linux-kernel - [PATCH v2 4/7] arm64/modules: Add rlimit checking for arm64 modules

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Message-Id: <20181011233117.7883-5-rick.p.edgecombe@intel.com>
Date:   Thu, 11 Oct 2018 16:31:14 -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 4/7] arm64/modules: Add rlimit checking for arm64 modules

This adds in the rlimit checking for the arm64 module allocator.

This has not been tested.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
 arch/arm64/kernel/module.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
index f0f27aeefb73..ea9794f2f571 100644
--- a/arch/arm64/kernel/module.c
+++ b/arch/arm64/kernel/module.c
@@ -39,6 +39,9 @@ void *module_alloc(unsigned long size)
 	if (IS_ENABLED(CONFIG_ARM64_MODULE_PLTS))
 		gfp_mask |= __GFP_NOWARN;
 
+	if (check_inc_mod_rlimit(size))
+		return NULL;
+
 	p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base,
 				module_alloc_base + MODULES_VSIZE,
 				gfp_mask, PAGE_KERNEL_EXEC, 0,
@@ -65,6 +68,8 @@ void *module_alloc(unsigned long size)
 		return NULL;
 	}
 
+	update_mod_rlimit(p, size);
+
 	return p;
 }
 
-- 
2.17.1