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Bump SPECNAMELEN to MAXNAMLEN.

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This includes the bump for cdevsw d_version.  Otherwise, the impact on
the ABI (not KBI) is surprisingly low.  The most important affected
interface is devname(3) and ttyname(3) which already correctly handle
long names (and ttyname(3) should not be affected at all).

Still, due to the d_version bump, I argue that the change is not MFC-able.

Requested by:	mmacy
Reviewed by:	jhb
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D18932
This commit is contained in:
Konstantin Belousov 2019-01-27 00:46:06 +00:00
parent 8b40aab156
commit e5ac304989
5 changed files with 91 additions and 11 deletions
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5
lib/libprocstat/Symbol.map
View File

@ -35,9 +35,12 @@ FBSD_1.3 {
FBSD_1.5 {
procstat_freeptlwpinfo;
procstat_getptlwpinfo;
procstat_get_pts_info;
procstat_get_sem_info;
procstat_get_shm_info;
procstat_get_socket_info;
};
FBSD_1.6 {
procstat_get_pts_info;
procstat_get_vnode_info;
};

88
lib/libprocstat/libprocstat_compat.c
View File

@ -36,9 +36,11 @@ __FBSDID("$FreeBSD$");
#include "libprocstat.h"
#define SPECNAMELEN_COMPAT12 63
struct freebsd11_ptsstat {
uint32_t dev;
char devname[SPECNAMELEN + 1];
char devname[SPECNAMELEN_COMPAT12 + 1];
};
struct freebsd11_vnstat {
@ -49,7 +51,7 @@ struct freebsd11_vnstat {
uint32_t vn_fsid;
int vn_type;
uint16_t vn_mode;
char vn_devname[SPECNAMELEN + 1];
char vn_devname[SPECNAMELEN_COMPAT12 + 1];
};
struct freebsd11_semstat {
uint32_t value;
@ -75,8 +77,25 @@ struct freebsd11_sockstat {
char dname[32];
};
struct freebsd12_vnstat {
uint64_t vn_fileid;
uint64_t vn_size;
uint64_t vn_dev;
uint64_t vn_fsid;
char *vn_mntdir;
int vn_type;
uint16_t vn_mode;
char vn_devname[SPECNAMELEN_COMPAT12 + 1];
};
struct freebsd12_ptsstat {
uint64_t dev;
char devname[SPECNAMELEN_COMPAT12 + 1];
};
int freebsd11_procstat_get_pts_info(struct procstat *procstat,
struct filestat *fst, struct freebsd11_ptsstat *pts, char *errbuf);
int freebsd12_procstat_get_pts_info(struct procstat *procstat,
struct filestat *fst, struct freebsd12_ptsstat *pts_compat, char *errbuf);
int freebsd11_procstat_get_sem_info(struct procstat *procstat,
struct filestat *fst, struct freebsd11_semstat *sem, char *errbuf);
int freebsd11_procstat_get_shm_info(struct procstat *procstat,
@ -85,6 +104,10 @@ int freebsd11_procstat_get_socket_info(struct procstat *procstat,
struct filestat *fst, struct freebsd11_sockstat *sock, char *errbuf);
int freebsd11_procstat_get_vnode_info(struct procstat *procstat,
struct filestat *fst, struct freebsd11_vnstat *vn, char *errbuf);
int freebsd12_procstat_get_vnode_info(struct procstat *procstat,
struct filestat *fst, struct freebsd12_vnstat *vn_compat, char *errbuf);
static const char trunc_name[] = "<TRUNCATED>";
int
freebsd11_procstat_get_pts_info(struct procstat *procstat,
@ -97,8 +120,30 @@ freebsd11_procstat_get_pts_info(struct procstat *procstat,
if (r != 0)
return (r);
pts_compat->dev = pts.dev;
memcpy(pts_compat->devname, pts.devname,
sizeof(pts_compat->devname));
if (strlen(pts.devname) >= sizeof(pts_compat->devname))
strcpy(pts_compat->devname, trunc_name);
else
memcpy(pts_compat->devname, pts.devname,
sizeof(pts_compat->devname));
return (0);
}
int
freebsd12_procstat_get_pts_info(struct procstat *procstat,
struct filestat *fst, struct freebsd12_ptsstat *pts_compat, char *errbuf)
{
struct ptsstat pts;
int r;
r = procstat_get_pts_info(procstat, fst, &pts, errbuf);
if (r != 0)
return (r);
pts_compat->dev = pts.dev;
if (strlen(pts.devname) >= sizeof(pts_compat->devname))
strcpy(pts_compat->devname, trunc_name);
else
memcpy(pts_compat->devname, pts.devname,
sizeof(pts_compat->devname));
return (0);
}
@ -174,8 +219,36 @@ freebsd11_procstat_get_vnode_info(struct procstat *procstat,
vn_compat->vn_fsid = vn.vn_fsid;
vn_compat->vn_type = vn.vn_type;
vn_compat->vn_mode = vn.vn_mode;
memcpy(vn_compat->vn_devname, vn.vn_devname,
sizeof(vn_compat->vn_devname));
if (strlen(vn.vn_devname) >= sizeof(vn_compat->vn_devname))
strcpy(vn_compat->vn_devname, trunc_name);
else
memcpy(vn_compat->vn_devname, vn.vn_devname,
sizeof(vn_compat->vn_devname));
return (0);
}
int
freebsd12_procstat_get_vnode_info(struct procstat *procstat,
struct filestat *fst, struct freebsd12_vnstat *vn_compat, char *errbuf)
{
struct vnstat vn;
int r;
r = procstat_get_vnode_info(procstat, fst, &vn, errbuf);
if (r != 0)
return (r);
vn_compat->vn_fileid = vn.vn_fileid;
vn_compat->vn_size = vn.vn_size;
vn_compat->vn_mntdir = vn.vn_mntdir;
vn_compat->vn_dev = vn.vn_dev;
vn_compat->vn_fsid = vn.vn_fsid;
vn_compat->vn_type = vn.vn_type;
vn_compat->vn_mode = vn.vn_mode;
if (strlen(vn.vn_devname) >= sizeof(vn_compat->vn_devname))
strcpy(vn_compat->vn_devname, trunc_name);
else
memcpy(vn_compat->vn_devname, vn.vn_devname,
sizeof(vn_compat->vn_devname));
return (0);
}
@ -186,3 +259,6 @@ __sym_compat(procstat_get_vnode_info, freebsd11_procstat_get_vnode_info,
FBSD_1.2);
__sym_compat(procstat_get_sem_info, freebsd11_procstat_get_sem_info, FBSD_1.3);
__sym_compat(procstat_get_shm_info, freebsd11_procstat_get_shm_info, FBSD_1.3);
__sym_compat(procstat_get_pts_info, freebsd12_procstat_get_pts_info, FBSD_1.5);
__sym_compat(procstat_get_vnode_info, freebsd12_procstat_get_vnode_info,
FBSD_1.5);

2
sys/kern/kern_conf.c
View File

@ -630,7 +630,7 @@ prep_cdevsw(struct cdevsw *devsw, int flags)
return (0);
}
if (devsw->d_version != D_VERSION_03) {
if (devsw->d_version != D_VERSION_04) {
printf(
"WARNING: Device driver \"%s\" has wrong version %s\n",
devsw->d_name == NULL ? "???" : devsw->d_name,

3
sys/sys/conf.h
View File

@ -166,7 +166,8 @@ typedef int dumper_hdr_t(struct dumperinfo *di, struct kerneldumpheader *kdh,
#define D_VERSION_01 0x17032005 /* Add d_uid,gid,mode & kind */
#define D_VERSION_02 0x28042009 /* Add d_mmap_single */
#define D_VERSION_03 0x17122009 /* d_mmap takes memattr,vm_ooffset_t */
#define D_VERSION D_VERSION_03
#define D_VERSION_04 0x5c48c353 /* SPECNAMELEN bumped to MAXNAMLEN */
#define D_VERSION D_VERSION_04
/*
* Flags used for internal housekeeping

4
sys/sys/param.h
View File

@ -60,7 +60,7 @@
* in the range 5 to 9.
*/
#undef __FreeBSD_version
#define __FreeBSD_version 1300009 /* Master, propagated to newvers */
#define __FreeBSD_version 1300010 /* Master, propagated to newvers */
/*
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
@ -115,7 +115,7 @@
#define NOFILE OPEN_MAX /* max open files per process */
#define NOGROUP 65535 /* marker for empty group set member */
#define MAXHOSTNAMELEN 256 /* max hostname size */
#define SPECNAMELEN 63 /* max length of devicename */
#define SPECNAMELEN 255 /* max length of devicename */
/* More types and definitions used throughout the kernel. */
#ifdef _KERNEL