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riscv: virt_addr_valid must check the address belongs to linear mapping 

[ Upstream commit 2ab5438233 ]

virt_addr_valid macro checks that a virtual address is valid, ie that
the address belongs to the linear mapping and that the corresponding
 physical page exists.

Add the missing check that ensures the virtual address belongs to the
linear mapping, otherwise __virt_to_phys, when compiled with
CONFIG_DEBUG_VIRTUAL enabled, raises a WARN that is interpreted as a
kernel bug by syzbot.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexandre Ghiti 2021-01-29 12:31:05 -05:00 committed by Greg Kroah-Hartman
parent 8ac2adcc95
commit 996344d9fc
1 changed files with 4 additions and 1 deletions
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5
arch/riscv/include/asm/page.h
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@ -115,7 +115,10 @@ extern unsigned long min_low_pfn;
#endif /* __ASSEMBLY__ */
#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
#define virt_addr_valid(vaddr) ({ \
unsigned long _addr = (unsigned long)vaddr; \
(unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
})
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)