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1.36      +73 -60    src/sys/compat/linux/linux_ipc.c
1.83      +102 -48   src/sys/kern/sysv_shm.c
1.8       +4 -0      src/sys/sys/syscallsubr.h

That change was intended to support vmware3, but
wantrem parameter is useless because vmware3 uses SYSV shared memory
to talk with X server and X server is native application.
The patch worked because check for wantrem was not valid
(wantrem and SHMSEG_REMOVED was never checked for SHMSEG_ALLOCATED segments).

Add kern.ipc.shm_allow_removed (integer, rw) sysctl (default 0) which when set
to 1 allows to return removed segments in
shm_find_segment_by_shmid() and shm_find_segment_by_shmidx().

MFC after:	1 week
This commit is contained in:
Max Khon 2003-11-05 01:53:10 +00:00
parent def19aab78
commit 2332251c6a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=122088
3 changed files with 29 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
sys/compat/linux/linux_ipc.c
View File

@ -716,7 +716,7 @@ linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
/* Perform shmctl wanting removed segments lookup */
error = kern_shmctl(td, args->shmid, IPC_INFO,
(void *)&bsd_shminfo, &bufsz, 1);
(void *)&bsd_shminfo, &bufsz);
if (error)
return error;
@ -731,7 +731,7 @@ linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
/* Perform shmctl wanting removed segments lookup */
error = kern_shmctl(td, args->shmid, SHM_INFO,
(void *)&bsd_shm_info, &bufsz, 1);
(void *)&bsd_shm_info, &bufsz);
if (error)
return error;
@ -744,7 +744,7 @@ linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
case LINUX_IPC_STAT:
/* Perform shmctl wanting removed segments lookup */
error = kern_shmctl(td, args->shmid, IPC_STAT,
(void *)&bsd_shmid, &bufsz, 1);
(void *)&bsd_shmid, &bufsz);
if (error)
return error;
@ -756,7 +756,7 @@ linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
case LINUX_SHM_STAT:
/* Perform shmctl wanting removed segments lookup */
error = kern_shmctl(td, args->shmid, IPC_STAT,
(void *)&bsd_shmid, &bufsz, 1);
(void *)&bsd_shmid, &bufsz);
if (error)
return error;
@ -775,7 +775,7 @@ linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
/* Perform shmctl wanting removed segments lookup */
return kern_shmctl(td, args->shmid, IPC_SET,
(void *)&bsd_shmid, &bufsz, 1);
(void *)&bsd_shmid, &bufsz);
case LINUX_IPC_RMID: {
void *buf;
@ -790,7 +790,7 @@ linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
buf = (void *)&bsd_shmid;
}
return kern_shmctl(td, args->shmid, IPC_RMID, buf, &bufsz, 1);
return kern_shmctl(td, args->shmid, IPC_RMID, buf, &bufsz);
}
case LINUX_SHM_LOCK:

39
sys/kern/sysv_shm.c
View File

@ -97,8 +97,8 @@ struct shmmap_state {
static void shm_deallocate_segment(struct shmid_ds *);
static int shm_find_segment_by_key(key_t);
static struct shmid_ds *shm_find_segment_by_shmid(int, int);
static struct shmid_ds *shm_find_segment_by_shmidx(int, int);
static struct shmid_ds *shm_find_segment_by_shmid(int);
static struct shmid_ds *shm_find_segment_by_shmidx(int);
static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *);
static void shmrealloc(void);
static void shminit(void);
@ -139,6 +139,7 @@ struct shminfo shminfo = {
};
static int shm_use_phys;
static int shm_allow_removed;
SYSCTL_DECL(_kern_ipc);
SYSCTL_INT(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0, "");
@ -148,6 +149,8 @@ SYSCTL_INT(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0, "");
SYSCTL_INT(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0, "");
SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW,
&shm_use_phys, 0, "");
SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW,
&shm_allow_removed, 0, "");
SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLFLAG_RD,
NULL, 0, sysctl_shmsegs, "", "");
@ -165,7 +168,7 @@ shm_find_segment_by_key(key)
}
static struct shmid_ds *
shm_find_segment_by_shmid(int shmid, int wantrem)
shm_find_segment_by_shmid(int shmid)
{
int segnum;
struct shmid_ds *shmseg;
@ -174,23 +177,25 @@ shm_find_segment_by_shmid(int shmid, int wantrem)
if (segnum < 0 || segnum >= shmalloced)
return (NULL);
shmseg = &shmsegs[segnum];
if (!((shmseg->shm_perm.mode & SHMSEG_ALLOCATED) ||
(wantrem && !(shmseg->shm_perm.mode & SHMSEG_REMOVED))) ||
if ((shmseg->shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
(!shm_allow_removed &&
(shmseg->shm_perm.mode & SHMSEG_REMOVED) != 0) ||
shmseg->shm_perm.seq != IPCID_TO_SEQ(shmid))
return (NULL);
return (shmseg);
}
static struct shmid_ds *
shm_find_segment_by_shmidx(int segnum, int wantrem)
shm_find_segment_by_shmidx(int segnum)
{
struct shmid_ds *shmseg;
if (segnum < 0 || segnum >= shmalloced)
return (NULL);
shmseg = &shmsegs[segnum];
if (!((shmseg->shm_perm.mode & SHMSEG_ALLOCATED) ||
(wantrem && !(shmseg->shm_perm.mode & SHMSEG_REMOVED))))
if ((shmseg->shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
(!shm_allow_removed &&
(shmseg->shm_perm.mode & SHMSEG_REMOVED) != 0))
return (NULL);
return (shmseg);
}
@ -294,12 +299,11 @@ struct shmat_args {
* MPSAFE
*/
int
kern_shmat(td, shmid, shmaddr, shmflg, wantrem)
kern_shmat(td, shmid, shmaddr, shmflg)
struct thread *td;
int shmid;
const void *shmaddr;
int shmflg;
int wantrem;
{
struct proc *p = td->td_proc;
int i, flags;
@ -323,7 +327,7 @@ kern_shmat(td, shmid, shmaddr, shmflg, wantrem)
shmmap_s[i].shmid = -1;
p->p_vmspace->vm_shm = shmmap_s;
}
shmseg = shm_find_segment_by_shmid(shmid, wantrem);
shmseg = shm_find_segment_by_shmid(shmid);
if (shmseg == NULL) {
error = EINVAL;
goto done2;
@ -396,7 +400,7 @@ shmat(td, uap)
struct thread *td;
struct shmat_args *uap;
{
return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg, 0);
return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg);
}
struct oshmid_ds {
@ -433,7 +437,7 @@ oshmctl(td, uap)
if (!jail_sysvipc_allowed && jailed(td->td_ucred))
return (ENOSYS);
mtx_lock(&Giant);
shmseg = shm_find_segment_by_shmid(uap->shmid, 0);
shmseg = shm_find_segment_by_shmid(uap->shmid);
if (shmseg == NULL) {
error = EINVAL;
goto done2;
@ -481,13 +485,12 @@ struct shmctl_args {
* MPSAFE
*/
int
kern_shmctl(td, shmid, cmd, buf, bufsz, wantrem)
kern_shmctl(td, shmid, cmd, buf, bufsz)
struct thread *td;
int shmid;
int cmd;
void *buf;
size_t *bufsz;
int wantrem;
{
int error = 0;
struct shmid_ds *shmseg;
@ -519,9 +522,9 @@ kern_shmctl(td, shmid, cmd, buf, bufsz, wantrem)
}
}
if (cmd == SHM_STAT)
shmseg = shm_find_segment_by_shmidx(shmid, wantrem);
shmseg = shm_find_segment_by_shmidx(shmid);
else
shmseg = shm_find_segment_by_shmid(shmid, wantrem);
shmseg = shm_find_segment_by_shmid(shmid);
if (shmseg == NULL) {
error = EINVAL;
goto done2;
@ -592,7 +595,7 @@ shmctl(td, uap)
goto done;
}
error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz, 0);
error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
if (error)
goto done;

4
sys/sys/syscallsubr.h
View File

@ -75,9 +75,9 @@ int kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou,
int kern_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
struct mbuf *control);
int kern_shmat(struct thread *td, int shmid, const void *shmaddr,
int shmflg, int wantrem);
int shmflg);
int kern_shmctl(struct thread *td, int shmid, int cmd, void *buf,
size_t *bufsz, int wantrem);
size_t *bufsz);
int kern_sigaction(struct thread *td, int sig, struct sigaction *act,
struct sigaction *oact, int flags);
int kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss);