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| author |  Peter Zijlstra <peterz@infradead.org>
| 2022-03-08 16:30:54 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org>
| 2022-03-15 10:32:46 +0100 |
| commit | 08f87a93c8ec709698edba66a5167077181fc978 (patch) | |
| tree | c661600616cc6d3ffc329ed3fbdf30fcc05dc946 /tools/objtool/builtin-check.c | |
| parent | objtool: Add IBT/ENDBR decoding (diff) | |
| download | linux-08f87a93c8ec709698edba66a5167077181fc978.tar.gz linux-08f87a93c8ec709698edba66a5167077181fc978.tar.bz2 linux-08f87a93c8ec709698edba66a5167077181fc978.zip | |
objtool: Validate IBT assumptions
Intel IBT requires that every indirect JMP/CALL targets an ENDBR
instructions, failing this #CP happens and we die. Similarly, all
exception entries should be ENDBR.
Find all code relocations and ensure they're either an ENDBR
instruction or ANNOTATE_NOENDBR. For the exceptions look for
UNWIND_HINT_IRET_REGS at sym+0 not being ENDBR.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154319.705110141@infradead.org
Diffstat (limited to 'tools/objtool/builtin-check.c')
| -rw-r--r-- | tools/objtool/builtin-check.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c index 5c2fcaa2c260..fc6975ab8b06 100644 --- a/tools/objtool/builtin-check.c +++ b/tools/objtool/builtin-check.c @@ -20,7 +20,8 @@ #include <objtool/objtool.h> bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats, - lto, vmlinux, mcount, noinstr, backup, sls, dryrun; + lto, vmlinux, mcount, noinstr, backup, sls, dryrun, + ibt; static const char * const check_usage[] = { "objtool check [<options>] file.o", @@ -47,6 +48,7 @@ const struct option check_options[] = { OPT_BOOLEAN('B', "backup", &backup, "create .orig files before modification"), OPT_BOOLEAN('S', "sls", &sls, "validate straight-line-speculation"), OPT_BOOLEAN(0, "dry-run", &dryrun, "don't write the modifications"), + OPT_BOOLEAN(0, "ibt", &ibt, "validate ENDBR placement"), OPT_END(), }; |