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 05/10] powerpc/fsl_booke/32: introduce reloc_kernel_entry() helper
Date: Wed, 31 Jul 2019 17:43:13 +0800 [thread overview]
Message-ID: <20190731094318.26538-6-yanaijie@huawei.com> (raw)
In-Reply-To: <20190731094318.26538-1-yanaijie@huawei.com>
Add a new helper reloc_kernel_entry() to jump back to the start of the
new kernel. After we put the new kernel in a randomized place we can use
this new helper to enter the kernel and begin to relocate again.
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>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/head_fsl_booke.S | 13 +++++++++++++
arch/powerpc/mm/mmu_decl.h | 1 +
2 files changed, 14 insertions(+)
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 04d124fee17d..2083382dd662 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -1143,6 +1143,19 @@ _GLOBAL(create_tlb_entry)
sync
blr
+/*
+ * Return to the start of the relocated kernel and run again
+ * r3 - virtual address of fdt
+ * r4 - entry of the kernel
+ */
+_GLOBAL(reloc_kernel_entry)
+ mfmsr r7
+ rlwinm r7, r7, 0, ~(MSR_IS | MSR_DS)
+
+ mtspr SPRN_SRR0,r4
+ mtspr SPRN_SRR1,r7
+ rfi
+
/*
* Create a tlb entry with the same effective and physical address as
* the tlb entry used by the current running code. But set the TS to 1.
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index a09f89d3aa0f..804da298beb3 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -143,6 +143,7 @@ extern void adjust_total_lowmem(void);
extern int switch_to_as1(void);
extern void restore_to_as0(int esel, int offset, void *dt_ptr, int bootcpu);
void create_tlb_entry(phys_addr_t phys, unsigned long virt, int entry);
+void reloc_kernel_entry(void *fdt, int addr);
#endif
extern void loadcam_entry(unsigned int index);
extern void loadcam_multi(int first_idx, int num, int tmp_idx);
--
2.17.2
next prev parent reply other threads:[~2019-07-31 9:26 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 ` Jason Yan [this message]
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 ` [PATCH v3 09/10] powerpc/fsl_booke/kaslr: support nokaslr cmdline parameter Jason Yan
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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