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| author |   Christoph Hellwig <hch@lst.de> | 2020-06-08 21:34:50 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-09 09:39:15 -0700 |
| commit | 98a23609b10364a51a1bb3688f8dd1cd1aa94a9a (patch) | |
| tree | 8cf32f92fccd8cd5264434d42fa68dcba4c2ab3c /arch/um | |
| parent | maccess: remove strncpy_from_unsafe (diff) | |
| download | linux-dev-98a23609b10364a51a1bb3688f8dd1cd1aa94a9a.tar.xz linux-dev-98a23609b10364a51a1bb3688f8dd1cd1aa94a9a.zip | |
maccess: always use strict semantics for probe_kernel_read
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>
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/kernel/maccess.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/um/kernel/maccess.c b/arch/um/kernel/maccess.c index ad2c538ce497..e929c0966696 100644 --- a/arch/um/kernel/maccess.c +++ b/arch/um/kernel/maccess.c @@ -7,7 +7,7 @@ #include <linux/kernel.h> #include <os.h> -bool probe_kernel_read_allowed(const void *src, size_t size, bool strict) +bool probe_kernel_read_allowed(const void *src, size_t size) { void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE); |