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maccess: unify the probe kernel arch hooks

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Currently architectures have to override every routine that probes
kernel memory, which includes a pure read and strcpy, both in strict
and not strict variants.  Just provide a single arch hooks instead to
make sure all architectures cover all the cases.

[akpm@linux-foundation.org: fix !CONFIG_X86_64 build]

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/20200521152301.2587579-11-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig
2020-06-08 21:34:27 -07:00
committed by Linus Torvalds
parent cd0309058f
commit eab0c6089b
5 changed files with 61 additions and 50 deletions
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10
arch/um/kernel/maccess.c
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@@ -7,15 +7,13 @@
#include <linux/kernel.h>
#include <os.h>
long probe_kernel_read(void *dst, const void *src, size_t size)
bool probe_kernel_read_allowed(const void *src, size_t size, bool strict)
{
void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
if ((unsigned long)src < PAGE_SIZE || size <= 0)
return -EFAULT;
return false;
if (os_mincore(psrc, size + src - psrc) <= 0)
return -EFAULT;
return __probe_kernel_read(dst, src, size);
return false;
return true;
}