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Date: Thu, 11 Oct 2018 16:31:12 -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,
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mingo@...hat.com,
bp@...en8.de,
x86@...nel.org,
arnd@...db.de,
jeyu@...nel.org,
linux-arm-kernel@...ts.infradead.org,
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linux-mips@...ux-mips.org,
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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 2/7] x86/modules: Add rlimit checking for x86 modules
This adds in the rlimit checking for the x86 module allocator.
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
arch/x86/include/asm/pgtable_32_types.h | 3 +++
arch/x86/include/asm/pgtable_64_types.h | 2 ++
arch/x86/kernel/module.c | 7 ++++++-
3 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h
index b0bc0fff5f1f..185e382fa8c3 100644
--- a/arch/x86/include/asm/pgtable_32_types.h
+++ b/arch/x86/include/asm/pgtable_32_types.h
@@ -68,6 +68,9 @@ extern bool __vmalloc_start_set; /* set once high_memory is set */
#define MODULES_END VMALLOC_END
#define MODULES_LEN (MODULES_VADDR - MODULES_END)
+/* Half of 128MB vmalloc space */
+#define MODSPACE_LIMIT (1 << 25)
+
#define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
#endif /* _ASM_X86_PGTABLE_32_DEFS_H */
diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index 04edd2d58211..c256931f4667 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -143,6 +143,8 @@ extern unsigned int ptrs_per_p4d;
#define MODULES_END _AC(0xffffffffff000000, UL)
#define MODULES_LEN (MODULES_END - MODULES_VADDR)
+#define MODSPACE_LIMIT (MODULES_LEN / 2)
+
#define ESPFIX_PGD_ENTRY _AC(-2, UL)
#define ESPFIX_BASE_ADDR (ESPFIX_PGD_ENTRY << P4D_SHIFT)
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index f58336af095c..5eb3f9c5a976 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -84,16 +84,21 @@ void *module_alloc(unsigned long size)
if (PAGE_ALIGN(size) > MODULES_LEN)
return NULL;
+ if (check_inc_mod_rlimit(size))
+ return NULL;
+
p = __vmalloc_node_range(size, MODULE_ALIGN,
MODULES_VADDR + get_module_load_offset(),
MODULES_END, GFP_KERNEL,
PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
__builtin_return_address(0));
if (p && (kasan_module_alloc(p, size) < 0)) {
- vfree(p);
+ module_memfree(p);
return NULL;
}
+ update_mod_rlimit(p, size);
+
return p;
}
--
2.17.1
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