[PATCH v5 1/3] module: Make module_flags_taint() accept a module's taints bitmap and usable outside core code

Aaron Tomlin
2022-05-02T20:51:21Z

No functional change.

The purpose of this patch is to modify module_flags_taint() to accept
a module's taints bitmap as a parameter and modifies all users
accordingly. Furthermore, it is now possible to access a given
module's taint flags data outside of non-essential code yet does
remain for internal use only.

This is in preparation for module unload taint tracking support.

Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
---
kernel/module/internal.h | 1 +
kernel/module/main.c | 8 ++++----
2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/kernel/module/internal.h b/kernel/module/internal.h
index 3e23bef5884d..abbd1c5ef264 100644
--- a/kernel/module/internal.h
+++ b/kernel/module/internal.h
@@ -100,6 +100,7 @@ int cmp_name(const void *name, const void *sym);
long module_get_offset(struct module *mod, unsigned int *size, Elf_Shdr *sechdr,
unsigned int section);
char *module_flags(struct module *mod, char *buf);
+size_t module_flags_taint(unsigned long taints, char *buf);

static inline unsigned long kernel_symbol_value(const struct kernel_symbol *sym)
{
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 05a42d8fcd7a..7dbdd098b995 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -890,13 +890,13 @@ static inline int module_unload_init(struct module *mod)
}
#endif /* CONFIG_MODULE_UNLOAD */

-static size_t module_flags_taint(struct module *mod, char *buf)
+size_t module_flags_taint(unsigned long taints, char *buf)
{
size_t l = 0;
int i;

for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
- if (taint_flags[i].module && test_bit(i, &mod->taints))
+ if (taint_flags[i].module && test_bit(i, &taints))
buf[l++] = taint_flags[i].c_true;
}

@@ -974,7 +974,7 @@ static ssize_t show_taint(struct module_attribute *mattr,
{
size_t l;

- l = module_flags_taint(mk->mod, buffer);
+ l = module_flags_taint(mk->mod->taints, buffer);
buffer[l++] = '\n';
return l;
}
@@ -2993,7 +2993,7 @@ char *module_flags(struct module *mod, char *buf)
mod->state == MODULE_STATE_GOING ||
mod->state == MODULE_STATE_COMING) {
buf[bx++] = '(';
- bx += module_flags_taint(mod, buf + bx);
+ bx += module_flags_taint(mod->taints, buf + bx);
/* Show a - for module-is-being-unloaded */
if (mod->state == MODULE_STATE_GOING)
buf[bx++] = '-';
--
2.34.1