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module: Account for the build time module name mangling 

Sean noted that scripts/Makefile.lib:name-fix-token rule will mangle
the module name with s/-/_/g.

Since this happens late in the build, only the kernel needs to bother
with this, the modpost tool still sees the original name.

Reported-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Tested-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Peter Zijlstra 2025-05-02 16:12:08 +02:00 committed by Masahiro Yamada
parent 754f8733fc
commit 0267cbf297
1 changed files with 25 additions and 1 deletions
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26
kernel/module/main.c
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@ -169,6 +169,30 @@ static inline void add_taint_module(struct module *mod, unsigned flag,
set_bit(flag, &mod->taints);
}
/*
* Like strncmp(), except s/-/_/g as per scripts/Makefile.lib:name-fix-token rule.
*/
static int mod_strncmp(const char *str_a, const char *str_b, size_t n)
{
for (int i = 0; i < n; i++) {
char a = str_a[i];
char b = str_b[i];
int d;
if (a == '-') a = '_';
if (b == '-') b = '_';
d = a - b;
if (d)
return d;
if (!a)
break;
}
return 0;
}
/*
* A thread that wants to hold a reference to a module only while it
* is running can call this to safely exit.
@ -1116,7 +1140,7 @@ static bool verify_module_namespace(const char *namespace, const char *modname)
if (*sep)
sep++;
if (strncmp(namespace, modname, len) == 0 && (glob || len == modlen))
if (mod_strncmp(namespace, modname, len) == 0 && (glob || len == modlen))
return true;
}