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e4dace3615
Add a test module that allows testing that CONFIG_DEBUG_VIRTUAL works correctly, at least that it can catch invalid calls to virt_to_phys() against the non-linear kernel virtual address map. Link: http://lkml.kernel.org/r/20170808164035.26725-1-f.fainelli@gmail.com Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Cc: "Luis R. Rodriguez" <mcgrof@kernel.org> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
49 lines
911 B
C
49 lines
911 B
C
#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/sizes.h>
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#include <asm/page.h>
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#ifdef CONFIG_MIPS
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#include <asm/bootinfo.h>
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#endif
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struct foo {
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unsigned int bar;
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};
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struct foo *foo;
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static int __init test_debug_virtual_init(void)
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{
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phys_addr_t pa;
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void *va;
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va = (void *)VMALLOC_START;
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pa = virt_to_phys(va);
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pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
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foo = kzalloc(sizeof(*foo), GFP_KERNEL);
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if (!foo)
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return -ENOMEM;
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pa = virt_to_phys(foo);
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va = foo;
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pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
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return 0;
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}
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module_init(test_debug_virtual_init);
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static void __exit test_debug_virtual_exit(void)
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{
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kfree(foo);
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}
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module_exit(test_debug_virtual_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Test module for CONFIG_DEBUG_VIRTUAL");
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