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For all CONFIG_CFI+CONFIG_CALL_PADDING configs, for C functions, the __cfi_ symbols only cover the 5-byte kCFI type hash. After that there also N bytes of NOP padding between the hash and the function entry which aren't associated with any symbol. The NOPs can be replaced with actual code at runtime. Without a symbol, unwinders and tooling have no way of knowing where those bytes belong. Grow the existing __cfi_* symbols to fill that gap. Note that assembly functions with SYM_TYPED_FUNC_START() aren't affected by this issue, their __cfi_ symbols also cover the padding. Also, CONFIG_PREFIX_SYMBOLS has no reason to exist: CONFIG_CALL_PADDING is what causes the compiler to emit NOP padding before function entry (via -fpatchable-function-entry), so it's the right condition for creating prefix symbols. Remove CONFIG_PREFIX_SYMBOLS, as it's no longer needed. Simplify the LONGEST_SYM_KUNIT_TEST dependency accordingly. Rework objtool's arguments a bit to handle the variety of prefix/cfi-related cases. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
63 lines
1.0 KiB
C
63 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
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*/
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#ifndef _BUILTIN_H
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#define _BUILTIN_H
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#include <subcmd/parse-options.h>
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struct opts {
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/* actions: */
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bool checksum;
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const char *disas;
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bool dump_orc;
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bool hack_jump_label;
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bool hack_noinstr;
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bool hack_skylake;
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bool ibt;
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bool mcount;
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bool noabs;
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bool noinstr;
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bool orc;
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int prefix;
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bool retpoline;
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bool rethunk;
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bool unret;
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bool sls;
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bool stackval;
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bool static_call;
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bool uaccess;
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/* options: */
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bool backtrace;
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bool backup;
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bool cfi;
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const char *debug_checksum;
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bool dryrun;
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bool fineibt;
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bool link;
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bool mnop;
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bool module;
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bool no_unreachable;
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const char *output;
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bool sec_address;
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bool stats;
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const char *trace;
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bool verbose;
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bool werror;
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bool wide;
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};
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extern struct opts opts;
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int cmd_parse_options(int argc, const char **argv, const char * const usage[]);
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int objtool_run(int argc, const char **argv);
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int make_backup(void);
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int cmd_klp(int argc, const char **argv);
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#endif /* _BUILTIN_H */
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