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https://github.com/freebsd/freebsd-src
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make path matching in devfs rules consistent and sane (and safer)
Before this change path matching had the following features: - for device nodes the patterns were matched against full path - in the above case '/' in a path could be matched by a wildcard - for directories and links only the last component was matched So, for example, a pattern like 're*' could match the following entries: - re0 device - responder/u0 device - zvol/recpool directory Although it was possible to work around this behavior (once it was spotted and understood), it was very confusing and contrary to documentation. Now we always match a full path for all types of devfs entries (devices, directories, links) and a '/' has to be matched explicitly. This behavior follows the shell globbing rules. This change is originally developed by Jaakko Heinonen. Many thanks! PR: kern/122838 Submitted by: jh MFC after: 4 weeks
This commit is contained in:
Andriy Gapon
parent
bd376402de
commit
8e94193e58
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=253677
7
UPDATING
7
UPDATING
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@ -64,6 +64,13 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 10.x IS SLOW:
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even if neither the traced process nor the tracing process had
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write access to that file.
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201306XX:
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Behavior of devfs rules path matching has been changed.
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Pattern is now always matched against fully qualified devfs
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path and slash characters must be explicitly matched by
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slashes in pattern (FNM_PATHNAME). Rulesets involving devfs
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subdirectories must be reviewed.
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20130615:
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CVS has been removed from the base system. An exact copy
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of the code is available from the devel/cvs port.
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@ -101,7 +101,7 @@ struct devfs_ruleset {
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static devfs_rid devfs_rid_input(devfs_rid rid, struct devfs_mount *dm);
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static void devfs_rule_applyde_recursive(struct devfs_krule *dk,
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struct devfs_dirent *de);
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struct devfs_mount *dm, struct devfs_dirent *de);
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static void devfs_rule_applydm(struct devfs_krule *dk, struct devfs_mount *dm);
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static int devfs_rule_autonumber(struct devfs_ruleset *ds, devfs_rnum *rnp);
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static struct devfs_krule *devfs_rule_byid(devfs_rid rid);
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@ -109,13 +109,16 @@ static int devfs_rule_delete(struct devfs_krule *dkp);
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static struct cdev *devfs_rule_getdev(struct devfs_dirent *de);
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static int devfs_rule_input(struct devfs_rule *dr, struct devfs_mount *dm);
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static int devfs_rule_insert(struct devfs_rule *dr);
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static int devfs_rule_match(struct devfs_krule *dk, struct devfs_dirent *de);
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static int devfs_rule_matchpath(struct devfs_krule *dk,
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static int devfs_rule_match(struct devfs_krule *dk, struct devfs_mount *dm,
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struct devfs_dirent *de);
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static void devfs_rule_run(struct devfs_krule *dk, struct devfs_dirent *de, unsigned depth);
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static int devfs_rule_matchpath(struct devfs_krule *dk, struct devfs_mount *dm,
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struct devfs_dirent *de);
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static void devfs_rule_run(struct devfs_krule *dk, struct devfs_mount *dm,
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struct devfs_dirent *de, unsigned depth);
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static void devfs_ruleset_applyde(struct devfs_ruleset *ds,
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struct devfs_dirent *de, unsigned depth);
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struct devfs_mount *dm, struct devfs_dirent *de,
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unsigned depth);
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static void devfs_ruleset_applydm(struct devfs_ruleset *ds,
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struct devfs_mount *dm);
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static struct devfs_ruleset *devfs_ruleset_bynum(devfs_rsnum rsnum);
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@ -146,7 +149,7 @@ devfs_rules_apply(struct devfs_mount *dm, struct devfs_dirent *de)
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sx_slock(&sx_rules);
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ds = devfs_ruleset_bynum(dm->dm_ruleset);
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KASSERT(ds != NULL, ("mount-point has NULL ruleset"));
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devfs_ruleset_applyde(ds, de, devfs_rule_depth);
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devfs_ruleset_applyde(ds, dm, de, devfs_rule_depth);
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sx_sunlock(&sx_rules);
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}
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@ -337,13 +340,14 @@ devfs_rid_input(devfs_rid rid, struct devfs_mount *dm)
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* XXX: a linear search could be done through the cdev list instead.
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*/
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static void
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devfs_rule_applyde_recursive(struct devfs_krule *dk, struct devfs_dirent *de)
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devfs_rule_applyde_recursive(struct devfs_krule *dk, struct devfs_mount *dm,
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struct devfs_dirent *de)
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{
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struct devfs_dirent *de2;
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TAILQ_FOREACH(de2, &de->de_dlist, de_list)
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devfs_rule_applyde_recursive(dk, de2);
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devfs_rule_run(dk, de, devfs_rule_depth);
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devfs_rule_applyde_recursive(dk, dm, de2);
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devfs_rule_run(dk, dm, de, devfs_rule_depth);
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}
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/*
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@ -353,7 +357,7 @@ static void
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devfs_rule_applydm(struct devfs_krule *dk, struct devfs_mount *dm)
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{
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devfs_rule_applyde_recursive(dk, dm->dm_rootdir);
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devfs_rule_applyde_recursive(dk, dm, dm->dm_rootdir);
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}
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/*
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@ -525,7 +529,8 @@ devfs_rule_insert(struct devfs_rule *dr)
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* de; 0, otherwise.
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*/
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static int
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devfs_rule_match(struct devfs_krule *dk, struct devfs_dirent *de)
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devfs_rule_match(struct devfs_krule *dk, struct devfs_mount *dm,
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struct devfs_dirent *de)
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{
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struct devfs_rule *dr = &dk->dk_rule;
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struct cdev *dev;
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@ -558,7 +563,7 @@ devfs_rule_match(struct devfs_krule *dk, struct devfs_dirent *de)
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dev_relthread(dev, ref);
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}
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if (dr->dr_icond & DRC_PATHPTRN)
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if (!devfs_rule_matchpath(dk, de))
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if (!devfs_rule_matchpath(dk, dm, de))
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return (0);
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return (1);
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@ -568,35 +573,43 @@ devfs_rule_match(struct devfs_krule *dk, struct devfs_dirent *de)
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* Determine whether dk matches de on account of dr_pathptrn.
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*/
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static int
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devfs_rule_matchpath(struct devfs_krule *dk, struct devfs_dirent *de)
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devfs_rule_matchpath(struct devfs_krule *dk, struct devfs_mount *dm,
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struct devfs_dirent *de)
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{
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struct devfs_rule *dr = &dk->dk_rule;
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char *pname;
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struct cdev *dev;
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int match;
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char *pname, *specname;
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specname = NULL;
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dev = devfs_rule_getdev(de);
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if (dev != NULL)
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pname = dev->si_name;
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else if (de->de_dirent->d_type == DT_LNK ||
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de->de_dirent->d_type == DT_DIR)
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pname = de->de_dirent->d_name;
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else
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(de->de_dirent->d_type == DT_DIR && de != dm->dm_rootdir &&
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(de->de_flags & (DE_DOT | DE_DOTDOT)) == 0)) {
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specname = malloc(SPECNAMELEN + 1, M_TEMP, M_WAITOK);
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pname = devfs_fqpn(specname, dm, de, NULL);
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} else
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return (0);
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KASSERT(pname != NULL, ("devfs_rule_matchpath: NULL pname"));
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return (fnmatch(dr->dr_pathptrn, pname, 0) == 0);
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KASSERT(pname != NULL, ("devfs_rule_matchpath: NULL pname"));
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match = fnmatch(dr->dr_pathptrn, pname, FNM_PATHNAME) == 0;
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free(specname, M_TEMP);
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return (match);
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}
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/*
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* Run dk on de.
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*/
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static void
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devfs_rule_run(struct devfs_krule *dk, struct devfs_dirent *de, unsigned depth)
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devfs_rule_run(struct devfs_krule *dk, struct devfs_mount *dm,
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struct devfs_dirent *de, unsigned depth)
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{
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struct devfs_rule *dr = &dk->dk_rule;
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struct devfs_ruleset *ds;
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if (!devfs_rule_match(dk, de))
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if (!devfs_rule_match(dk, dm, de))
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return;
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if (dr->dr_iacts & DRA_BACTS) {
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if (dr->dr_bacts & DRB_HIDE)
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@ -623,7 +636,7 @@ devfs_rule_run(struct devfs_krule *dk, struct devfs_dirent *de, unsigned depth)
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if (depth > 0) {
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ds = devfs_ruleset_bynum(dk->dk_rule.dr_incset);
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KASSERT(ds != NULL, ("DRA_INCSET but bad dr_incset"));
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devfs_ruleset_applyde(ds, de, depth - 1);
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devfs_ruleset_applyde(ds, dm, de, depth - 1);
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}
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}
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}
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@ -632,12 +645,13 @@ devfs_rule_run(struct devfs_krule *dk, struct devfs_dirent *de, unsigned depth)
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* Apply all the rules in ds to de.
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*/
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static void
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devfs_ruleset_applyde(struct devfs_ruleset *ds, struct devfs_dirent *de, unsigned depth)
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devfs_ruleset_applyde(struct devfs_ruleset *ds, struct devfs_mount *dm,
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struct devfs_dirent *de, unsigned depth)
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{
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struct devfs_krule *dk;
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TAILQ_FOREACH(dk, &ds->ds_rules, dk_list)
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devfs_rule_run(dk, de, depth);
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devfs_rule_run(dk, dm, de, depth);
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}
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/*
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