ec6d06efb0
x86 has an option CONFIG_DEBUG_VIRTUAL to do additional checks on virt_to_phys calls. The goal is to catch users who are calling virt_to_phys on non-linear addresses immediately. This inclues callers using virt_to_phys on image addresses instead of __pa_symbol. As features such as CONFIG_VMAP_STACK get enabled for arm64, this becomes increasingly important. Add checks to catch bad virt_to_phys usage. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
31 lines
737 B
C
31 lines
737 B
C
#include <linux/bug.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/mmdebug.h>
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#include <linux/mm.h>
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#include <asm/memory.h>
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phys_addr_t __virt_to_phys(unsigned long x)
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{
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WARN(!__is_lm_address(x),
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"virt_to_phys used for non-linear address: %pK (%pS)\n",
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(void *)x,
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(void *)x);
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return __virt_to_phys_nodebug(x);
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}
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EXPORT_SYMBOL(__virt_to_phys);
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phys_addr_t __phys_addr_symbol(unsigned long x)
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{
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/*
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* This is bounds checking against the kernel image only.
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* __pa_symbol should only be used on kernel symbol addresses.
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*/
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VIRTUAL_BUG_ON(x < (unsigned long) KERNEL_START ||
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x > (unsigned long) KERNEL_END);
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return __pa_symbol_nodebug(x);
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}
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EXPORT_SYMBOL(__phys_addr_symbol);
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