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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 <ynorov@caviumnetworks.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Yury Norov <ynorov@marvell.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Yury Norov 2018-05-16 11:18:49 +03:00 • committed by Arnd Bergmann
parent 0d0216c03a
commit 942fa985e9
23 changed files with 32 additions and 1 deletions
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2
include/linux/fcntl.h
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@ -12,7 +12,7 @@
O_NOATIME | O_CLOEXEC | O_PATH | __O_TMPFILE)
#ifndef force_o_largefile
#define force_o_largefile() (BITS_PER_LONG != 32)
#define force_o_largefile() (!IS_ENABLED(CONFIG_ARCH_32BIT_OFF_T))
#endif
#if BITS_PER_LONG == 32