Arnd Bergmann 12700c17fc
uaccess: generalize access_ok() ...
There are many different ways that access_ok() is defined across
architectures, but in the end, they all just compare against the
user_addr_max() value or they accept anything.
Provide one definition that works for most architectures, checking
against TASK_SIZE_MAX for user processes or skipping the check inside
of uaccess_kernel() sections.
For architectures without CONFIG_SET_FS(), this should be the fastest
check, as it comes down to a single comparison of a pointer against a
compile-time constant, while the architecture specific versions tend to
do something more complex for historic reasons or get something wrong.
Type checking for __user annotations is handled inconsistently across
architectures, but this is easily simplified as well by using an inline
function that takes a 'const void __user *' argument. A handful of
callers need an extra __user annotation for this.
Some architectures had trick to use 33-bit or 65-bit arithmetic on the
addresses to calculate the overflow, however this simpler version uses
fewer registers, which means it can produce better object code in the
end despite needing a second (statically predicted) branch.
Reviewed-by: Christoph Hellwig <hch@lst.de >
Acked-by: Mark Rutland <mark.rutland@arm.com > [arm64, asm-generic]
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org >
Acked-by: Stafford Horne <shorne@gmail.com >
Acked-by: Dinh Nguyen <dinguyen@kernel.org >
Signed-off-by: Arnd Bergmann <arnd@arndb.de >
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