Author: jamie
Date: Wed Apr 13 20:14:13 2016
New Revision: 297935
URL: https://svnweb.freebsd.org/changeset/base/297935
Log:
Separate POSIX sem/shm objects in jails, by prepending the jail's path
name to the object's "path". While the objects don't have real path
names, it's a filesystem-like namespace, which allows jails to be
kept to their own space, but still allows the system / jail parent to
access a jail's IPC.
PR: 208082
Modified:
head/sys/kern/uipc_sem.c
head/sys/kern/uipc_shm.c
Modified: head/sys/kern/uipc_sem.c
==============================================================================
--- head/sys/kern/uipc_sem.c Wed Apr 13 20:12:02 2016 (r297934)
+++ head/sys/kern/uipc_sem.c Wed Apr 13 20:14:13 2016 (r297935)
@@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/fnv_hash.h>
+#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/ksem.h>
#include <sys/lock.h>
@@ -258,7 +259,9 @@ ksem_closef(struct file *fp, struct thre
static int
ksem_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
{
+ const char *path, *pr_path;
struct ksem *ks;
+ size_t pr_pathlen;
kif->kf_type = KF_TYPE_SEM;
ks = fp->f_data;
@@ -269,7 +272,19 @@ ksem_fill_kinfo(struct file *fp, struct
if (ks->ks_path != NULL) {
sx_slock(&ksem_dict_lock);
if (ks->ks_path != NULL)
- strlcpy(kif->kf_path, ks->ks_path,
sizeof(kif->kf_path));
+ {
+ path = ks->ks_path;
+ pr_path = curthread->td_ucred->cr_prison->pr_path;
+ if (strcmp(pr_path, "/") != 0)
+ {
+ /* Return the jail-rooted pathname */
+ pr_pathlen = strlen(pr_path);
+ if (strncmp(path, pr_path, pr_pathlen) == 0 &&
+ path[pr_pathlen] == '/')
+ path += pr_pathlen;
+ }
+ strlcpy(kif->kf_path, path, sizeof(kif->kf_path));
+ }
sx_sunlock(&ksem_dict_lock);
}
return (0);
@@ -449,6 +464,8 @@ ksem_create(struct thread *td, const cha
struct ksem *ks;
struct file *fp;
char *path;
+ const char *pr_path;
+ size_t pr_pathlen;
Fnv32_t fnv;
int error, fd;
@@ -485,10 +502,15 @@ ksem_create(struct thread *td, const cha
ks->ks_flags |= KS_ANONYMOUS;
} else {
path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK);
- error = copyinstr(name, path, MAXPATHLEN, NULL);
+ pr_path = td->td_ucred->cr_prison->pr_path;
+ /* Construct a full pathname for jailed callers */
+ pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
+ : strlcpy(path, pr_path, MAXPATHLEN);
+ error = copyinstr(name, path + pr_pathlen,
+ MAXPATHLEN - pr_pathlen, NULL);
/* Require paths to start with a '/' character. */
- if (error == 0 && path[0] != '/')
+ if (error == 0 && path[pr_pathlen] != '/')
error = EINVAL;
if (error) {
fdclose(td, fp, fd);
@@ -624,11 +646,17 @@ int
sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap)
{
char *path;
+ const char *pr_path;
+ size_t pr_pathlen;
Fnv32_t fnv;
int error;
path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
- error = copyinstr(uap->name, path, MAXPATHLEN, NULL);
+ pr_path = td->td_ucred->cr_prison->pr_path;
+ pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
+ : strlcpy(path, pr_path, MAXPATHLEN);
+ error = copyinstr(uap->name, path + pr_pathlen, MAXPATHLEN - pr_pathlen,
+ NULL);
if (error) {
free(path, M_TEMP);
return (error);
Modified: head/sys/kern/uipc_shm.c
==============================================================================
--- head/sys/kern/uipc_shm.c Wed Apr 13 20:12:02 2016 (r297934)
+++ head/sys/kern/uipc_shm.c Wed Apr 13 20:14:13 2016 (r297935)
@@ -57,6 +57,7 @@ __FBSDID("$FreeBSD$");
#include <sys/kernel.h>
#include <sys/uio.h>
#include <sys/signal.h>
+#include <sys/jail.h>
#include <sys/ktrace.h>
#include <sys/lock.h>
#include <sys/malloc.h>
@@ -687,6 +688,8 @@ kern_shm_open(struct thread *td, const c
struct shmfd *shmfd;
struct file *fp;
char *path;
+ const char *pr_path;
+ size_t pr_pathlen;
Fnv32_t fnv;
mode_t cmode;
int fd, error;
@@ -723,13 +726,18 @@ kern_shm_open(struct thread *td, const c
shmfd = shm_alloc(td->td_ucred, cmode);
} else {
path = malloc(MAXPATHLEN, M_SHMFD, M_WAITOK);
- error = copyinstr(userpath, path, MAXPATHLEN, NULL);
+ pr_path = td->td_ucred->cr_prison->pr_path;
+ /* Construct a full pathname for jailed callers */
+ pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
+ : strlcpy(path, pr_path, MAXPATHLEN);
+ error = copyinstr(userpath, path + pr_pathlen,
+ MAXPATHLEN - pr_pathlen, NULL);
#ifdef KTRACE
if (error == 0 && KTRPOINT(curthread, KTR_NAMEI))
ktrnamei(path);
#endif
/* Require paths to start with a '/' character. */
- if (error == 0 && path[0] != '/')
+ if (error == 0 && path[pr_pathlen] != '/')
error = EINVAL;
if (error) {
fdclose(td, fp, fd);
@@ -823,11 +831,17 @@ int
sys_shm_unlink(struct thread *td, struct shm_unlink_args *uap)
{
char *path;
+ const char *pr_path;
+ size_t pr_pathlen;
Fnv32_t fnv;
int error;
path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
- error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
+ pr_path = td->td_ucred->cr_prison->pr_path;
+ pr_pathlen = strcmp(pr_path, "/") == 0 ? 0
+ : strlcpy(path, pr_path, MAXPATHLEN);
+ error = copyinstr(uap->path, path + pr_pathlen, MAXPATHLEN - pr_pathlen,
+ NULL);
if (error) {
free(path, M_TEMP);
return (error);
@@ -1060,7 +1074,9 @@ shm_unmap(struct file *fp, void *mem, si
static int
shm_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
{
+ const char *path, *pr_path;
struct shmfd *shmfd;
+ size_t pr_pathlen;
kif->kf_type = KF_TYPE_SHM;
shmfd = fp->f_data;
@@ -1072,8 +1088,19 @@ shm_fill_kinfo(struct file *fp, struct k
if (shmfd->shm_path != NULL) {
sx_slock(&shm_dict_lock);
if (shmfd->shm_path != NULL)
- strlcpy(kif->kf_path, shmfd->shm_path,
- sizeof(kif->kf_path));
+ {
+ path = shmfd->shm_path;
+ pr_path = curthread->td_ucred->cr_prison->pr_path;
+ if (strcmp(pr_path, "/") != 0)
+ {
+ /* Return the jail-rooted pathname */
+ pr_pathlen = strlen(pr_path);
+ if (strncmp(path, pr_path, pr_pathlen) == 0 &&
+ path[pr_pathlen] == '/')
+ path += pr_pathlen;
+ }
+ strlcpy(kif->kf_path, path, sizeof(kif->kf_path));
+ }
sx_sunlock(&shm_dict_lock);
}
return (0);
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