| 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
| ||
|
Date: Fri, 9 Apr 2010 08:43:55 +0800
From: Liang Li <liang.li@...driver.com>
To: linux-kernel@...r.kernel.org
Cc: wangchen@...fujitsu.com, mingo@...e.hu, tglx@...utronix.de,
hpa@...or.com, yinghai@...nel.org, akpm@...ux-foundation.org,
jeremy.fitzhardinge@...rix.com, konrad.wilk@...cle.com
Subject: [PATCH v3] x86: let 'reservetop' functioning right
When specify 'reservetop=0xbadc0de' kernel parameter, the kernel will
stop booting due to a early_ioremap bug that relate to commit 8827247ff.
The root cause of boot failure problem is the value of 'slot_virt[i]'
was initialized in setup_arch->early_ioremap_init. But later in
setup_arch, the function 'parse_early_param' will modify 'FIXADDR_TOP'
when 'reservetop=0xbadc0de' being specified.
The simplest fix might be use __fix_to_virt(idx0) to get updated value
of 'FIXADDR_TOP' in '__early_ioremap' instead of reference old value
from slot_virt[slot] directly.
Changelog since v0:
-v1: When reservetop being handled then FIXADDR_TOP get adjusted, Hence
check prev_map then re-initialize slot_virt and PMD based on new
FIXADDR_TOP.
-v2: place fixup_early_ioremap hence call early_ioremap_init in
reserve_top_address to re-initialize slot_virt and corresponding PMD
when parse_reservetop
-v3: move fixup_early_ioremap out of reserve_top_address to make sure
other clients of reserve_top_address like xen/lguest won't broken
Signed-off-by: Liang Li <liang.li@...driver.com>
Cc: Wang Chen <wangchen@...fujitsu.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
arch/x86/include/asm/io.h | 1 +
arch/x86/mm/ioremap.c | 15 +++++++++++++++
arch/x86/mm/pgtable_32.c | 1 +
3 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index a1dcfa3..30a3e97 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -347,6 +347,7 @@ extern void __iomem *early_ioremap(resource_size_t phys_addr,
extern void __iomem *early_memremap(resource_size_t phys_addr,
unsigned long size);
extern void early_iounmap(void __iomem *addr, unsigned long size);
+extern void fixup_early_ioremap(void);
#define IO_SPACE_LIMIT 0xffff
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 5eb1ba7..e4ab706 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -448,6 +448,21 @@ static inline void __init early_clear_fixmap(enum fixed_addresses idx)
static void __iomem *prev_map[FIX_BTMAPS_SLOTS] __initdata;
static unsigned long prev_size[FIX_BTMAPS_SLOTS] __initdata;
+void __init fixup_early_ioremap(void)
+{
+ int i;
+ for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
+ if (prev_map[i])
+ break;
+ }
+
+ if (i < FIX_BTMAPS_SLOTS)
+ BUG_ON(1);
+
+ early_ioremap_init();
+ return;
+}
+
static int __init check_early_ioremap_leak(void)
{
int count = 0;
diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c
index 1a8faf0..26eadaa 100644
--- a/arch/x86/mm/pgtable_32.c
+++ b/arch/x86/mm/pgtable_32.c
@@ -128,6 +128,7 @@ static int __init parse_reservetop(char *arg)
address = memparse(arg, &arg);
reserve_top_address(address);
+ fixup_early_ioremap();
return 0;
}
early_param("reservetop", parse_reservetop);
--
1.6.6
--
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/
Powered by blists - more mailing lists