Messages in this thread | | | From | Alexandre Ghiti <> | Subject | [PATCH v6 0/2] Map the kernel with correct permissions the first time | Date | Thu, 17 Jun 2021 15:17:32 +0200 |
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The kernel permissions are fixed after the kernel page table is created: avoid that by mapping the kernel 'correctly' the first time.
Patch 1 introduces a new helper to set kernel mapping permissions while avoiding all the casts when using set_memory_* API.
Patch 2 is the bulk of this work and deals with mapping the kernel with the right permissions.
Changes in v6: * load_sz was placed in init section but is now used in kernel address conversions macros, so remove this attribute.
Changes in v5: * Remove non-relevant commits to this patchset that raised issues * Make load_sz non-static as it is used in kernel address conversions macros * Rebased on top for-next
Changes in v4: * Add patch 1 as noted by Jisheng * Changes patch 2 title as suggested by Anup * Add Reviewed-by from Anup
Changes in v3: * Add a patch that factorizes kernel address conversions * Add a helper called set_kernel_memory in its own patch, as suggested by Christoph * Prefer IS_ENABLED over #ifdef, as suggested by Christoph * Split overly long lines, as suggested by Christoph * Simplify kernel mapping by mapping ALL text as readonly and taking advantage of already present code that enables write for init text before free_initmem_default.
Changes in v2: * Rebased on top of for-next (and "riscv: mm: fix build errors caused by mk_pmd()") * Get rid of protect_kernel_linear_mapping_text_rodata as suggested by Jisheng * Improve code in general compared to previous RFC
Alexandre Ghiti (2): riscv: Introduce set_kernel_memory helper riscv: Map the kernel with correct permissions the first time
arch/riscv/include/asm/page.h | 13 +++- arch/riscv/include/asm/sections.h | 17 +++++ arch/riscv/include/asm/set_memory.h | 13 ++-- arch/riscv/kernel/setup.c | 11 +-- arch/riscv/mm/init.c | 108 ++++++++++++---------------- arch/riscv/mm/pageattr.c | 10 +++ 6 files changed, 91 insertions(+), 81 deletions(-)
-- 2.30.2
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