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Make struct xinpcb and friends word-size independent.

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Replace size_t members with ksize_t (uint64_t) and pointer members
(never used as pointers in userspace, but instead as unique
idenitifiers) with kvaddr_t (uint64_t). This makes the structs
identical between 32-bit and 64-bit ABIs.

On 64-bit bit systems, the ABI is maintained. On 32-bit systems,
this is an ABI breaking change. The ABI of most of these structs
was previously broken in r315662.  This also imposes a small API
change on userspace consumers who must handle kernel pointers
becoming virtual addresses.

PR:		228301 (exp-run by antoine)
Reviewed by:	jtl, kib, rwatson (various versions)
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D15386
This commit is contained in:
brooks 2018-07-05 13:13:48 +00:00
parent 38475506db
commit 6615ed4c61
18 changed files with 73 additions and 54 deletions
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8
UPDATING
View File

@ -31,6 +31,14 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
disable the most expensive debugging functionality run
"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
20180705:
The ABI of syscalls used by management tools like sockstat and
netstat has been broken to allow 32-bit binaries to work on
64-bit kernels without modification. These programs will need
to match the kernel in order to function. External programs may
require minor modifications to accommodate a change of type in
structures from pointers to 64-bit virtual addresses.
20180702:
On i386 and amd64 atomics are now inlined. Out of tree modules using
atomics will need to be rebuilt.

2
lib/libkvm/kvm.h
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@ -61,8 +61,6 @@ typedef __ssize_t ssize_t;
#define _SSIZE_T_DECLARED
#endif
typedef uint64_t kvaddr_t; /* An address in a target image. */
struct kvm_nlist {
const char *n_name;
unsigned char n_type;

8
sys/kern/kern_descrip.c
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@ -3362,10 +3362,10 @@ sysctl_kern_file(SYSCTL_HANDLER_ARGS)
if ((fp = fdp->fd_ofiles[n].fde_file) == NULL)
continue;
xf.xf_fd = n;
xf.xf_file = fp;
xf.xf_data = fp->f_data;
xf.xf_vnode = fp->f_vnode;
xf.xf_type = fp->f_type;
xf.xf_file = (kvaddr_t)fp;
xf.xf_data = (kvaddr_t)fp->f_data;
xf.xf_vnode = (kvaddr_t)fp->f_vnode;
xf.xf_type = (kvaddr_t)fp->f_type;
xf.xf_count = fp->f_count;
xf.xf_msgcount = 0;
xf.xf_offset = foffset_get(fp);

4
sys/kern/uipc_socket.c
View File

@ -3985,12 +3985,12 @@ sotoxsocket(struct socket *so, struct xsocket *xso)
{
xso->xso_len = sizeof *xso;
xso->xso_so = so;
xso->xso_so = (kvaddr_t)so;
xso->so_type = so->so_type;
xso->so_options = so->so_options;
xso->so_linger = so->so_linger;
xso->so_state = so->so_state;
xso->so_pcb = so->so_pcb;
xso->so_pcb = (kvaddr_t)so->so_pcb;
xso->xso_protocol = so->so_proto->pr_protocol;
xso->xso_family = so->so_proto->pr_domain->dom_family;
xso->so_timeo = so->so_timeo;

10
sys/kern/uipc_usrreq.c
View File

@ -1853,7 +1853,7 @@ unp_pcblist(SYSCTL_HANDLER_ARGS)
if (freeunp == 0 && unp->unp_gencnt <= gencnt) {
xu->xu_len = sizeof *xu;
xu->xu_unpp = unp;
xu->xu_unpp = (kvaddr_t)unp;
/*
* XXX - need more locking here to protect against
* connect/disconnect races for SMP.
@ -1870,10 +1870,10 @@ unp_pcblist(SYSCTL_HANDLER_ARGS)
unp->unp_conn->unp_addr->sun_len);
else
bzero(&xu->xu_caddr, sizeof(xu->xu_caddr));
xu->unp_vnode = unp->unp_vnode;
xu->unp_conn = unp->unp_conn;
xu->xu_firstref = LIST_FIRST(&unp->unp_refs);
xu->xu_nextref = LIST_NEXT(unp, unp_reflink);
xu->unp_vnode = (kvaddr_t)unp->unp_vnode;
xu->unp_conn = (kvaddr_t)unp->unp_conn;
xu->xu_firstref = (kvaddr_t)LIST_FIRST(&unp->unp_refs);
xu->xu_nextref = (kvaddr_t)LIST_NEXT(unp, unp_reflink);
xu->unp_gencnt = unp->unp_gencnt;
sotoxsocket(unp->unp_socket, &xu->xu_socket);
UNP_PCB_UNLOCK(unp);

2
sys/netinet/in_pcb.c
View File

@ -2906,7 +2906,7 @@ in_pcbtoxinpcb(const struct inpcb *inp, struct xinpcb *xi)
bzero(&xi->xi_socket, sizeof(struct xsocket));
bcopy(&inp->inp_inc, &xi->inp_inc, sizeof(struct in_conninfo));
xi->inp_gencnt = inp->inp_gencnt;
xi->inp_ppcb = inp->inp_ppcb;
xi->inp_ppcb = (kvaddr_t)inp->inp_ppcb;
xi->inp_flow = inp->inp_flow;
xi->inp_flowid = inp->inp_flowid;
xi->inp_flowtype = inp->inp_flowtype;

8
sys/netinet/in_pcb.h
View File

@ -366,12 +366,12 @@ struct inpcb {
*/
#ifdef _SYS_SOCKETVAR_H_
struct xinpcb {
size_t xi_len; /* length of this structure */
ksize_t xi_len; /* length of this structure */
struct xsocket xi_socket; /* (s,p) */
struct in_conninfo inp_inc; /* (s,p) */
uint64_t inp_gencnt; /* (s,p) */
union {
void *inp_ppcb; /* (s) netstat(1) */
kvaddr_t inp_ppcb; /* (s) netstat(1) */
int64_t ph_ppcb;
};
int64_t inp_spare64[4];
@ -394,10 +394,12 @@ struct xinpcb {
} __aligned(8);
struct xinpgen {
size_t xig_len; /* length of this structure */
ksize_t xig_len; /* length of this structure */
u_int xig_count; /* number of PCBs at this time */
uint32_t _xig_spare32;
inp_gen_t xig_gen; /* generation count at this time */
so_gen_t xig_sogen; /* socket generation count this time */
uint64_t _xig_spare64[4];
} __aligned(8);
#ifdef _KERNEL
void in_pcbtoxinpcb(const struct inpcb *, struct xinpcb *);

2
sys/netinet/sctp_sysctl.c
View File

@ -409,7 +409,7 @@ sctp_sysctl_handle_assoclist(SYSCTL_HANDLER_ARGS)
xinpcb.total_recvs = inp->total_recvs;
xinpcb.total_nospaces = inp->total_nospaces;
xinpcb.fragmentation_point = inp->sctp_frag_point;
xinpcb.socket = inp->sctp_socket;
xinpcb.socket = (kvaddr_t)inp->sctp_socket;
so = inp->sctp_socket;
if ((so == NULL) ||
(!SCTP_IS_LISTENING(inp)) ||

9
sys/netinet/sctp_uio.h
View File

@ -1175,14 +1175,11 @@ struct xsctp_inpcb {
uint16_t local_port;
uint16_t qlen_old;
uint16_t maxqlen_old;
void *socket;
uint16_t __spare16;
kvaddr_t socket;
uint32_t qlen;
uint32_t maxqlen;
#if defined(__LP64__)
uint32_t extra_padding[27]; /* future */
#else
uint32_t extra_padding[28]; /* future */
#endif
uint32_t extra_padding[26]; /* future */
};
struct xsctp_tcb {

2
sys/netinet/tcp_var.h
View File

@ -677,7 +677,7 @@ void hhook_run_tcp_est_out(struct tcpcb *tp,
*/
#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
struct xtcpcb {
size_t xt_len; /* length of this structure */
ksize_t xt_len; /* length of this structure */
struct xinpcb xt_inp;
char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */
char xt_logid[TCP_LOG_ID_LEN]; /* (s) */

13
sys/sys/file.h
View File

@ -209,18 +209,23 @@ struct file {
* Userland version of struct file, for sysctl
*/
struct xfile {
size_t xf_size; /* size of struct xfile */
ksize_t xf_size; /* size of struct xfile */
pid_t xf_pid; /* owning process */
uid_t xf_uid; /* effective uid of owning process */
int xf_fd; /* descriptor number */
void *xf_file; /* address of struct file */
int _xf_int_pad1;
kvaddr_t xf_file; /* address of struct file */
short xf_type; /* descriptor type */
short _xf_short_pad1;
int xf_count; /* reference count */
int xf_msgcount; /* references from message queue */
int _xf_int_pad2;
off_t xf_offset; /* file offset */
void *xf_data; /* file descriptor specific data */
void *xf_vnode; /* vnode pointer */
kvaddr_t xf_data; /* file descriptor specific data */
kvaddr_t xf_vnode; /* vnode pointer */
u_int xf_flag; /* flags (see fcntl.h) */
int _xf_int_pad3;
int64_t _xf_int64_pad[6];
};
#ifdef _KERNEL

2
sys/sys/param.h
View File

@ -60,7 +60,7 @@
* in the range 5 to 9.
*/
#undef __FreeBSD_version
#define __FreeBSD_version 1200071 /* Master, propagated to newvers */
#define __FreeBSD_version 1200072 /* Master, propagated to newvers */
/*
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,

6
sys/sys/socketvar.h
View File

@ -474,13 +474,13 @@ int accept_filt_generic_mod_event(module_t mod, int event, void *data);
* Structure to export socket from kernel to utilities, via sysctl(3).
*/
struct xsocket {
size_t xso_len; /* length of this structure */
ksize_t xso_len; /* length of this structure */
union {
void *xso_so; /* kernel address of struct socket */
kvaddr_t xso_so; /* kernel address of struct socket */
int64_t ph_so;
};
union {
void *so_pcb; /* kernel address of struct inpcb */
kvaddr_t so_pcb; /* kernel address of struct inpcb */
int64_t ph_pcb;
};
uint64_t so_oobmark;

9
sys/sys/types.h
View File

@ -251,6 +251,15 @@ struct cap_rights;
typedef struct cap_rights cap_rights_t;
#endif
/*
* Types suitable for exporting size and pointers (as virtual addresses)
* from the kernel independent of native word size. These should be
* used in place of size_t and (u)intptr_t in structs which contain such
* types that are shared with userspace.
*/
typedef __uint64_t kvaddr_t;
typedef __uint64_t ksize_t;
typedef __vm_offset_t vm_offset_t;
typedef __int64_t vm_ooffset_t;
typedef __vm_paddr_t vm_paddr_t;

14
sys/sys/unpcb.h
View File

@ -138,12 +138,12 @@ struct unpcb {
*/
#ifdef _SYS_SOCKETVAR_H_
struct xunpcb {
size_t xu_len; /* length of this structure */
void *xu_unpp; /* to help netstat, fstat */
void *unp_vnode; /* (s) */
void *unp_conn; /* (s) */
void *xu_firstref; /* (s) */
void *xu_nextref; /* (s) */
ksize_t xu_len; /* length of this structure */
kvaddr_t xu_unpp; /* to help netstat, fstat */
kvaddr_t unp_vnode; /* (s) */
kvaddr_t unp_conn; /* (s) */
kvaddr_t xu_firstref; /* (s) */
kvaddr_t xu_nextref; /* (s) */
unp_gen_t unp_gencnt; /* (s) */
int64_t xu_spare64[8];
int32_t xu_spare32[8];
@ -159,7 +159,7 @@ struct xunpcb {
} __aligned(8);
struct xunpgen {
size_t xug_len;
ksize_t xug_len;
u_int xug_count;
unp_gen_t xug_gen;
so_gen_t xug_sogen;

4
usr.bin/netstat/inet.c
View File

@ -159,12 +159,12 @@ sotoxsocket(struct socket *so, struct xsocket *xso)
bzero(xso, sizeof *xso);
xso->xso_len = sizeof *xso;
xso->xso_so = so;
xso->xso_so = (kvaddr_t)so;
xso->so_type = so->so_type;
xso->so_options = so->so_options;
xso->so_linger = so->so_linger;
xso->so_state = so->so_state;
xso->so_pcb = so->so_pcb;
xso->so_pcb = (kvaddr_t)so->so_pcb;
if (kread((uintptr_t)so->so_proto, &proto, sizeof(proto)) != 0)
return (-1);
xso->xso_protocol = proto.pr_protocol;

2
usr.bin/netstat/unix.c
View File

@ -153,7 +153,7 @@ pcblist_kvm(u_long count_off, u_long gencnt_off, u_long head_off, char **bufp)
xu.xu_len = sizeof xu;
KREAD(head_off, &head, sizeof(head));
LIST_FOREACH(unp, &head, unp_link) {
xu.xu_unpp = unp;
xu.xu_unpp = (kvaddr_t)unp;
KREAD(unp, &unp0, sizeof (*unp));
unp = &unp0;

22
usr.bin/sockstat/sockstat.c
View File

@ -108,8 +108,8 @@ struct addr {
};
struct sock {
void *socket;
void *pcb;
kvaddr_t socket;
kvaddr_t pcb;
int shown;
int vflag;
int family;
@ -789,8 +789,8 @@ gather_unix(int proto)
warnx("struct xunpcb size mismatch");
goto out;
}
if ((xup->unp_conn == NULL && !opt_l) ||
(xup->unp_conn != NULL && !opt_c))
if ((xup->unp_conn == 0 && !opt_l) ||
(xup->unp_conn != 0 && !opt_c))
continue;
if ((sock = calloc(1, sizeof(*sock))) == NULL)
err(1, "malloc()");
@ -806,8 +806,8 @@ gather_unix(int proto)
if (xup->xu_addr.sun_family == AF_UNIX)
laddr->address =
*(struct sockaddr_storage *)(void *)&xup->xu_addr;
else if (xup->unp_conn != NULL)
*(void **)&(faddr->address) = xup->unp_conn;
else if (xup->unp_conn != 0)
*(kvaddr_t*)&(faddr->address) = xup->unp_conn;
laddr->next = NULL;
faddr->next = NULL;
sock->laddr = laddr;
@ -1008,7 +1008,7 @@ sctp_path_state(int state)
static void
displaysock(struct sock *s, int pos)
{
void *p;
kvaddr_t p;
int hash, first, offset;
struct addr *laddr, *faddr;
struct sock *s_tmp;
@ -1054,8 +1054,8 @@ displaysock(struct sock *s, int pos)
break;
}
/* client */
p = *(void **)&(faddr->address);
if (p == NULL) {
p = *(kvaddr_t*)&(faddr->address);
if (p == 0) {
pos += xprintf("(not connected)");
offset += opt_w ? 92 : 44;
break;
@ -1174,13 +1174,13 @@ display(void)
}
setpassent(1);
for (xf = xfiles, n = 0; n < nxfiles; ++n, ++xf) {
if (xf->xf_data == NULL)
if (xf->xf_data == 0)
continue;
if (opt_j >= 0 && opt_j != getprocjid(xf->xf_pid))
continue;
hash = (int)((uintptr_t)xf->xf_data % HASHSIZE);
for (s = sockhash[hash]; s != NULL; s = s->next) {
if ((void *)s->socket != xf->xf_data)
if (s->socket != xf->xf_data)
continue;
if (!check_ports(s))
continue;