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| author |   Peter Zijlstra <peterz@infradead.org> | 2021-12-02 21:45:34 +0100 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2021-12-03 09:11:42 +0100 |
| commit | 988f01683c7f2bf9f8fe2bae1cf4010fcd1baaf5 (patch) | |
| tree | 7f348e2cd7069cf1c3a77fadaeba47effa4cd1b6 /tools/objtool | |
| parent | x86/tsc: Disable clocksource watchdog for TSC on qualified platorms (diff) | |
| download | linux-dev-988f01683c7f2bf9f8fe2bae1cf4010fcd1baaf5.tar.xz linux-dev-988f01683c7f2bf9f8fe2bae1cf4010fcd1baaf5.zip | |
objtool: Fix pv_ops noinstr validation
Boris reported that in one of his randconfig builds, objtool got
infinitely stuck. Turns out there's trivial list corruption in the
pv_ops tracking when a function is both in a static table and in a code
assignment.
Avoid re-adding function to the pv_ops[] lists when they're already on
it.
Fixes: db2b0c5d7b6f ("objtool: Support pv_opsindirect calls for noinstr")
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Borislav Petkov <bp@alien8.de>
Link: https://lkml.kernel.org/r/20211202204534.GA16608@worktop.programming.kicks-ass.net
Diffstat (limited to 'tools/objtool')
| -rw-r--r-- | tools/objtool/elf.c | 1 | ||||
| -rw-r--r-- | tools/objtool/objtool.c | 4 |
2 files changed, 5 insertions, 0 deletions
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index 81a4c543ff7e..4b384c907027 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -375,6 +375,7 @@ static int read_symbols(struct elf *elf) return -1; } memset(sym, 0, sizeof(*sym)); + INIT_LIST_HEAD(&sym->pv_target); sym->alias = sym; sym->idx = i; diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c index c90c7084e45a..bdf699f6552b 100644 --- a/tools/objtool/objtool.c +++ b/tools/objtool/objtool.c @@ -153,6 +153,10 @@ void objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func) !strcmp(func->name, "_paravirt_ident_64")) return; + /* already added this function */ + if (!list_empty(&func->pv_target)) + return; + list_add(&func->pv_target, &f->pv_ops[idx].targets); f->pv_ops[idx].clean = false; } |