FreeBSD Bugzilla – Attachment 203197 Details for
Bug 236836
Kernel panic from calling mq_open("/.", ...) as root
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[patch]
Untested patch for rejecting "/." and "/.." with EACCES
mq_special_names.patch (text/plain), 806 bytes, created by
Torbjørn Birch Moltu
on 2019-03-27 21:44:09 UTC
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Description:
Untested patch for rejecting "/." and "/.." with EACCES
Filename:
MIME Type:
Creator:
Torbjørn Birch Moltu
Created:
2019-03-27 21:44:09 UTC
Size:
806 bytes
patch
obsolete
>--- sys/kern/uipc_mqueue.c >+++ sys/kern/uipc_mqueue.c >@@ -2042,6 +2042,9 @@ kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode, > len = strlen(path); > if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) > return (EINVAL); >+ /* "." and ".." are directories and cannot be opened as queues */ >+ if (!strcmp(path, "/.") || !strcmp(path, "/..")) >+ return (EACCES); > AUDIT_ARG_UPATH1_CANON(path); > > error = falloc(td, &fp, &fd, O_CLOEXEC); >@@ -2142,6 +2145,8 @@ sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap) > len = strlen(path); > if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) > return (EINVAL); >+ if (!strcmp(path, "/.") || !strcmp(path, "/..")) >+ return (EACCES); > AUDIT_ARG_UPATH1_CANON(path); > > sx_xlock(&mqfs_data.mi_lock);
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