEO);
case LINUX_SO_SNDTIMEO:
return (SO_SNDTIMEO);
case LINUX_SO_TIMESTAMP:
case LINUX_SO_TIMESTAMPO:
case LINUX_SO_TIMESTAMPN:
return (SO_TIMESTAMP);
case LINUX_SO_ACCEPTCONN:
return (SO_ACCEPTCONN);
@ -644,8 +646,11 @@ linux_to_bsd_cmsg_type(int cmsg_type)
}
static int
bsd_to_linux_cmsg_type(int cmsg_type)
bsd_to_linux_cmsg_type(struct proc *p, int cmsg_type)
{
struct linux_pemuldata *pem;
pem = pem_find(p);
switch (cmsg_type) {
case SCM_RIGHTS:
@ -655,7 +660,7 @@ bsd_to_linux_cmsg_type(int cmsg_type)
case SCM_CREDS2:
return (LINUX_SCM_CREDENTIALS);
case SCM_TIMESTAMP:
return (LINUX_SCM_TIMESTAMP);
return (pem->so_timestamp);
}
return (-1);
}
@ -1583,28 +1588,55 @@ recvmsg_scm_creds2(socklen_t *datalen, void **data, void **udata)
_Static_assert(sizeof(struct sockcred2) >= sizeof(struct l_ucred),
"scm_creds2 sizeof l_ucred");
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
static int
recvmsg_scm_timestamp(socklen_t *datalen, void **data, void **udata)
recvmsg_scm_timestamp(l_int msg_type, socklen_t *datalen, void **data,
void **udata)
{
struct timeval *ftmvl;
l_timeval *ltv;
l_sock_timeval ltv64;
l_timeval ltv;
struct timeval *tv;
socklen_t len;
void *buf;
if (*datalen != sizeof(struct timeval))
return (EMSGSIZE);
ftmvl = *data;
ltv = malloc(sizeof(*ltv), M_LINUX, M_WAITOK);
ltv->tv_sec = ftmvl->tv_sec;
ltv->tv_usec = ftmvl->tv_usec;
*data = *udata = ltv;
*datalen = sizeof(*ltv);
tv = *data;
#if defined(COMPAT_LINUX32)
if (msg_type == LINUX_SCM_TIMESTAMPO &&
(tv->tv_sec > INT_MAX || tv->tv_sec < INT_MIN))
return (EOVERFLOW);
#endif
if (msg_type == LINUX_SCM_TIMESTAMPN)
len = sizeof(ltv64);
else
len = sizeof(ltv);
buf = malloc(len, M_LINUX, M_WAITOK);
if (msg_type == LINUX_SCM_TIMESTAMPN) {
ltv64.tv_sec = tv->tv_sec;
ltv64.tv_usec = tv->tv_usec;
memmove(buf, &ltv64, len);
} else {
ltv.tv_sec = tv->tv_sec;
ltv.tv_usec = tv->tv_usec;
memmove(buf, &ltv, len);
}
*data = *udata = buf;
*datalen = len;
return (0);
}
#else
_Static_assert(sizeof(struct timeval) == sizeof(l_timeval),
"scm_timestamp sizeof l_timeval");
#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
static int
linux_recvmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr,
l_uint flags, struct msghdr *msg)
{
struct proc *p = td->td_proc;
struct cmsghdr *cm;
struct l_cmsghdr *linux_cmsg = NULL;
socklen_t datalen, maxlen, outlen;
@ -1685,7 +1717,7 @@ linux_recvmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr,
outlen = 0;
while (cm != NULL) {
linux_cmsg->cmsg_type =
bsd_to_linux_cmsg_type(cm->cmsg_type);
bsd_to_linux_cmsg_type(p, cm->cmsg_type);
linux_cmsg->cmsg_level =
bsd_to_linux_sockopt_level(cm->cmsg_level);
if (linux_cmsg->cmsg_type == -1 ||
@ -1718,8 +1750,10 @@ linux_recvmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr,
break;
case SCM_TIMESTAMP:
error = recvmsg_scm_timestamp(&datalen,
&data, &udata);
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
error = recvmsg_scm_timestamp(linux_cmsg->cmsg_type,
&datalen, &data, &udata);
#endif
break;
}
if (error != 0)
@ -1894,6 +1928,8 @@ linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
int
linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
{
struct proc *p = td->td_proc;
struct linux_pemuldata *pem;
l_timeval linux_tv;
struct sockaddr *sa;
struct timeval tv;
@ -1920,6 +1956,10 @@ linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
return (kern_setsockopt(td, args->s, level,
name, &tv, UIO_SYSSPACE, sizeof(tv)));
/* NOTREACHED */
case SO_TIMESTAMP:
pem = pem_find(p);
pem->so_timestamp = args->optname;
break;
default:
break;
}

View File

@ -187,7 +187,8 @@ int linux_accept(struct thread *td, struct linux_accept_args *args);
#define LINUX_SO_RCVTIMEO 20
#define LINUX_SO_SNDTIMEO 21
#endif
#define LINUX_SO_TIMESTAMP 29
#define LINUX_SO_TIMESTAMPO 29
#define LINUX_SO_TIMESTAMPN 63
#define LINUX_SO_ACCEPTCONN 30
#define LINUX_SO_PEERSEC 31
#define LINUX_SO_SNDBUFFORCE 32
@ -200,7 +201,8 @@ int linux_accept(struct thread *td, struct linux_accept_args *args);
#define LINUX_SCM_RIGHTS 0x01
#define LINUX_SCM_CREDENTIALS 0x02
#define LINUX_SCM_TIMESTAMP LINUX_SO_TIMESTAMP
#define LINUX_SCM_TIMESTAMPO LINUX_SO_TIMESTAMPO
#define LINUX_SCM_TIMESTAMPN LINUX_SO_TIMESTAMPN
/* Socket options */
#define LINUX_IP_TOS 1

View File

@ -85,6 +85,11 @@ typedef struct {
l_suseconds_t tv_usec;
} l_timeval;
typedef struct {
l_time64_t tv_sec;
l_time64_t tv_usec;
} l_sock_timeval;
#define l_fd_set fd_set
/*