rpms
/
kernel
2
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Backport 5336377d6225959624146629ce3fc88ee8ecda3d for RHBZ 648571

This commit is contained in:
Josh Boyer 2011-09-12 10:59:49 -04:00
parent d078fed40e
commit cf5a635e41
2 changed files with 281 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
kernel.spec
View File

@ -48,7 +48,7 @@ Summary: The Linux kernel
# reset this by hand to 1 (or to 0 and then use rpmdev-bumpspec).
# scripts/rebase.sh should be made to do that for you, actually.
#
%global baserelease 96
%global baserelease 97
%global fedora_build %{baserelease}
# base_sublevel is the kernel version we're starting with and patching
@ -861,6 +861,9 @@ Patch14040: asix-add-USB-ID-for-Logitec-LAN-GTJ-U2A.patch
# RHBZ #665109
Patch14050: x86-PCI-don-t-use-native-Broadcom-CNB20LE-driver-whe.patch
# RHBZ #648571
Patch14051: modules-Fix-module_bug_list-list-corruption-race.patch
%endif
BuildRoot: %{_tmppath}/kernel-%{KVERREL}-root
@ -1621,6 +1624,9 @@ ApplyPatch asix-add-USB-ID-for-Logitec-LAN-GTJ-U2A.patch
# RHBZ #665109
ApplyPatch x86-PCI-don-t-use-native-Broadcom-CNB20LE-driver-whe.patch
# RHBZ #648571
ApplyPatch modules-Fix-module_bug_list-list-corruption-race.patch
# END OF PATCH APPLICATIONS
%endif
@ -2207,6 +2213,9 @@ fi
# and build.
%changelog
* Mon Sep 12 2011 Josh Boyer <jwboyer@redhat.com>
- Backport 5336377d to fix RHBZ #648571
* Wed Aug 31 2011 Josh Boyer <jwboyer@redhat.com> 2.6.35.14-96
- Add patch to fix RHBZ #665109

271
modules-Fix-module_bug_list-list-corruption-race.patch Normal file
View File

@ -0,0 +1,271 @@
From 9aad2d11106f9a42593ee8eb3f10bc469873a18e Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 5 Oct 2010 11:29:27 -0700
Subject: [PATCH] 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>
---
arch/avr32/kernel/module.c | 3 +--
arch/h8300/kernel/module.c | 3 +--
arch/mn10300/kernel/module.c | 3 +--
arch/parisc/kernel/module.c | 3 +--
arch/powerpc/kernel/module.c | 5 -----
arch/s390/kernel/module.c | 3 +--
arch/sh/kernel/module.c | 2 --
arch/x86/kernel/module.c | 3 +--
include/linux/module.h | 5 ++---
kernel/module.c | 4 ++++
lib/bug.c | 6 ++----
11 files changed, 14 insertions(+), 26 deletions(-)
diff --git a/arch/avr32/kernel/module.c b/arch/avr32/kernel/module.c
index 98f94d0..a727f54 100644
--- a/arch/avr32/kernel/module.c
+++ b/arch/avr32/kernel/module.c
@@ -314,10 +314,9 @@ int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
vfree(module->arch.syminfo);
module->arch.syminfo = NULL;
- return module_bug_finalize(hdr, sechdrs, module);
+ return 0;
}
void module_arch_cleanup(struct module *module)
{
- module_bug_cleanup(module);
}
diff --git a/arch/h8300/kernel/module.c b/arch/h8300/kernel/module.c
index 0865e29..db4953d 100644
--- a/arch/h8300/kernel/module.c
+++ b/arch/h8300/kernel/module.c
@@ -112,10 +112,9 @@ int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)
{
- return module_bug_finalize(hdr, sechdrs, me);
+ return 0;
}
void module_arch_cleanup(struct module *mod)
{
- module_bug_cleanup(mod);
}
diff --git a/arch/mn10300/kernel/module.c b/arch/mn10300/kernel/module.c
index 6aea7fd..196a111 100644
--- a/arch/mn10300/kernel/module.c
+++ b/arch/mn10300/kernel/module.c
@@ -206,7 +206,7 @@ int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)
{
- return module_bug_finalize(hdr, sechdrs, me);
+ return 0;
}
/*
@@ -214,5 +214,4 @@ int module_finalize(const Elf_Ehdr *hdr,
*/
void module_arch_cleanup(struct module *mod)
{
- module_bug_cleanup(mod);
}
diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c
index 159a2b8..6e81bb5 100644
--- a/arch/parisc/kernel/module.c
+++ b/arch/parisc/kernel/module.c
@@ -941,11 +941,10 @@ int module_finalize(const Elf_Ehdr *hdr,
nsyms = newptr - (Elf_Sym *)symhdr->sh_addr;
DEBUGP("NEW num_symtab %lu\n", nsyms);
symhdr->sh_size = nsyms * sizeof(Elf_Sym);
- return module_bug_finalize(hdr, sechdrs, me);
+ return 0;
}
void module_arch_cleanup(struct module *mod)
{
deregister_unwind_table(mod);
- module_bug_cleanup(mod);
}
diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c
index 477c663..4ef93ae 100644
--- a/arch/powerpc/kernel/module.c
+++ b/arch/powerpc/kernel/module.c
@@ -65,10 +65,6 @@ int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sect;
int err;
- err = module_bug_finalize(hdr, sechdrs, me);
- if (err)
- return err;
-
/* Apply feature fixups */
sect = find_section(hdr, sechdrs, "__ftr_fixup");
if (sect != NULL)
@@ -101,5 +97,4 @@ int module_finalize(const Elf_Ehdr *hdr,
void module_arch_cleanup(struct module *mod)
{
- module_bug_cleanup(mod);
}
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index 22cfd63..f7167ee 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -407,10 +407,9 @@ int module_finalize(const Elf_Ehdr *hdr,
{
vfree(me->arch.syminfo);
me->arch.syminfo = NULL;
- return module_bug_finalize(hdr, sechdrs, me);
+ return 0;
}
void module_arch_cleanup(struct module *mod)
{
- module_bug_cleanup(mod);
}
diff --git a/arch/sh/kernel/module.c b/arch/sh/kernel/module.c
index 43adddf..ae0be69 100644
--- a/arch/sh/kernel/module.c
+++ b/arch/sh/kernel/module.c
@@ -149,13 +149,11 @@ int module_finalize(const Elf_Ehdr *hdr,
int ret = 0;
ret |= module_dwarf_finalize(hdr, sechdrs, me);
- ret |= module_bug_finalize(hdr, sechdrs, me);
return ret;
}
void module_arch_cleanup(struct module *mod)
{
- module_bug_cleanup(mod);
module_dwarf_cleanup(mod);
}
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index e0bc186..1c355c5 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);
}
diff --git a/include/linux/module.h b/include/linux/module.h
index 8a6b9fd..aace066 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -686,17 +686,16 @@ extern int module_sysfs_initialized;
#ifdef CONFIG_GENERIC_BUG
-int module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
+void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
struct module *);
void module_bug_cleanup(struct module *);
#else /* !CONFIG_GENERIC_BUG */
-static inline int module_bug_finalize(const Elf_Ehdr *hdr,
+static inline void module_bug_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *mod)
{
- return 0;
}
static inline void module_bug_cleanup(struct module *mod) {}
#endif /* CONFIG_GENERIC_BUG */
diff --git a/kernel/module.c b/kernel/module.c
index 6c56282..eca6e02 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1533,6 +1533,7 @@ static int __unlink_module(void *_mod)
{
struct module *mod = _mod;
list_del(&mod->list);
+ module_bug_cleanup(mod);
return 0;
}
@@ -2538,6 +2539,7 @@ static noinline struct module *load_module(void __user *umod,
if (err < 0)
goto ddebug;
+ module_bug_finalize(hdr, sechdrs, mod);
list_add_rcu(&mod->list, &modules);
mutex_unlock(&module_mutex);
@@ -2564,6 +2566,8 @@ static noinline struct module *load_module(void __user *umod,
mutex_lock(&module_mutex);
/* Unlink carefully: kallsyms could be walking list. */
list_del_rcu(&mod->list);
+ module_bug_cleanup(mod);
+
ddebug:
dynamic_debug_remove(debug);
unlock:
diff --git a/lib/bug.c b/lib/bug.c
index f13daf4..c005615 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -72,8 +72,8 @@ static const struct bug_entry *module_find_bug(unsigned long bugaddr)
return NULL;
}
-int module_bug_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
- struct module *mod)
+void module_bug_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
+ struct module *mod)
{
char *secstrings;
unsigned int i;
@@ -97,8 +97,6 @@ int module_bug_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
* could potentially lead to deadlock and thus be counter-productive.
*/
list_add(&mod->bug_list, &module_bug_list);
-
- return 0;
}
void module_bug_cleanup(struct module *mod)
--
1.7.6