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authorChristoph Hellwig <hch@lst.de>2020-06-08 21:34:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:15 -0700
commit98a23609b10364a51a1bb3688f8dd1cd1aa94a9a (patch)
tree8cf32f92fccd8cd5264434d42fa68dcba4c2ab3c /include
parent7676fbf21b5fa04341c8046c2cbcd1949293e7ec (diff)
downloadlinux-98a23609b10364a51a1bb3688f8dd1cd1aa94a9a.tar.bz2
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 'include')
-rw-r--r--include/linux/uaccess.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 4183e585dee6..dac1db05bf7e 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -301,11 +301,9 @@ copy_struct_from_user(void *dst, size_t ksize, const void __user *src,
return 0;
}
-bool probe_kernel_read_allowed(const void *unsafe_src, size_t size,
- bool strict);
+bool probe_kernel_read_allowed(const void *unsafe_src, size_t size);
extern long probe_kernel_read(void *dst, const void *src, size_t size);
-extern long probe_kernel_read_strict(void *dst, const void *src, size_t size);
extern long probe_user_read(void *dst, const void __user *src, size_t size);
extern long notrace probe_kernel_write(void *dst, const void *src, size_t size);