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FROMGIT: kallsyms: unexport kallsyms_lookup_name() and kallsyms_on_each_symbol()

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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().

Bug: 149978696
Change-Id: I8f3c1b5222939c46901f4d149d4c7bb63916ff04
Link: http://lkml.kernel.org/r/20200221114404.14641-4-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Quentin Perret <qperret@google.com>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Joe Lawrence <joe.lawrence@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit ab3e66797c7fddbf80fbba31c5bf4574ad52f320
 https://github.com/hnaz/linux-mm.git master)
Signed-off-by: Quentin Perret <qperret@google.com>
This commit is contained in:
Will Deacon 2020-03-10 05:03:31 +00:00 • committed by Quentin Perret
commit 6a3acdbcc7
1 changed files with 0 additions and 2 deletions
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2
kernel/kallsyms.c
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@ -174,7 +174,6 @@ unsigned long kallsyms_lookup_name(const char *name)
}
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),
@ -193,7 +192,6 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
}
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,