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Index: sys/kern/kern_sig.c
===================================================================
--- sys/kern/kern_sig.c
+++ sys/kern/kern_sig.c
@@ -3300,6 +3300,87 @@
CTLFLAG_MPSAFE, 0, 0, sysctl_kern_corefile, "A",
"Process corefile name format string");
+/*
+ * If the core format has a %I in it, then we need to check
+ * for existing corefiles before defining a name.
+ * To do this we iterate over 0..num_cores to find a
+ * non-existing core file name to use. If all core files are
+ * already used we choose the oldest one.
+ */
+static int
+corefile_open_last(struct thread *td, char *name, int indexpos,
+ struct vnode **vpp)
+{
+ struct vnode *oldvp, *nextvp;
+ struct nameidata nd;
+ struct stat sb;
+ int error, i, flags, oflags, cmode;
+ time_t lastsec;
+
+ nextvp = oldvp = NULL;
+ cmode = S_IRUSR | S_IWUSR;
+ oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
+ (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
+
+ for (i = 0; i < num_cores; i++) {
+ struct vnode *vp;
+
+ flags = O_CREAT | FWRITE | O_NOFOLLOW;
+ name[indexpos] = '0' + i;
+
+ NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
+ error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
+ NULL);
+ if (error != 0)
+ break;
+
+ vp = nd.ni_vp;
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ if ((flags & O_CREAT) == O_CREAT) {
+ nextvp = vp;
+ break;
+ }
+
+ error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td);
+ if (error != 0) {
+ VOP_UNLOCK(vp, 0);
+ vn_close(vp, FWRITE, td->td_ucred, td);
+ break;
+ }
+
+ if (oldvp == NULL || lastsec >= sb.st_mtim.tv_sec) {
+ if (oldvp != NULL) {
+ VOP_UNLOCK(oldvp, 0);
+ vn_close(oldvp, FWRITE, td->td_ucred, td);
+ }
+ oldvp = vp;
+ lastsec = sb.st_mtim.tv_sec;
+ } else {
+ VOP_UNLOCK(vp, 0);
+ vn_close(vp, FWRITE, td->td_ucred, td);
+ }
+ }
+
+ if (oldvp != NULL) {
+ if (nextvp == NULL) {
+ nextvp = oldvp;
+ } else {
+ VOP_UNLOCK(oldvp, 0);
+ vn_close(oldvp, FWRITE, td->td_ucred, td);
+ }
+ }
+ if (error != 0) {
+ if (nextvp != NULL) {
+ VOP_UNLOCK(nextvp, 0);
+ vn_close(nextvp, FWRITE, td->td_ucred, td);
+ }
+ } else {
+ *vpp = nextvp;
+ }
+
+ return (error);
+}
+
/*
* corefile_open(comm, uid, pid, td, compress, vpp, namep)
* Expand the name described in corefilename, using name, uid, and pid
@@ -3316,11 +3397,10 @@
corefile_open(const char *comm, uid_t uid, pid_t pid, struct thread *td,
int compress, struct vnode **vpp, char **namep)
{
- struct nameidata nd;
struct sbuf sb;
const char *format;
char *hostname, *name;
- int indexpos, i, error, cmode, flags, oflags;
+ int indexpos, error, i;
hostname = NULL;
format = corefilename;
@@ -3386,48 +3466,39 @@
sbuf_finish(&sb);
sbuf_delete(&sb);
- cmode = S_IRUSR | S_IWUSR;
- oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
- (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
-
- /*
- * If the core format has a %I in it, then we need to check
- * for existing corefiles before returning a name.
- * To do this we iterate over 0..num_cores to find a
- * non-existing core file name to use.
- */
if (indexpos != -1) {
- for (i = 0; i < num_cores; i++) {
- flags = O_CREAT | O_EXCL | FWRITE | O_NOFOLLOW;
- name[indexpos] = '0' + i;
- NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
- error = vn_open_cred(&nd, &flags, cmode, oflags,
- td->td_ucred, NULL);
- if (error) {
- if (error == EEXIST)
- continue;
- log(LOG_ERR,
- "pid %d (%s), uid (%u): Path `%s' failed "
- "on initial open test, error = %d\n",
- pid, comm, uid, name, error);
- }
- goto out;
+ error = corefile_open_last(td, name, indexpos, vpp);
+ if (error != 0) {
+ log(LOG_ERR,
+ "pid %d (%s), uid (%u): Path `%s' failed "
+ "on initial open test, error = %d\n",
+ pid, comm, uid, name, error);
+ }
+ } else {
+ struct nameidata nd;
+ int cmode, flags, oflags;
+
+ cmode = S_IRUSR | S_IWUSR;
+ oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
+ (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
+ flags = O_CREAT | FWRITE | O_NOFOLLOW;
+
+ NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
+ error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
+ NULL);
+ if (error == 0) {
+ *vpp = nd.ni_vp;
+ NDFREE(&nd, NDF_ONLY_PNBUF);
}
}
- flags = O_CREAT | FWRITE | O_NOFOLLOW;
- NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
- error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred, NULL);
-out:
- if (error) {
+ if (error != 0) {
#ifdef AUDIT
audit_proc_coredump(td, name, error);
#endif
free(name, M_TEMP);
return (error);
}
- NDFREE(&nd, NDF_ONLY_PNBUF);
- *vpp = nd.ni_vp;
*namep = name;
return (0);
}

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