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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-30 12:29:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-30 12:29:36 -0700 |
| commit | 65c61de9d090edb8a3cfb3f45541e268eb2cdb13 (patch) | |
| tree | f8298d9571a200b42824929bfd2d679fce162361 | |
| parent | c70a4be130de333ea079c59da41cc959712bb01c (diff) | |
| parent | 33121347fb1c359bd6e3e680b9f2c6ced5734a81 (diff) | |
Merge tag 'modules-for-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux
Pull module updates from Jessica Yu:
"Fix an age old bug involving jump_calls and static_labels when
CONFIG_MODULE_UNLOAD=n.
When CONFIG_MODULE_UNLOAD=n, it means you can't unload modules, so
normally the __exit sections of a module are not loaded at all.
However, dynamic code patching (jump_label, static_call, alternatives)
can have sites in __exit sections even if __exit is never executed.
Reported by Peter Zijlstra:
'Alternatives, jump_labels and static_call all can have relocations
into __exit code. Not loading it at all would be BAD.'
Therefore, load the __exit sections even when CONFIG_MODULE_UNLOAD=n,
and discard them after init"
* tag 'modules-for-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
module: treat exit sections the same as init sections when !CONFIG_MODULE_UNLOAD
| -rw-r--r-- | kernel/module.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/module.c b/kernel/module.c index 20fb004e7d8d..b5dd92e35b02 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -2807,7 +2807,11 @@ void * __weak module_alloc(unsigned long size) bool __weak module_init_section(const char *name) { +#ifndef CONFIG_MODULE_UNLOAD + return strstarts(name, ".init") || module_exit_section(name); +#else return strstarts(name, ".init"); +#endif } bool __weak module_exit_section(const char *name) @@ -3121,11 +3125,6 @@ static int rewrite_section_headers(struct load_info *info, int flags) */ shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; -#ifndef CONFIG_MODULE_UNLOAD - /* Don't load .exit sections */ - if (module_exit_section(info->secstrings+shdr->sh_name)) - shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; -#endif } /* Track but don't keep modinfo and version sections. */ |