diff options
author | Laura Abbott <labbott@redhat.com> | 2017-01-10 13:35:50 -0800 |
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committer | Will Deacon <will.deacon@arm.com> | 2017-01-12 15:05:39 +0000 |
commit | ec6d06efb0bac6cd92846e42d1afe5b98b57e7c2 (patch) | |
tree | a09267b07514bc3136eec83eb7a40ff4d22b2de9 /arch/arm64/mm/physaddr.c | |
parent | 2077be6783b5936c3daa838d8addbb635667927f (diff) | |
download | linux-ec6d06efb0bac6cd92846e42d1afe5b98b57e7c2.tar.bz2 |
arm64: Add support for CONFIG_DEBUG_VIRTUAL
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>
Diffstat (limited to 'arch/arm64/mm/physaddr.c')
-rw-r--r-- | arch/arm64/mm/physaddr.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm64/mm/physaddr.c b/arch/arm64/mm/physaddr.c new file mode 100644 index 000000000000..91371daf397c --- /dev/null +++ b/arch/arm64/mm/physaddr.c @@ -0,0 +1,30 @@ +#include <linux/bug.h> +#include <linux/export.h> +#include <linux/types.h> +#include <linux/mmdebug.h> +#include <linux/mm.h> + +#include <asm/memory.h> + +phys_addr_t __virt_to_phys(unsigned long x) +{ + WARN(!__is_lm_address(x), + "virt_to_phys used for non-linear address: %pK (%pS)\n", + (void *)x, + (void *)x); + + return __virt_to_phys_nodebug(x); +} +EXPORT_SYMBOL(__virt_to_phys); + +phys_addr_t __phys_addr_symbol(unsigned long x) +{ + /* + * This is bounds checking against the kernel image only. + * __pa_symbol should only be used on kernel symbol addresses. + */ + VIRTUAL_BUG_ON(x < (unsigned long) KERNEL_START || + x > (unsigned long) KERNEL_END); + return __pa_symbol_nodebug(x); +} +EXPORT_SYMBOL(__phys_addr_symbol); |