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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-05 11:29:27 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-05 11:29:27 -0700 |
commit | 5336377d6225959624146629ce3fc88ee8ecda3d (patch) | |
tree | 571b9db75d1ba50faa1e399509563f367fd5694f /arch/x86/kernel/module.c | |
parent | 2f6b3aa7a563d05453c4d73ccf88191aee84333f (diff) | |
download | linux-stable-5336377d6225959624146629ce3fc88ee8ecda3d.tar.gz linux-stable-5336377d6225959624146629ce3fc88ee8ecda3d.tar.bz2 linux-stable-5336377d6225959624146629ce3fc88ee8ecda3d.zip |
modules: Fix module_bug_list list corruption race
With all the recent module loading cleanups, we've minimized the code
that sits under module_mutex, fixing various deadlocks and making it
possible to do most of the module loading in parallel.
However, that whole conversion totally missed the rather obscure code
that adds a new module to the list for BUG() handling. That code was
doubly obscure because (a) the code itself lives in lib/bugs.c (for
dubious reasons) and (b) it gets called from the architecture-specific
"module_finalize()" rather than from generic code.
Calling it from arch-specific code makes no sense what-so-ever to begin
with, and is now actively wrong since that code isn't protected by the
module loading lock any more.
So this commit moves the "module_bug_{finalize,cleanup}()" calls away
from the arch-specific code, and into the generic code - and in the
process protects it with the module_mutex so that the list operations
are now safe.
Future fixups:
- move the module list handling code into kernel/module.c where it
belongs.
- get rid of 'module_bug_list' and just use the regular list of modules
(called 'modules' - imagine that) that we already create and maintain
for other reasons.
Reported-and-tested-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Adrian Bunk <bunk@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/kernel/module.c')
-rw-r--r-- | arch/x86/kernel/module.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c index e0bc186d7501..1c355c550960 100644 --- a/arch/x86/kernel/module.c +++ b/arch/x86/kernel/module.c @@ -239,11 +239,10 @@ int module_finalize(const Elf_Ehdr *hdr, apply_paravirt(pseg, pseg + para->sh_size); } - return module_bug_finalize(hdr, sechdrs, me); + return 0; } void module_arch_cleanup(struct module *mod) { alternatives_smp_module_del(mod); - module_bug_cleanup(mod); } |