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authorTomas Mraz <tmraz@fedoraproject.org>2012-10-10 19:46:02 +0200
committerTomas Mraz <tmraz@fedoraproject.org>2012-10-10 19:46:02 +0200
commitfbcbb0e302b0c7561e565531b47fba9477b238ba (patch)
tree0fd09590cb7c15f11ba9473f81866db694d88529 /modules/pam_namespace
parent6b2a5b9f5595f39fb919c12c52c7f3c53f33f914 (diff)
pam_namespace: add mntopts flag for tmpfs mount options
modules/pam_namespace/pam_namespace.h: Add mount_opts member to polydir structure. modules/pam_namespace/pam_namespace.c (del_polydir): Free the mount_opts. (parse_method): Parse the mntopts flag. (ns_setup): Pass the mount_opts to mount(). modules/pam_namespace/namespace.conf.5.xml: Document the mntopts flag.
Diffstat (limited to 'modules/pam_namespace')
-rw-r--r--modules/pam_namespace/namespace.conf.5.xml8
-rw-r--r--modules/pam_namespace/pam_namespace.c21
-rw-r--r--modules/pam_namespace/pam_namespace.h2
3 files changed, 28 insertions, 3 deletions
diff --git a/modules/pam_namespace/namespace.conf.5.xml b/modules/pam_namespace/namespace.conf.5.xml
index 673099b0..c7698cb4 100644
--- a/modules/pam_namespace/namespace.conf.5.xml
+++ b/modules/pam_namespace/namespace.conf.5.xml
@@ -119,6 +119,14 @@
contain the user name and will be shared among all users.
</para>
+ <para><emphasis>mntopts</emphasis>=<replaceable>value</replaceable>
+ - value of this flag is passed to the mount call when the tmpfs mount is
+ done. It allows for example the specification of the maximum size of the
+ tmpfs instance that is created by the mount call. See <citerefentry>
+ <refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry> for details.
+ </para>
+
<para>
The directory where polyinstantiated instances are to be
created, must exist and must have, by default, the mode of 0000. The
diff --git a/modules/pam_namespace/pam_namespace.c b/modules/pam_namespace/pam_namespace.c
index a40f05e6..e0d5e30b 100644
--- a/modules/pam_namespace/pam_namespace.c
+++ b/modules/pam_namespace/pam_namespace.c
@@ -64,6 +64,7 @@ static void del_polydir(struct polydir_s *poly)
if (poly) {
free(poly->uid);
free(poly->init_script);
+ free(poly->mount_opts);
free(poly);
}
}
@@ -237,9 +238,9 @@ static int parse_method(char *method, struct polydir_s *poly,
static const char *method_names[] = { "user", "context", "level", "tmpdir",
"tmpfs", NULL };
static const char *flag_names[] = { "create", "noinit", "iscript",
- "shared", NULL };
+ "shared", "mntopts", NULL };
static const unsigned int flag_values[] = { POLYDIR_CREATE, POLYDIR_NOINIT,
- POLYDIR_ISCRIPT, POLYDIR_SHARED };
+ POLYDIR_ISCRIPT, POLYDIR_SHARED, POLYDIR_MNTOPTS };
int i;
char *flag;
@@ -279,6 +280,20 @@ static int parse_method(char *method, struct polydir_s *poly,
return -1;
};
break;
+
+ case POLYDIR_MNTOPTS:
+ if (flag[namelen] != '=')
+ break;
+ if (poly->method != TMPFS) {
+ pam_syslog(idata->pamh, LOG_WARNING, "Mount options applicable only to tmpfs method");
+ break;
+ }
+ free(poly->mount_opts); /* if duplicate mntopts specified */
+ if ((poly->mount_opts = strdup(flag+namelen+1)) == NULL) {
+ pam_syslog(idata->pamh, LOG_CRIT, "Memory allocation error");
+ return -1;
+ }
+ break;
}
}
}
@@ -1464,7 +1479,7 @@ static int ns_setup(struct polydir_s *polyptr,
}
if (polyptr->method == TMPFS) {
- if (mount("tmpfs", polyptr->dir, "tmpfs", 0, NULL) < 0) {
+ if (mount("tmpfs", polyptr->dir, "tmpfs", 0, polyptr->mount_opts) < 0) {
pam_syslog(idata->pamh, LOG_ERR, "Error mounting tmpfs on %s, %m",
polyptr->dir);
return PAM_SESSION_ERR;
diff --git a/modules/pam_namespace/pam_namespace.h b/modules/pam_namespace/pam_namespace.h
index 51d23886..47ebcc33 100644
--- a/modules/pam_namespace/pam_namespace.h
+++ b/modules/pam_namespace/pam_namespace.h
@@ -116,6 +116,7 @@
#define POLYDIR_NOINIT 0x00000004 /* no init script */
#define POLYDIR_SHARED 0x00000008 /* share context/level instances among users */
#define POLYDIR_ISCRIPT 0x00000010 /* non default init script */
+#define POLYDIR_MNTOPTS 0x00000020 /* mount options for tmpfs mount */
#define NAMESPACE_MAX_DIR_LEN 80
@@ -164,6 +165,7 @@ struct polydir_s {
uid_t *uid; /* list of override uids */
unsigned int flags; /* polydir flags */
char *init_script; /* path to init script */
+ char *mount_opts; /* mount options for tmpfs mount */
uid_t owner; /* user which should own the polydir */
gid_t group; /* group which should own the polydir */
mode_t mode; /* mode of the polydir */