linux-kernel - [PATCH v2 3/7] arm/modules: Add rlimit checking for arm modules

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Date:   Thu, 11 Oct 2018 16:31:13 -0700
From:   Rick Edgecombe <rick.p.edgecombe@...el.com>
To:     kernel-hardening@...ts.openwall.com, daniel@...earbox.net,
        keescook@...omium.org, catalin.marinas@....com,
        will.deacon@....com, davem@...emloft.net, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, arnd@...db.de,
        jeyu@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-arch@...r.kernel.org
Cc:     kristen@...ux.intel.com, dave.hansen@...el.com,
        arjan@...ux.intel.com, deneen.t.dock@...el.com,
        Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: [PATCH v2 3/7] arm/modules: Add rlimit checking for arm modules

This adds in the rlimit checking for the arm module allocator.

This has not been tested.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
 arch/arm/kernel/module.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index 3ff571c2c71c..e331863553d2 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -43,6 +43,9 @@ void *module_alloc(unsigned long size)
 	gfp_t gfp_mask = GFP_KERNEL;
 	void *p;
 
+	if (check_inc_mod_rlimit(size))
+		return NULL;
+
 	/* Silence the initial allocation */
 	if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS))
 		gfp_mask |= __GFP_NOWARN;
@@ -51,10 +54,15 @@ void *module_alloc(unsigned long size)
 				gfp_mask, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
 				__builtin_return_address(0));
 	if (!IS_ENABLED(CONFIG_ARM_MODULE_PLTS) || p)
-		return p;
-	return __vmalloc_node_range(size, 1,  VMALLOC_START, VMALLOC_END,
+		goto done;
+	p = __vmalloc_node_range(size, 1,  VMALLOC_START, VMALLOC_END,
 				GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
 				__builtin_return_address(0));
+
+done:
+	update_mod_rlimit(p, size);
+
+	return p;
 }
 #endif
 
-- 
2.17.1