The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=35d83ba2355692a4d323936086bbf36aa95ce43b
commit 35d83ba2355692a4d323936086bbf36aa95ce43b Author: Ryan Libby <[email protected]> AuthorDate: 2021-02-25 20:11:19 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2021-05-22 09:38:29 +0000 Close races in vm object chain traversal for unlock (cherry picked from commit d7671ad8d6ebe205933628466dc0a52d32eea2e8) --- sys/fs/procfs/procfs_map.c | 5 +++-- sys/kern/kern_proc.c | 6 +++--- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/sys/fs/procfs/procfs_map.c b/sys/fs/procfs/procfs_map.c index eaa1cf8d4d35..9ee49b0149a2 100644 --- a/sys/fs/procfs/procfs_map.c +++ b/sys/fs/procfs/procfs_map.c @@ -84,7 +84,7 @@ procfs_doprocmap(PFS_FILL_ARGS) struct vnode *vp; char *fullpath, *freepath, *type; struct ucred *cred; - vm_object_t obj, tobj, lobj; + vm_object_t lobj, nobj, obj, tobj; int error, privateresident, ref_count, resident, shadow_count, flags; vm_offset_t e_start, e_end; vm_eflags_t e_eflags; @@ -144,7 +144,8 @@ procfs_doprocmap(PFS_FILL_ARGS) } if (obj != NULL) kern_proc_vmmap_resident(map, entry, &resident, &super); - for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { + for (tobj = obj; tobj != NULL; tobj = nobj) { + nobj = tobj->backing_object; if (tobj != obj && tobj != lobj) VM_OBJECT_RUNLOCK(tobj); } diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c index d2414df60d7a..33f168836370 100644 --- a/sys/kern/kern_proc.c +++ b/sys/kern/kern_proc.c @@ -2505,7 +2505,7 @@ kern_proc_vmmap_out(struct proc *p, struct sbuf *sb, ssize_t maxlen, int flags) vm_map_entry_t entry, tmp_entry; struct vattr va; vm_map_t map; - vm_object_t obj, tobj, lobj; + vm_object_t lobj, nobj, obj, tobj; char *fullpath, *freepath; struct kinfo_vmentry *kve; struct ucred *cred; @@ -2554,8 +2554,8 @@ kern_proc_vmmap_out(struct proc *p, struct sbuf *sb, ssize_t maxlen, int flags) &kve->kve_resident, &super); if (super) kve->kve_flags |= KVME_FLAG_SUPER; - for (tobj = obj; tobj != NULL; - tobj = tobj->backing_object) { + for (tobj = obj; tobj != NULL; tobj = nobj) { + nobj = tobj->backing_object; if (tobj != obj && tobj != lobj) VM_OBJECT_RUNLOCK(tobj); } _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
