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| author |   Aaron Tomlin <atomlin@redhat.com> | 2022-05-02 21:52:52 +0100 |
|---|---|---|
| committer |   Luis Chamberlain <mcgrof@kernel.org> | 2022-05-12 10:29:41 -0700 |
| commit | 99bd9956551b27cb6f5b445abaced7e13b9976cd (patch) | |
| tree | cba54839c4a7c86927516142556a5335b5375400 /kernel/module/main.c | |
| parent | module: Move module_assert_mutex_or_preempt() to internal.h (diff) | |
| download | linux-dev-99bd9956551b27cb6f5b445abaced7e13b9976cd.tar.xz linux-dev-99bd9956551b27cb6f5b445abaced7e13b9976cd.zip | |
module: Introduce module unload taint tracking
Currently, only the initial module that tainted the kernel is
recorded e.g. when an out-of-tree module is loaded.
The purpose of this patch is to allow the kernel to maintain a record of
each unloaded module that taints the kernel. So, in addition to
displaying a list of linked modules (see print_modules()) e.g. in the
event of a detected bad page, unloaded modules that carried a taint/or
taints are displayed too. A tainted module unload count is maintained.
The number of tracked modules is not fixed. This feature is disabled by
default.
Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Diffstat (limited to 'kernel/module/main.c')
| -rw-r--r-- | kernel/module/main.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/module/main.c b/kernel/module/main.c index 7a0484900320..6c3b4a846645 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -1190,6 +1190,9 @@ static void free_module(struct module *mod) module_bug_cleanup(mod); /* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ synchronize_rcu(); + if (try_add_tainted_module(mod)) + pr_err("%s: adding tainted module to the unloaded tainted modules list failed.\n", + mod->name); mutex_unlock(&module_mutex); /* Clean up CFI for the module. */ @@ -3125,6 +3128,8 @@ void print_modules(void) continue; pr_cont(" %s%s", mod->name, module_flags(mod, buf)); } + + print_unloaded_tainted_modules(); preempt_enable(); if (last_unloaded_module[0]) pr_cont(" [last unloaded: %s]", last_unloaded_module); |