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>, <oss@buserror.net>,
Jason Yan <yanaijie@huawei.com>
Subject: [PATCH 2/6] powerpc/fsl_booke/64: introduce reloc_kernel_entry() helper
Date: Fri, 15 Nov 2019 17:32:05 +0800 [thread overview]
Message-ID: <20191115093209.26434-3-yanaijie@huawei.com> (raw)
In-Reply-To: <20191115093209.26434-1-yanaijie@huawei.com>
Like the 32bit code, we introduce reloc_kernel_entry() helper to prepare
for the KASLR 64bit version. And move the C declaration of this function
out of CONFIG_PPC32 and use long instead of int for the parameter 'addr'.
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Cc: Scott Wood <oss@buserror.net>
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/exceptions-64e.S | 13 +++++++++++++
arch/powerpc/mm/mmu_decl.h | 3 ++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index e4076e3c072d..1b9b174bee86 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -1679,3 +1679,16 @@ _GLOBAL(setup_ehv_ivors)
_GLOBAL(setup_lrat_ivor)
SET_IVOR(42, 0x340) /* LRAT Error */
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
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index 8e99649c24fc..3e1c85c7d10b 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -140,9 +140,10 @@ 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_kaslr_tlb_entry(int entry, unsigned long virt, phys_addr_t phys);
-void reloc_kernel_entry(void *fdt, int addr);
extern int is_second_reloc;
#endif
+
+void reloc_kernel_entry(void *fdt, long addr);
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:[~2019-11-15 9:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-15 9:32 [PATCH 0/6] implement KASLR for powerpc/fsl_booke/64 Jason Yan
2019-11-15 9:32 ` [PATCH 1/6] powerpc/fsl_booke/kaslr: refactor kaslr_legal_offset() and kaslr_early_init() Jason Yan
2019-11-15 9:32 ` Jason Yan [this message]
2019-11-15 9:32 ` [PATCH 3/6] powerpc/fsl_booke/64: implement KASLR for fsl_booke64 Jason Yan
2019-11-15 9:32 ` [PATCH 4/6] powerpc/fsl_booke/64: do not clear the BSS for the second pass Jason Yan
2019-11-15 9:32 ` [PATCH 5/6] powerpc/fsl_booke/64: clear the original kernel if randomized Jason Yan
2019-11-15 9:32 ` [PATCH 6/6] powerpc/fsl_booke/kaslr: rename kaslr-booke32.rst to kaslr-booke.rst and add 64bit part Jason Yan
2019-11-20 18:51 ` [PATCH 0/6] implement KASLR for powerpc/fsl_booke/64 Kees Cook
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