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FAILED: patch "[PATCH] powerpc/kasan: Fix shadow pages allocation failure" failed to apply to 5.7-stable tree

PATCH [email protected] 1 participant 1 message Aug 10, 2020

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The patch below does not apply to the 5.7-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 <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 41ea93cf7ba4e0f0cc46ebfdda8b6ff27c67bc91 Mon Sep 17 00:00:00 2001
From: Christophe Leroy <[email protected]>
Date: Thu, 2 Jul 2020 11:52:03 +0000
Subject: [PATCH] powerpc/kasan: Fix shadow pages allocation failure

Doing kasan pages allocation in MMU_init is too early, kernel doesn't have access yet to the entire memory space and memblock_alloc() fails when the kernel is a bit big.

Do it from kasan_init() instead.

Fixes 2edb16efc899 ("powerpc/32: Add KASAN support")
Fixes d2a91cef9bbd ("powerpc/kasan: Fix shadow pages allocation failure")
Cc [email protected]
Reported-by Erhard F. <[email protected]>
Signed-off-by Christophe Leroy <[email protected]>
Signed-off-by Michael Ellerman <[email protected]>
Link https://bugzilla.kernel.org/show_bug.cgi?id=208181
Link https://lore.kernel.org/r/63048fcea8a1c02f75429ba3152f80f7853f87fc.1593690707.git.christophe.leroy@csgroup.eu open here
arch/powerpc/mm/kasan/kasan_init_32.c +13 -12
index 4813c6d50889..019b0c0bbbf3 100644
@@ -120,11 +120,24 @@ static void __init kasan_unmap_early_shadow_vmalloc(void)
 void __init kasan_mmu_init(void)
 {
 	int ret;
+
+	if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE) ||
+	    IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
+		ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, KASAN_SHADOW_END);
+
+		if (ret)
+			panic("kasan: kasan_init_shadow_page_tables() failed");
+	}
+}
+
+void __init kasan_init(void)
+{
 	struct memblock_region *reg;
 
 	for_each_memblock(memory, reg) {
 		phys_addr_t base = reg->base;
 		phys_addr_t top = min(base + reg->size, total_lowmem);
+		int ret;
 
 		if (base >= top)
 			continue;

@@ -134,18 +147,6 @@ void __init kasan_mmu_init(void)
 			panic("kasan: kasan_init_region() failed");
 	}
 
-	if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE) ||
-	    IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
-		ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, KASAN_SHADOW_END);
-
-		if (ret)
-			panic("kasan: kasan_init_shadow_page_tables() failed");
-	}
-
-}
-
-void __init kasan_init(void)
-{
 	kasan_remap_early_shadow_ro();
 
 	clear_page(kasan_early_shadow_page);