The patch below does not apply to the 6.0-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
2081b3bd0c11 ("arm64: fix rodata=full again") b9dd04a20f81 ("arm64/mm: fold check for KFENCE into can_set_direct_map()")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 2081b3bd0c11757725dcab9ba5d38e1bddb03459 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel ardb@kernel.org Date: Thu, 3 Nov 2022 18:00:15 +0100 Subject: [PATCH] arm64: fix rodata=full again
Commit 2e8cff0a0eee87b2 ("arm64: fix rodata=full") addressed a couple of issues with the rodata= kernel command line option, which is not a simple boolean on arm64, and inadvertently got broken due to changes in the generic bool handling.
Unfortunately, the resulting code never clears the rodata_full boolean variable if it defaults to true and rodata=on or rodata=off is passed, as the generic code is not aware of the existence of this variable.
Given the way this code is plumbed together, clearing rodata_full when returning false from arch_parse_debug_rodata() may result in inconsistencies if the generic code decides that it cannot parse the right hand side, so the best way to deal with this is to only take rodata_full in account if rodata_enabled is also true.
Fixes: 2e8cff0a0eee ("arm64: fix rodata=full") Cc: stable@vger.kernel.org # 6.0.x Signed-off-by: Ard Biesheuvel ardb@kernel.org Acked-by: Will Deacon will@kernel.org Link: https://lore.kernel.org/r/20221103170015.4124426-1-ardb@kernel.org Signed-off-by: Catalin Marinas catalin.marinas@arm.com
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index d107c3d434e2..5922178d7a06 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -26,7 +26,7 @@ bool can_set_direct_map(void) * mapped at page granularity, so that it is possible to * protect/unprotect single pages. */ - return rodata_full || debug_pagealloc_enabled() || + return (rodata_enabled && rodata_full) || debug_pagealloc_enabled() || IS_ENABLED(CONFIG_KFENCE); }
@@ -102,7 +102,8 @@ static int change_memory_common(unsigned long addr, int numpages, * If we are manipulating read-only permissions, apply the same * change to the linear mapping of the pages that back this VM area. */ - if (rodata_full && (pgprot_val(set_mask) == PTE_RDONLY || + if (rodata_enabled && + rodata_full && (pgprot_val(set_mask) == PTE_RDONLY || pgprot_val(clear_mask) == PTE_RDONLY)) { for (i = 0; i < area->nr_pages; i++) { __change_memory_common((u64)page_address(area->pages[i]),