linux-kernel - [tip:x86/urgent] x86, range: fix missing merge during add range

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <tip-fbe06b7bae7c9cf6ab05168fce5ee93b2f4bae7c@git.kernel.org>
Date:	Fri, 17 May 2013 12:12:25 -0700
From:	tip-bot for Yinghai Lu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	yinghai@...nel.org, tglx@...utronix.de, hpa@...ux.intel.com,
	christian.koenig@....com
Subject: [tip:x86/urgent] x86, range: fix missing merge during add range

Commit-ID:  fbe06b7bae7c9cf6ab05168fce5ee93b2f4bae7c
Gitweb:     http://git.kernel.org/tip/fbe06b7bae7c9cf6ab05168fce5ee93b2f4bae7c
Author:     Yinghai Lu <yinghai@...nel.org>
AuthorDate: Fri, 17 May 2013 11:49:10 -0700
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Fri, 17 May 2013 11:49:10 -0700

x86, range: fix missing merge during add range

Christian found v3.9 does not work with E350 with EFI is enabled.

[    1.658832] Trying to unpack rootfs image as initramfs...
[    1.679935] BUG: unable to handle kernel paging request at ffff88006e3fd000
[    1.686940] IP: [<ffffffff813661df>] memset+0x1f/0xb0
[    1.692010] PGD 1f77067 PUD 1f7a067 PMD 61420067 PTE 0

but early memtest report all memory could be accessed without problem.

early page table is set in following sequence:
[    0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
[    0.000000] init_memory_mapping: [mem 0x6e600000-0x6e7fffff]
[    0.000000] init_memory_mapping: [mem 0x6c000000-0x6e5fffff]
[    0.000000] init_memory_mapping: [mem 0x00100000-0x6bffffff]
[    0.000000] init_memory_mapping: [mem 0x6e800000-0x6ea07fff]
but later efi_enter_virtual_mode try set mapping again wrongly.
[    0.010644] pid_max: default: 32768 minimum: 301
[    0.015302] init_memory_mapping: [mem 0x640c5000-0x6e3fcfff]
that means it fails with pfn_range_is_mapped.

It turns out that we have a bug in add_range_with_merge and it does not
merge range properly when new add one fill the hole between two exsiting
ranges. In the case when [mem 0x00100000-0x6bffffff] is the hole between
[mem 0x00000000-0x000fffff] and [mem 0x6c000000-0x6e7fffff].

Fix the add_range_with_merge by calling itself recursively.

Reported-by: "Christian König" <christian.koenig@....com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Link: http://lkml.kernel.org/r/CAE9FiQVofGoSk7q5-0irjkBxemqK729cND4hov-1QCBJDhxpgQ@mail.gmail.com
Cc: <stable@...r.kernel.org> v3.9
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 kernel/range.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/range.c b/kernel/range.c
index 071b0ab..eb911db 100644
--- a/kernel/range.c
+++ b/kernel/range.c
@@ -48,9 +48,11 @@ int add_range_with_merge(struct range *range, int az, int nr_range,
 		final_start = min(range[i].start, start);
 		final_end = max(range[i].end, end);
 
-		range[i].start = final_start;
-		range[i].end =  final_end;
-		return nr_range;
+		/* clear it and add it back for further merge */
+		range[i].start = 0;
+		range[i].end =  0;
+		return add_range_with_merge(range, az, nr_range,
+			final_start, final_end);
 	}
 
 	/* Need to add it: */
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/