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32-bit userspace ABI: introduce ARCH_32BIT_OFF_T config option

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All new 32-bit architectures should have 64-bit userspace off_t type, but
existing architectures has 32-bit ones.

To enforce the rule, new config option is added to arch/Kconfig that defaults
ARCH_32BIT_OFF_T to be disabled for new 32-bit architectures. All existing
32-bit architectures enable it explicitly.

New option affects force_o_largefile() behaviour. Namely, if userspace
off_t is 64-bits long, we have no reason to reject user to open big files.

Note that even if architectures has only 64-bit off_t in the kernel
(arc, c6x, h8300, hexagon, nios2, openrisc, and unicore32),
a libc may use 32-bit off_t, and therefore want to limit the file size
to 4GB unless specified differently in the open flags.

Signed-off-by: Yury Norov <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Yury Norov <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
This commit is contained in:
Yury Norov 2018-05-16 11:18:49 +03:00 • committed by Arnd Bergmann
commit 942fa985e9
23 changed files with 32 additions and 1 deletions
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10
arch/Kconfig
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@ -276,6 +276,16 @@ config ARCH_THREAD_STACK_ALLOCATOR
config ARCH_WANTS_DYNAMIC_TASK_STRUCT
bool
config ARCH_32BIT_OFF_T
bool
depends on !64BIT
help
All new 32-bit architectures should have 64-bit off_t type on
userspace side which corresponds to the loff_t kernel type. This
is the requirement for modern ABIs. Some existing architectures
still support 32-bit off_t. This option is enabled for all such
architectures explicitly.
config HAVE_REGS_AND_STACK_ACCESS_API
bool
help