x86/ptrace: Prevent truncation of bitmap size

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The active() callback of the IO bitmap regset divides the IO bitmap size by
the word size (32/64 bit). As the I/O bitmap size is in bytes the active
check fails for bitmap sizes of 1-3 bytes on 32bit and 1-7 bytes on 64bit.

Use DIV_ROUND_UP() instead.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Andy Lutomirski <luto@kernel.org>

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Thomas Gleixner 2019-11-11 23:03:15 +01:00

parent 31f4f5b495

commit 8c40397f22

1 changed files with 1 additions and 1 deletions

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arch/x86/kernel/ptrace.c

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