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98a23609b1
Except for historical confusion in the kprobes/uprobes and bpf tracers, which has been fixed now, there is no good reason to ever allow user memory accesses from probe_kernel_read. Switch probe_kernel_read to only read from kernel memory. [akpm@linux-foundation.org: update it for "mm, dump_page(): do not crash with invalid mapping pointer"] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20200521152301.2587579-17-hch@lst.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
20 lines
449 B
C
20 lines
449 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
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*/
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <os.h>
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bool probe_kernel_read_allowed(const void *src, size_t size)
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{
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void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
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if ((unsigned long)src < PAGE_SIZE || size <= 0)
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return false;
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if (os_mincore(psrc, size + src - psrc) <= 0)
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return false;
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return true;
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}
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