From: tip-bot for Tetsuo Handa <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: tglx@linutronix.de, penguin-kernel@I-love.SAKURA.ne.jp,
mingo@kernel.org, bhe@redhat.com, ying.huang@intel.com,
hpa@zytor.com, linux-kernel@vger.kernel.org,
syzbot+d96f60296ef613fe1d69@syzkaller.appspotmail.com
Subject: [tip:x86/urgent] x86/kexec: Avoid double free_page() upon do_kexec_load() failure
Date: Sun, 13 May 2018 10:54:45 -0700 [thread overview]
Message-ID: <tip-a466ef76b815b86748d9870ef2a430af7b39c710@git.kernel.org> (raw)
In-Reply-To: <201805091942.DGG12448.tMFVFSJFQOOLHO@I-love.SAKURA.ne.jp>
Commit-ID: a466ef76b815b86748d9870ef2a430af7b39c710
Gitweb: https://git.kernel.org/tip/a466ef76b815b86748d9870ef2a430af7b39c710
Author: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
AuthorDate: Wed, 9 May 2018 19:42:20 +0900
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Sun, 13 May 2018 19:50:06 +0200
x86/kexec: Avoid double free_page() upon do_kexec_load() failure
>From ff82bedd3e12f0d3353282054ae48c3bd8c72012 Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Wed, 9 May 2018 12:12:39 +0900
Subject: [PATCH v3] x86/kexec: avoid double free_page() upon do_kexec_load() failure.
syzbot is reporting crashes after memory allocation failure inside
do_kexec_load() [1]. This is because free_transition_pgtable() is called
by both init_transition_pgtable() and machine_kexec_cleanup() when memory
allocation failed inside init_transition_pgtable().
Regarding 32bit code, machine_kexec_free_page_tables() is called by both
machine_kexec_alloc_page_tables() and machine_kexec_cleanup() when memory
allocation failed inside machine_kexec_alloc_page_tables().
Fix this by leaving the error handling to machine_kexec_cleanup()
(and optionally setting NULL after free_page()).
[1] https://syzkaller.appspot.com/bug?id=91e52396168cf2bdd572fe1e1bc0bc645c1c6b40
Fixes: f5deb79679af6eb4 ("x86: kexec: Use one page table in x86_64 machine_kexec")
Fixes: 92be3d6bdf2cb349 ("kexec/i386: allocate page table pages dynamically")
Reported-by: syzbot <syzbot+d96f60296ef613fe1d69@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: thomas.lendacky@amd.com
Cc: prudo@linux.vnet.ibm.com
Cc: Huang Ying <ying.huang@intel.com>
Cc: syzkaller-bugs@googlegroups.com
Cc: takahiro.akashi@linaro.org
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: akpm@linux-foundation.org
Cc: dyoung@redhat.com
Cc: kirill.shutemov@linux.intel.com
Link: https://lkml.kernel.org/r/201805091942.DGG12448.tMFVFSJFQOOLHO@I-love.SAKURA.ne.jp
---
arch/x86/kernel/machine_kexec_32.c | 6 +++++-
arch/x86/kernel/machine_kexec_64.c | 5 ++++-
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c
index 60cdec6628b0..d1ab07ec8c9a 100644
--- a/arch/x86/kernel/machine_kexec_32.c
+++ b/arch/x86/kernel/machine_kexec_32.c
@@ -57,12 +57,17 @@ static void load_segments(void)
static void machine_kexec_free_page_tables(struct kimage *image)
{
free_page((unsigned long)image->arch.pgd);
+ image->arch.pgd = NULL;
#ifdef CONFIG_X86_PAE
free_page((unsigned long)image->arch.pmd0);
+ image->arch.pmd0 = NULL;
free_page((unsigned long)image->arch.pmd1);
+ image->arch.pmd1 = NULL;
#endif
free_page((unsigned long)image->arch.pte0);
+ image->arch.pte0 = NULL;
free_page((unsigned long)image->arch.pte1);
+ image->arch.pte1 = NULL;
}
static int machine_kexec_alloc_page_tables(struct kimage *image)
@@ -79,7 +84,6 @@ static int machine_kexec_alloc_page_tables(struct kimage *image)
!image->arch.pmd0 || !image->arch.pmd1 ||
#endif
!image->arch.pte0 || !image->arch.pte1) {
- machine_kexec_free_page_tables(image);
return -ENOMEM;
}
return 0;
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index a5e55d832d0a..6010449ca6d2 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -39,9 +39,13 @@ const struct kexec_file_ops * const kexec_file_loaders[] = {
static void free_transition_pgtable(struct kimage *image)
{
free_page((unsigned long)image->arch.p4d);
+ image->arch.p4d = NULL;
free_page((unsigned long)image->arch.pud);
+ image->arch.pud = NULL;
free_page((unsigned long)image->arch.pmd);
+ image->arch.pmd = NULL;
free_page((unsigned long)image->arch.pte);
+ image->arch.pte = NULL;
}
static int init_transition_pgtable(struct kimage *image, pgd_t *pgd)
@@ -91,7 +95,6 @@ static int init_transition_pgtable(struct kimage *image, pgd_t *pgd)
set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC_NOENC));
return 0;
err:
- free_transition_pgtable(image);
return result;
}
next prev parent reply other threads:[~2018-05-13 17:55 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-01 8:31 kernel BUG at include/linux/mm.h:LINE! syzbot
2018-05-01 10:10 ` Tetsuo Handa
2018-05-04 0:32 ` Baoquan He
2018-05-08 11:26 ` [PATCH v2] x86/kexec: avoid double free_page() upon do_kexec_load() failure Tetsuo Handa
2018-05-09 10:42 ` [PATCH v3] " Tetsuo Handa
2018-05-10 6:39 ` Baoquan He
2018-05-13 17:54 ` tip-bot for Tetsuo Handa [this message]
2018-05-03 21:04 ` kernel BUG at include/linux/mm.h:LINE! syzbot
2018-05-03 23:38 ` [PATCH v2] x86/kexec: avoid double free_page() upon do_kexec_load() failure Tetsuo Handa
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