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| author |   Christoph Hellwig <hch@lst.de> | 2024-10-23 07:36:37 +0200 |
|---|---|---|
| committer |   Arnd Bergmann <arnd@arndb.de> | 2024-10-28 21:44:28 +0000 |
| commit | 3e25d5a49f99b75be2c6cfb165e4f77dc6d739a2 (patch) | |
| tree | 37b3f986f6be011bcc7d5ec4442e593a331cac74 | |
| parent | asm-generic: provide generic page_to_phys and phys_to_page implementations (diff) | |
| download | wireguard-linux-3e25d5a49f99b75be2c6cfb165e4f77dc6d739a2.tar.xz wireguard-linux-3e25d5a49f99b75be2c6cfb165e4f77dc6d739a2.zip | |
asm-generic: add an optional pfn_valid check to page_to_phys
page_to_pfn is usually implemented by pointer arithmetics on the memory
map, which means that bogus input can lead to even more bogus output.
Powerpc had a pfn_valid check on the intermediate pfn in the page_to_phys
implementation when CONFIG_DEBUG_VIRTUAL is defined, which seems
generally useful, so add that to the generic version.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to '')
| -rw-r--r-- | include/asm-generic/memory_model.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h index a73a140cbecd..6d1fb6162ac1 100644 --- a/include/asm-generic/memory_model.h +++ b/include/asm-generic/memory_model.h @@ -64,7 +64,17 @@ static inline int pfn_valid(unsigned long pfn) #define page_to_pfn __page_to_pfn #define pfn_to_page __pfn_to_page +#ifdef CONFIG_DEBUG_VIRTUAL +#define page_to_phys(page) \ +({ \ + unsigned long __pfn = page_to_pfn(page); \ + \ + WARN_ON_ONCE(!pfn_valid(__pfn)); \ + PFN_PHYS(__pfn); \ +}) +#else #define page_to_phys(page) PFN_PHYS(page_to_pfn(page)) +#endif /* CONFIG_DEBUG_VIRTUAL */ #define phys_to_page(phys) pfn_to_page(PHYS_PFN(phys)) #endif /* __ASSEMBLY__ */ |