From: Josh Poimboeuf <jpoimboe@redhat.com>
To: live-patching@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Jessica Yu <jeyu@kernel.org>, Miroslav Benes <mbenes@suse.cz>
Subject: [PATCH v2 1/9] livepatch: Disallow vmlinux.ko
Date: Fri, 17 Apr 2020 09:04:26 -0500 [thread overview]
Message-ID: <68b2d27ce7991873ae3932e0f8f3f05c44dbc4f8.1587131959.git.jpoimboe@redhat.com> (raw)
In-Reply-To: <cover.1587131959.git.jpoimboe@redhat.com>
This is purely a theoretical issue, but if there were a module named
vmlinux.ko, the livepatch relocation code wouldn't be able to
distinguish between vmlinux-specific and vmlinux.o-specific KLP
relocations.
If CONFIG_LIVEPATCH is enabled, don't allow a module named vmlinux.ko.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
kernel/livepatch/core.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index c3512e7e0801..40cfac8156fd 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -1139,6 +1139,11 @@ int klp_module_coming(struct module *mod)
if (WARN_ON(mod->state != MODULE_STATE_COMING))
return -EINVAL;
+ if (!strcmp(mod->name, "vmlinux")) {
+ pr_err("vmlinux.ko: invalid module name");
+ return -EINVAL;
+ }
+
mutex_lock(&klp_mutex);
/*
* Each module has to know that klp_module_coming()
--
2.21.1
next prev parent reply other threads:[~2020-04-17 14:04 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-17 14:04 [PATCH v2 0/9] livepatch,module: Remove .klp.arch and module_disable_ro() Josh Poimboeuf
2020-04-17 14:04 ` Josh Poimboeuf [this message]
2020-04-17 14:04 ` [PATCH v2 2/9] livepatch: Apply vmlinux-specific KLP relocations early Josh Poimboeuf
2020-04-20 17:57 ` Joe Lawrence
2020-04-20 18:25 ` Josh Poimboeuf
2020-04-20 19:01 ` Joe Lawrence
2020-04-20 19:11 ` Josh Poimboeuf
2020-04-20 19:49 ` Joe Lawrence
2020-04-20 19:51 ` Josh Poimboeuf
2020-04-23 1:10 ` Joe Lawrence
2020-04-21 11:54 ` Miroslav Benes
2020-04-17 14:04 ` [PATCH v2 3/9] livepatch: Remove .klp.arch Josh Poimboeuf
2020-04-17 14:04 ` [PATCH v2 4/9] livepatch: Prevent module-specific KLP rela sections from referencing vmlinux symbols Josh Poimboeuf
2020-04-17 14:04 ` [PATCH v2 5/9] s390: Change s390_kernel_write() return type to match memcpy() Josh Poimboeuf
2020-04-17 14:04 ` [PATCH v2 6/9] s390/module: Use s390_kernel_write() for late relocations Josh Poimboeuf
2020-04-22 12:28 ` Miroslav Benes
2020-04-24 13:43 ` Josh Poimboeuf
2020-04-22 14:40 ` Gerald Schaefer
2020-04-22 15:21 ` Gerald Schaefer
2020-04-22 19:46 ` Josh Poimboeuf
2020-04-23 12:33 ` Gerald Schaefer
2020-04-23 13:22 ` Miroslav Benes
2020-04-23 14:12 ` Josh Poimboeuf
2020-04-23 18:10 ` Josh Poimboeuf
2020-04-23 23:26 ` Josh Poimboeuf
2020-04-24 2:35 ` Joe Lawrence
2020-04-24 4:12 ` Josh Poimboeuf
2020-04-24 7:20 ` Christian Borntraeger
2020-04-24 13:37 ` Josh Poimboeuf
2020-04-30 14:38 ` Joe Lawrence
2020-04-30 16:48 ` Josh Poimboeuf
2020-04-30 17:04 ` Joe Lawrence
2020-04-23 14:21 ` Joe Lawrence
2020-04-17 14:04 ` [PATCH v2 7/9] x86/module: Use text_poke() " Josh Poimboeuf
2020-04-17 14:29 ` Peter Zijlstra
2020-04-17 14:51 ` Josh Poimboeuf
2020-04-17 14:04 ` [PATCH v2 8/9] livepatch: Remove module_disable_ro() usage Josh Poimboeuf
2020-04-17 14:04 ` [PATCH v2 9/9] module: Remove module_disable_ro() Josh Poimboeuf
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