From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linuxfoundation.org>,
x86@kernel.org, Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Borislav Petkov <bp@alien8.de>,
Dominik Brodowski <linux@dominikbrodowski.net>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: [patch 1/3] x86/ldt: Free the right LDT memory in write_ldt() error path
Date: Sat, 30 Dec 2017 22:13:52 +0100 [thread overview]
Message-ID: <20171230211829.508293470@linutronix.de> (raw)
In-Reply-To: 20171230211351.980176980@linutronix.de
[-- Attachment #1: x86-ldt--Free-the-right-thing-in-error-path.patch --]
[-- Type: text/plain, Size: 693 bytes --]
The error path in write_ldt() frees the already installed LDT memory
instead of the newly allocated which cannot be installed.
Fixes: f55f0501cbf6 ("x86/pti: Put the LDT in its own PGD if PTI is on")
Reported-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/ldt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -421,7 +421,7 @@ static int write_ldt(void __user *ptr, u
*/
error = map_ldt_struct(mm, new_ldt, old_ldt ? !old_ldt->slot : 0);
if (error) {
- free_ldt_struct(old_ldt);
+ free_ldt_struct(new_ldt);
goto out_unlock;
}
next prev parent reply other threads:[~2017-12-30 21:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-30 21:13 [patch 0/3] x86/pti: Fix various fallout Thomas Gleixner
2017-12-30 21:13 ` Thomas Gleixner [this message]
2017-12-30 21:33 ` [patch 1/3] x86/ldt: Free the right LDT memory in write_ldt() error path Ingo Molnar
2017-12-31 10:24 ` [patch V2 1/3] x86/ldt: Plug memory leak in " Thomas Gleixner
2017-12-31 15:23 ` Andy Lutomirski
2017-12-30 21:13 ` [patch 2/3] x86/smpboot: Remove stale tlb flush invocations Thomas Gleixner
2017-12-30 21:32 ` Ingo Molnar
2017-12-30 21:13 ` [patch 3/3] x86/mm: Remove preempt_disable/enable() from __native_flush_tlb() Thomas Gleixner
2017-12-30 21:31 ` Ingo Molnar
2017-12-30 21:35 ` [patch 0/3] x86/pti: Fix various fallout Ingo Molnar
2017-12-30 22:06 ` Linus Torvalds
2017-12-31 2:23 ` Andy Lutomirski
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