From: Dimitris Vlachos dvlachos@ics.forth.gr

stable inclusion from stable-v5.10.212 commit 8af1c121b0102041809bc137ec600d1865eaeedd category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9E466 CVE: CVE-2024-26795

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit a11dd49dcb9376776193e15641f84fcc1e5980c9 ]

Offset vmemmap so that the first page of vmemmap will be mapped to the first page of physical memory in order to ensure that vmemmap’s bounds will be respected during pfn_to_page()/page_to_pfn() operations. The conversion macros will produce correct SV39/48/57 addresses for every possible/valid DRAM_BASE inside the physical memory limits.

v2:Address Alex's comments

Suggested-by: Alexandre Ghiti alexghiti@rivosinc.com Signed-off-by: Dimitris Vlachos dvlachos@ics.forth.gr Reported-by: Dimitris Vlachos dvlachos@ics.forth.gr Closes: https://lore.kernel.org/linux-riscv/20240202135030.42265-1-csd4492@csd.uoc.g... Fixes: d95f1a542c3d ("RISC-V: Implement sparsemem") Reviewed-by: Alexandre Ghiti alexghiti@rivosinc.com Link: https://lore.kernel.org/r/20240229191723.32779-1-dvlachos@ics.forth.gr Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zucheng zhengzucheng@huawei.com --- arch/riscv/include/asm/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index b16304fdf448..5ab13570daa5 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -44,7 +44,7 @@ * Define vmemmap for pfn_to_page & page_to_pfn calls. Needed if kernel * is configured with CONFIG_SPARSEMEM_VMEMMAP enabled. */ -#define vmemmap ((struct page *)VMEMMAP_START) +#define vmemmap ((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT))

#define PCI_IO_SIZE SZ_16M #define PCI_IO_END VMEMMAP_START