ARM: 9106/1: traps: use get_kernel_nofault instead of set_fs()

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ARM uses set_fs() and __get_user() to allow the stack dumping code to
access possibly invalid pointers carefully. These can be changed to the
simpler get_kernel_nofault(), and allow the eventual removal of set_fs().

dump_instr() will print either kernel or user space pointers,
depending on how it was called. For dump_mem(), I assume we are only
interested in kernel pointers, and the only time that this is called
with user_mode(regs)==true is when the regs themselves are unreliable
as a result of the condition that caused the trap.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

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Arnd Bergmann 2021-08-11 08:30:19 +01:00 • committed by Russell King (Oracle)

parent 2423de2e6f

commit 344179fc7e

1 changed files with 16 additions and 31 deletions

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arch/arm/kernel/traps.c

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