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author | 2022-09-01 16:24:54 +0100 | |
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committer | 2022-09-08 16:50:07 -0700 | |
commit | beef988c2085e197ea5f36144dc753aff5b2e7af (patch) | |
tree | 94f3226b4cad00f3207217d9813608fd60cffcaf /kernel/module | |
parent | Linux 6.0-rc4 (diff) | |
download | linux-beef988c2085e197ea5f36144dc753aff5b2e7af.tar.gz linux-beef988c2085e197ea5f36144dc753aff5b2e7af.tar.bz2 linux-beef988c2085e197ea5f36144dc753aff5b2e7af.zip |
module: Add debugfs interface to view unloaded tainted modules
This patch provides debug/modules/unloaded_tainted file to see a
record of unloaded tainted modules.
Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Diffstat (limited to 'kernel/module')
-rw-r--r-- | kernel/module/tracking.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/kernel/module/tracking.c b/kernel/module/tracking.c index 7f8133044d09..a139e63b6f20 100644 --- a/kernel/module/tracking.c +++ b/kernel/module/tracking.c @@ -10,6 +10,7 @@ #include <linux/printk.h> #include <linux/slab.h> #include <linux/list.h> +#include <linux/debugfs.h> #include <linux/rculist.h> #include "internal.h" @@ -59,3 +60,70 @@ void print_unloaded_tainted_modules(void) } } } + +#ifdef CONFIG_DEBUG_FS +static void *unloaded_tainted_modules_seq_start(struct seq_file *m, loff_t *pos) + __acquires(rcu) +{ + rcu_read_lock(); + return seq_list_start_rcu(&unloaded_tainted_modules, *pos); +} + +static void *unloaded_tainted_modules_seq_next(struct seq_file *m, void *p, loff_t *pos) +{ + return seq_list_next_rcu(p, &unloaded_tainted_modules, pos); +} + +static void unloaded_tainted_modules_seq_stop(struct seq_file *m, void *p) + __releases(rcu) +{ + rcu_read_unlock(); +} + +static int unloaded_tainted_modules_seq_show(struct seq_file *m, void *p) +{ + struct mod_unload_taint *mod_taint; + char buf[MODULE_FLAGS_BUF_SIZE]; + size_t l; + + mod_taint = list_entry(p, struct mod_unload_taint, list); + l = module_flags_taint(mod_taint->taints, buf); + buf[l++] = '\0'; + + seq_printf(m, "%s (%s) %llu", mod_taint->name, buf, mod_taint->count); + seq_puts(m, "\n"); + + return 0; +} + +static const struct seq_operations unloaded_tainted_modules_seq_ops = { + .start = unloaded_tainted_modules_seq_start, + .next = unloaded_tainted_modules_seq_next, + .stop = unloaded_tainted_modules_seq_stop, + .show = unloaded_tainted_modules_seq_show, +}; + +static int unloaded_tainted_modules_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &unloaded_tainted_modules_seq_ops); +} + +static const struct file_operations unloaded_tainted_modules_fops = { + .open = unloaded_tainted_modules_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static int __init unloaded_tainted_modules_init(void) +{ + struct dentry *dir; + + dir = debugfs_create_dir("modules", NULL); + debugfs_create_file("unloaded_tainted", 0444, dir, NULL, + &unloaded_tainted_modules_fops); + + return 0; +} +module_init(unloaded_tainted_modules_init); +#endif /* CONFIG_DEBUG_FS */ |