linux-kernel - [PATCH] powerpc/32s: Fix is_module_segment() when MODULES

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Date:   Wed,  5 Aug 2020 15:27:28 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/32s: Fix is_module_segment() when MODULES_VADDR is
 defined

When MODULES_VADDR is defined, is_module_segment() shall check the
address against it instead of checking agains VMALLOC_START.

Fixes: 6ca055322da8 ("powerpc/32s: Use dedicated segment for modules with STRICT_KERNEL_RWX")
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/mm/book3s32/mmu.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/powerpc/mm/book3s32/mmu.c b/arch/powerpc/mm/book3s32/mmu.c
index c0162911f6cb..82ae9e06a773 100644
--- a/arch/powerpc/mm/book3s32/mmu.c
+++ b/arch/powerpc/mm/book3s32/mmu.c
@@ -191,10 +191,17 @@ static bool is_module_segment(unsigned long addr)
 {
 	if (!IS_ENABLED(CONFIG_MODULES))
 		return false;
+#ifdef MODULES_VADDR
+	if (addr < ALIGN_DOWN(MODULES_VADDR, SZ_256M))
+		return false;
+	if (addr >= ALIGN(MODULES_END, SZ_256M))
+		return false;
+#else
 	if (addr < ALIGN_DOWN(VMALLOC_START, SZ_256M))
 		return false;
 	if (addr >= ALIGN(VMALLOC_END, SZ_256M))
 		return false;
+#endif
 	return true;
 }
 
-- 
2.25.0