linux-kernel - [PATCH v6 bpf-next 3/5] vmalloc: WARN for set_vm_flush_reset

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 7 Jul 2022 15:35:44 -0700
From:   Song Liu <song@...nel.org>
To:     <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>
CC:     <daniel@...earbox.net>, <kernel-team@...com>, <x86@...nel.org>,
        <dave.hansen@...ux.intel.com>, <rick.p.edgecombe@...el.com>,
        <mcgrof@...nel.org>, Song Liu <song@...nel.org>
Subject: [PATCH v6 bpf-next 3/5] vmalloc: WARN for set_vm_flush_reset_perms() on huge pages

VM_FLUSH_RESET_PERMS is not yet ready for huge pages, add a WARN to
catch misuse soon.

Suggested-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
Signed-off-by: Song Liu <song@...nel.org>
---
 include/linux/vmalloc.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 096d48aa3437..59d3e1f3e108 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -239,6 +239,7 @@ static inline void set_vm_flush_reset_perms(void *addr)
 {
 	struct vm_struct *vm = find_vm_area(addr);
 
+	WARN_ON_ONCE(is_vm_area_hugepages(addr));
 	if (vm)
 		vm->flags |= VM_FLUSH_RESET_PERMS;
 }
-- 
2.30.2