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ANDROID: mm: add generic __va_function and __pa_function

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We use non-canonical CFI jump tables with CONFIG_CFI_CLANG, which
means the compiler replaces function address references with the
address of the function's CFI jump table entry. This results in
__pa_symbol(function), for example, returning the physical address
of the jump table entry, which can lead to address space confusion
since the jump table itself points to a virtual address.

This change adds generic definitions for __pa/va_function, which
architectures that support CFI can override.

Bug: 166220312
Change-Id: If4a162de7854547d8437bf59be03eb6d16220832
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen 2020-09-10 15:33:56 -07:00
commit a3cb7a0327
1 changed files with 8 additions and 0 deletions
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8
include/linux/mm.h
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@ -116,6 +116,14 @@ extern int mmap_rnd_compat_bits __read_mostly;
#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
#endif
#ifndef __va_function
#define __va_function(x) (x)
#endif
#ifndef __pa_function
#define __pa_function(x) __pa_symbol(x)
#endif
#ifndef page_to_virt
#define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
#endif