From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v3 09/10] powerpc/fsl_booke: Update of TLBCAMs after init
Date: Mon, 25 Oct 2021 23:44:21 +0200 [thread overview]
Message-ID: <c7d2f279533fcba0c66801d1bb6528b96c39ecfd.1635198209.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <f34898e2edb21db1bcb1c9a96ac7433a141d50c2.1635198209.git.christophe.leroy@csgroup.eu>
After init, set readonly memory as ROX and set readwrite
memory as RWX, if STRICT_KERNEL_RWX is enabled.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
v3: No change
v2: No change
---
arch/powerpc/mm/mmu_decl.h | 2 +-
arch/powerpc/mm/nohash/fsl_book3e.c | 32 +++++++++++++++++++++++++----
2 files changed, 29 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index e13a3c0caa02..0dd4c18f8363 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -168,7 +168,7 @@ static inline phys_addr_t v_block_mapped(unsigned long va) { return 0; }
static inline unsigned long p_block_mapped(phys_addr_t pa) { return 0; }
#endif
-#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_PPC_8xx)
+#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC_FSL_BOOK3E)
void mmu_mark_initmem_nx(void);
void mmu_mark_rodata_ro(void);
#else
diff --git a/arch/powerpc/mm/nohash/fsl_book3e.c b/arch/powerpc/mm/nohash/fsl_book3e.c
index 88132cab3442..b231a54f540c 100644
--- a/arch/powerpc/mm/nohash/fsl_book3e.c
+++ b/arch/powerpc/mm/nohash/fsl_book3e.c
@@ -182,7 +182,7 @@ static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt,
/* Calculate CAM values */
for (i = 0; boundary && i < max_cam_idx; i++) {
unsigned long cam_sz;
- pgprot_t prot = PAGE_KERNEL_X;
+ pgprot_t prot = init ? PAGE_KERNEL_X : PAGE_KERNEL_ROX;
cam_sz = calc_cam_sz(boundary, virt, phys);
if (!dryrun)
@@ -195,7 +195,7 @@ static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt,
}
for (ram -= amount_mapped; ram && i < max_cam_idx; i++) {
unsigned long cam_sz;
- pgprot_t prot = PAGE_KERNEL_X;
+ pgprot_t prot = init ? PAGE_KERNEL_X : PAGE_KERNEL;
cam_sz = calc_cam_sz(ram, virt, phys);
if (!dryrun)
@@ -210,8 +210,13 @@ static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt,
if (dryrun)
return amount_mapped;
- loadcam_multi(0, i, max_cam_idx);
- tlbcam_index = i;
+ if (init) {
+ loadcam_multi(0, i, max_cam_idx);
+ tlbcam_index = i;
+ } else {
+ loadcam_multi(0, i, 0);
+ WARN_ON(i > tlbcam_index);
+ }
#ifdef CONFIG_PPC64
get_paca()->tcd.esel_next = i;
@@ -280,6 +285,25 @@ void __init adjust_total_lowmem(void)
memblock_set_current_limit(memstart_addr + __max_low_memory);
}
+#ifdef CONFIG_STRICT_KERNEL_RWX
+void mmu_mark_rodata_ro(void)
+{
+ /* Everything is done in mmu_mark_initmem_nx() */
+}
+#endif
+
+void mmu_mark_initmem_nx(void)
+{
+ unsigned long remapped;
+
+ if (!strict_kernel_rwx_enabled())
+ return;
+
+ remapped = map_mem_in_cams(__max_low_memory, CONFIG_LOWMEM_CAM_NUM, false, false);
+
+ WARN_ON(__max_low_memory != remapped);
+}
+
void setup_initial_memory_limit(phys_addr_t first_memblock_base,
phys_addr_t first_memblock_size)
{
--
2.31.1
next prev parent reply other threads:[~2021-10-25 21:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-25 21:44 [PATCH v3 01/10] powerpc/nohash: Fix __ptep_set_access_flags() and ptep_set_wrprotect() Christophe Leroy
2021-10-25 21:44 ` [PATCH v3 02/10] powerpc/book3e: Fix set_memory_x() and set_memory_nx() Christophe Leroy
2021-10-25 21:44 ` [PATCH v3 03/10] powerpc/booke: Disable STRICT_KERNEL_RWX, DEBUG_PAGEALLOC and KFENCE Christophe Leroy
2021-10-25 21:44 ` [PATCH v3 04/10] powerpc/fsl_booke: Rename fsl_booke.c to fsl_book3e.c Christophe Leroy
2021-10-25 21:44 ` [PATCH v3 05/10] powerpc/fsl_booke: Take exec flag into account when setting TLBCAMs Christophe Leroy
2021-10-25 21:44 ` [PATCH v3 06/10] powerpc/fsl_booke: Enable reloading of TLBCAM without switching to AS1 Christophe Leroy
2021-10-25 21:44 ` [PATCH v3 07/10] powerpc/fsl_booke: Tell map_mem_in_cams() if init is done Christophe Leroy
2021-10-25 21:44 ` [PATCH v3 08/10] powerpc/fsl_booke: Allocate separate TLBCAMs for readonly memory Christophe Leroy
2021-10-25 21:44 ` Christophe Leroy [this message]
2021-10-25 21:44 ` [PATCH v3 10/10] powerpc/fsl_booke: Enable STRICT_KERNEL_RWX Christophe Leroy
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