linux-kernel - [PATCH v3 4/5] arm64: kaslr: support randomized module area with KASAN

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Date:   Sat, 6 Feb 2021 16:35:51 +0800
From:   Lecopzer Chen <lecopzer.chen@...iatek.com>
To:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <kasan-dev@...glegroups.com>,
        <linux-arm-kernel@...ts.infradead.org>, <will@...nel.org>
CC:     <dan.j.williams@...el.com>, <aryabinin@...tuozzo.com>,
        <glider@...gle.com>, <dvyukov@...gle.com>,
        <akpm@...ux-foundation.org>, <linux-mediatek@...ts.infradead.org>,
        <yj.chiang@...iatek.com>, <catalin.marinas@....com>,
        <ardb@...nel.org>, <andreyknvl@...gle.com>, <broonie@...nel.org>,
        <linux@...ck-us.net>, <rppt@...nel.org>,
        <tyhicks@...ux.microsoft.com>, <robin.murphy@....com>,
        <vincenzo.frascino@....com>, <gustavoars@...nel.org>,
        <lecopzer@...il.com>, Lecopzer Chen <lecopzer.chen@...iatek.com>
Subject: [PATCH v3 4/5] arm64: kaslr: support randomized module area with KASAN_VMALLOC

After KASAN_VMALLOC works in arm64, we can randomize module region
into vmalloc area now.

Test:
	VMALLOC area ffffffc010000000 fffffffdf0000000

	before the patch:
		module_alloc_base/end ffffffc008b80000 ffffffc010000000
	after the patch:
		module_alloc_base/end ffffffdcf4bed000 ffffffc010000000

	And the function that insmod some modules is fine.

Suggested-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Lecopzer Chen <lecopzer.chen@...iatek.com>
---
 arch/arm64/kernel/kaslr.c  | 18 ++++++++++--------
 arch/arm64/kernel/module.c | 16 +++++++++-------
 2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c
index 1c74c45b9494..a2858058e724 100644
--- a/arch/arm64/kernel/kaslr.c
+++ b/arch/arm64/kernel/kaslr.c
@@ -161,15 +161,17 @@ u64 __init kaslr_early_init(u64 dt_phys)
 	/* use the top 16 bits to randomize the linear region */
 	memstart_offset_seed = seed >> 48;
 
-	if (IS_ENABLED(CONFIG_KASAN_GENERIC) ||
-	    IS_ENABLED(CONFIG_KASAN_SW_TAGS))
+	if (!IS_ENABLED(CONFIG_KASAN_VMALLOC) &&
+	    (IS_ENABLED(CONFIG_KASAN_GENERIC) ||
+	     IS_ENABLED(CONFIG_KASAN_SW_TAGS)))
 		/*
-		 * KASAN does not expect the module region to intersect the
-		 * vmalloc region, since shadow memory is allocated for each
-		 * module at load time, whereas the vmalloc region is shadowed
-		 * by KASAN zero pages. So keep modules out of the vmalloc
-		 * region if KASAN is enabled, and put the kernel well within
-		 * 4 GB of the module region.
+		 * KASAN without KASAN_VMALLOC does not expect the module region
+		 * to intersect the vmalloc region, since shadow memory is
+		 * allocated for each module at load time, whereas the vmalloc
+		 * region is shadowed by KASAN zero pages. So keep modules
+		 * out of the vmalloc region if KASAN is enabled without
+		 * KASAN_VMALLOC, and put the kernel well within 4 GB of the
+		 * module region.
 		 */
 		return offset % SZ_2G;
 
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
index fe21e0f06492..b5ec010c481f 100644
--- a/arch/arm64/kernel/module.c
+++ b/arch/arm64/kernel/module.c
@@ -40,14 +40,16 @@ void *module_alloc(unsigned long size)
 				NUMA_NO_NODE, __builtin_return_address(0));
 
 	if (!p && IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) &&
-	    !IS_ENABLED(CONFIG_KASAN_GENERIC) &&
-	    !IS_ENABLED(CONFIG_KASAN_SW_TAGS))
+	    (IS_ENABLED(CONFIG_KASAN_VMALLOC) ||
+	     (!IS_ENABLED(CONFIG_KASAN_GENERIC) &&
+	      !IS_ENABLED(CONFIG_KASAN_SW_TAGS))))
 		/*
-		 * KASAN can only deal with module allocations being served
-		 * from the reserved module region, since the remainder of
-		 * the vmalloc region is already backed by zero shadow pages,
-		 * and punching holes into it is non-trivial. Since the module
-		 * region is not randomized when KASAN is enabled, it is even
+		 * KASAN without KASAN_VMALLOC can only deal with module
+		 * allocations being served from the reserved module region,
+		 * since the remainder of the vmalloc region is already
+		 * backed by zero shadow pages, and punching holes into it
+		 * is non-trivial. Since the module region is not randomized
+		 * when KASAN is enabled without KASAN_VMALLOC, it is even
 		 * less likely that the module region gets exhausted, so we
 		 * can simply omit this fallback in that case.
 		 */
-- 
2.25.1