The patch titled
Subject: kallsyms: unexport kallsyms_lookup_name() and kallsyms_on_each_symbol()
has been added to the -mm tree. Its filename is
kallsyms-unexport-kallsyms_lookup_name-and-kallsyms_on_each_symbol.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kallsyms-unexport-kallsyms_lookup_name-and-kallsyms_on_each_symbol.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kallsyms-unexport-kallsyms_lookup_name-and-kallsyms_on_each_symbol.patch
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------------------------------------------------------
From: Will Deacon <will@xxxxxxxxxx>
Subject: kallsyms: unexport kallsyms_lookup_name() and kallsyms_on_each_symbol()
kallsyms_lookup_name() and kallsyms_on_each_symbol() are exported to
modules despite having no in-tree users and being wide open to abuse by
out-of-tree modules that can use them as a method to invoke arbitrary
non-exported kernel functions.
Unexport kallsyms_lookup_name() and kallsyms_on_each_symbol().
Link: http://lkml.kernel.org/r/20200221114404.14641-4-will@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Acked-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Reviewed-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Quentin Perret <qperret@xxxxxxxxxx>
Cc: Frederic Weisbecker <frederic@xxxxxxxxxx>
Cc: K.Prasad <prasad@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kallsyms.c | 2 --
1 file changed, 2 deletions(-)
--- a/kernel/kallsyms.c~kallsyms-unexport-kallsyms_lookup_name-and-kallsyms_on_each_symbol
+++ a/kernel/kallsyms.c
@@ -175,7 +175,6 @@ unsigned long kallsyms_lookup_name(const
}
return module_kallsyms_lookup_name(name);
}
-EXPORT_SYMBOL_GPL(kallsyms_lookup_name);
int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
unsigned long),
@@ -194,7 +193,6 @@ int kallsyms_on_each_symbol(int (*fn)(vo
}
return module_kallsyms_on_each_symbol(fn, data);
}
-EXPORT_SYMBOL_GPL(kallsyms_on_each_symbol);
static unsigned long get_symbol_pos(unsigned long addr,
unsigned long *symbolsize,
_
Patches currently in -mm which might be from will@xxxxxxxxxx are
samples-hw_breakpoint-drop-hw_breakpoint_r-when-reporting-writes.patch
samples-hw_breakpoint-drop-use-of-kallsyms_lookup_name.patch
kallsyms-unexport-kallsyms_lookup_name-and-kallsyms_on_each_symbol.patch
