From: Jason Yan <yanaijie@huawei.com>
To: <mpe@ellerman.id.au>, <linuxppc-dev@lists.ozlabs.org>,
<diana.craciun@nxp.com>, <christophe.leroy@c-s.fr>,
<benh@kernel.crashing.org>, <paulus@samba.org>,
<npiggin@gmail.com>, <keescook@chromium.org>,
<kernel-hardening@lists.openwall.com>
Cc: <linux-kernel@vger.kernel.org>, <wangkefeng.wang@huawei.com>,
<yebin10@huawei.com>, <thunder.leizhen@huawei.com>,
<jingxiangfeng@huawei.com>, <fanchengyang@huawei.com>,
<zhaohongjiang@huawei.com>, Jason Yan <yanaijie@huawei.com>
Subject: [PATCH v3 09/10] powerpc/fsl_booke/kaslr: support nokaslr cmdline parameter
Date: Wed, 31 Jul 2019 17:43:17 +0800 [thread overview]
Message-ID: <20190731094318.26538-10-yanaijie@huawei.com> (raw)
In-Reply-To: <20190731094318.26538-1-yanaijie@huawei.com>
One may want to disable kaslr when boot, so provide a cmdline parameter
'nokaslr' to support this.
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Cc: Diana Craciun <diana.craciun@nxp.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
---
arch/powerpc/kernel/kaslr_booke.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/arch/powerpc/kernel/kaslr_booke.c b/arch/powerpc/kernel/kaslr_booke.c
index 4b3f19a663fc..7c3cb41e7122 100644
--- a/arch/powerpc/kernel/kaslr_booke.c
+++ b/arch/powerpc/kernel/kaslr_booke.c
@@ -361,6 +361,18 @@ static unsigned long __init kaslr_choose_location(void *dt_ptr, phys_addr_t size
return kaslr_offset;
}
+static inline __init bool kaslr_disabled(void)
+{
+ char *str;
+
+ str = strstr(boot_command_line, "nokaslr");
+ if ((str == boot_command_line) ||
+ (str > boot_command_line && *(str - 1) == ' '))
+ return true;
+
+ return false;
+}
+
/*
* To see if we need to relocate the kernel to a random offset
* void *dt_ptr - address of the device tree
@@ -376,6 +388,8 @@ notrace void __init kaslr_early_init(void *dt_ptr, phys_addr_t size)
kernel_sz = (unsigned long)_end - KERNELBASE;
kaslr_get_cmdline(dt_ptr);
+ if (kaslr_disabled())
+ return;
offset = kaslr_choose_location(dt_ptr, size, kernel_sz);
--
2.17.2
next prev parent reply other threads:[~2019-07-31 9:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-31 9:43 [PATCH v3 00/10] implement KASLR for powerpc/fsl_booke/32 Jason Yan
2019-07-31 9:43 ` [PATCH v3 01/10] powerpc: unify definition of M_IF_NEEDED Jason Yan
2019-07-31 9:43 ` [PATCH v3 02/10] powerpc: move memstart_addr and kernstart_addr to init-common.c Jason Yan
2019-07-31 9:43 ` [PATCH v3 03/10] powerpc: introduce kimage_vaddr to store the kernel base Jason Yan
2019-07-31 9:43 ` [PATCH v3 04/10] powerpc/fsl_booke/32: introduce create_tlb_entry() helper Jason Yan
2019-07-31 9:43 ` [PATCH v3 05/10] powerpc/fsl_booke/32: introduce reloc_kernel_entry() helper Jason Yan
2019-07-31 9:43 ` [PATCH v3 06/10] powerpc/fsl_booke/32: implement KASLR infrastructure Jason Yan
2019-08-02 8:41 ` Diana Madalina Craciun
2019-08-05 5:40 ` Jason Yan
2019-07-31 9:43 ` [PATCH v3 07/10] powerpc/fsl_booke/32: randomize the kernel image offset Jason Yan
2019-07-31 9:43 ` [PATCH v3 08/10] powerpc/fsl_booke/kaslr: clear the original kernel if randomized Jason Yan
2019-07-31 9:43 ` Jason Yan [this message]
2019-07-31 9:43 ` [PATCH v3 10/10] powerpc/fsl_booke/kaslr: dump out kernel offset information on panic Jason Yan
2019-08-01 14:36 ` [PATCH v3 00/10] implement KASLR for powerpc/fsl_booke/32 Diana Madalina Craciun
2019-08-02 0:48 ` Jason Yan
2019-08-02 8:48 ` Diana Madalina Craciun
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