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authorAlexey Dobriyan <adobriyan@gmail.com>2009-03-25 22:48:06 +0300
committerAlexey Dobriyan <adobriyan@gmail.com>2009-03-31 01:14:44 +0400
commit99b76233803beab302123d243eea9e41149804f3 (patch)
tree398178210fe66845ccd6fa4258ba762a87e023ad /arch
parent3dec7f59c370c7b58184d63293c3dc984d475840 (diff)
downloadlinux-99b76233803beab302123d243eea9e41149804f3.tar.xz
proc 2/2: remove struct proc_dir_entry::owner
Setting ->owner as done currently (pde->owner = THIS_MODULE) is racy as correctly noted at bug #12454. Someone can lookup entry with NULL ->owner, thus not pinning enything, and release it later resulting in module refcount underflow. We can keep ->owner and supply it at registration time like ->proc_fops and ->data. But this leaves ->owner as easy-manipulative field (just one C assignment) and somebody will forget to unpin previous/pin current module when switching ->owner. ->proc_fops is declared as "const" which should give some thoughts. ->read_proc/->write_proc were just fixed to not require ->owner for protection. rmmod'ed directories will be empty and return "." and ".." -- no harm. And directories with tricky enough readdir and lookup shouldn't be modular. We definitely don't want such modular code. Removing ->owner will also make PDE smaller. So, let's nuke it. Kudos to Jeff Layton for reminding about this, let's say, oversight. http://bugzilla.kernel.org/show_bug.cgi?id=12454 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/alpha/kernel/srm_env.c5
-rw-r--r--arch/blackfin/mm/sram-alloc.c1
-rw-r--r--arch/ia64/kernel/palinfo.c2
-rw-r--r--arch/ia64/sn/kernel/sn2/prominfo_proc.c9
-rw-r--r--arch/powerpc/kernel/rtas_flash.c1
-rw-r--r--arch/sparc/kernel/led.c1
-rw-r--r--arch/x86/kernel/cpu/mtrr/if.c10
7 files changed, 3 insertions, 26 deletions
diff --git a/arch/alpha/kernel/srm_env.c b/arch/alpha/kernel/srm_env.c
index 78ad7cd1bbd6..d12af472e1c0 100644
--- a/arch/alpha/kernel/srm_env.c
+++ b/arch/alpha/kernel/srm_env.c
@@ -218,7 +218,6 @@ srm_env_init(void)
BASE_DIR);
goto cleanup;
}
- base_dir->owner = THIS_MODULE;
/*
* Create per-name subdirectory
@@ -229,7 +228,6 @@ srm_env_init(void)
BASE_DIR, NAMED_DIR);
goto cleanup;
}
- named_dir->owner = THIS_MODULE;
/*
* Create per-number subdirectory
@@ -241,7 +239,6 @@ srm_env_init(void)
goto cleanup;
}
- numbered_dir->owner = THIS_MODULE;
/*
* Create all named nodes
@@ -254,7 +251,6 @@ srm_env_init(void)
goto cleanup;
entry->proc_entry->data = (void *) entry;
- entry->proc_entry->owner = THIS_MODULE;
entry->proc_entry->read_proc = srm_env_read;
entry->proc_entry->write_proc = srm_env_write;
@@ -275,7 +271,6 @@ srm_env_init(void)
entry->id = var_num;
entry->proc_entry->data = (void *) entry;
- entry->proc_entry->owner = THIS_MODULE;
entry->proc_entry->read_proc = srm_env_read;
entry->proc_entry->write_proc = srm_env_write;
}
diff --git a/arch/blackfin/mm/sram-alloc.c b/arch/blackfin/mm/sram-alloc.c
index 834cab7438a8..530d1393a232 100644
--- a/arch/blackfin/mm/sram-alloc.c
+++ b/arch/blackfin/mm/sram-alloc.c
@@ -854,7 +854,6 @@ static int __init sram_proc_init(void)
printk(KERN_WARNING "unable to create /proc/sram\n");
return -1;
}
- ptr->owner = THIS_MODULE;
ptr->read_proc = sram_proc_read;
return 0;
}
diff --git a/arch/ia64/kernel/palinfo.c b/arch/ia64/kernel/palinfo.c
index e5c57f413ca2..a4f19c70aadd 100644
--- a/arch/ia64/kernel/palinfo.c
+++ b/arch/ia64/kernel/palinfo.c
@@ -1002,8 +1002,6 @@ create_palinfo_proc_entries(unsigned int cpu)
*pdir = create_proc_read_entry(
palinfo_entries[j].name, 0, cpu_dir,
palinfo_read_entry, (void *)f.value);
- if (*pdir)
- (*pdir)->owner = THIS_MODULE;
pdir++;
}
}
diff --git a/arch/ia64/sn/kernel/sn2/prominfo_proc.c b/arch/ia64/sn/kernel/sn2/prominfo_proc.c
index 4dcce3d0e04c..e63328818643 100644
--- a/arch/ia64/sn/kernel/sn2/prominfo_proc.c
+++ b/arch/ia64/sn/kernel/sn2/prominfo_proc.c
@@ -225,7 +225,6 @@ static struct proc_dir_entry *sgi_prominfo_entry;
int __init prominfo_init(void)
{
struct proc_dir_entry **entp;
- struct proc_dir_entry *p;
cnodeid_t cnodeid;
unsigned long nasid;
int size;
@@ -246,14 +245,10 @@ int __init prominfo_init(void)
sprintf(name, "node%d", cnodeid);
*entp = proc_mkdir(name, sgi_prominfo_entry);
nasid = cnodeid_to_nasid(cnodeid);
- p = create_proc_read_entry("fit", 0, *entp, read_fit_entry,
+ create_proc_read_entry("fit", 0, *entp, read_fit_entry,
(void *)nasid);
- if (p)
- p->owner = THIS_MODULE;
- p = create_proc_read_entry("version", 0, *entp,
+ create_proc_read_entry("version", 0, *entp,
read_version_entry, (void *)nasid);
- if (p)
- p->owner = THIS_MODULE;
entp++;
}
diff --git a/arch/powerpc/kernel/rtas_flash.c b/arch/powerpc/kernel/rtas_flash.c
index 149cb112cd1a..13011a96a977 100644
--- a/arch/powerpc/kernel/rtas_flash.c
+++ b/arch/powerpc/kernel/rtas_flash.c
@@ -669,7 +669,6 @@ static void remove_flash_pde(struct proc_dir_entry *dp)
{
if (dp) {
kfree(dp->data);
- dp->owner = NULL;
remove_proc_entry(dp->name, dp->parent);
}
}
diff --git a/arch/sparc/kernel/led.c b/arch/sparc/kernel/led.c
index adaaed4ea2fb..00d034ea2164 100644
--- a/arch/sparc/kernel/led.c
+++ b/arch/sparc/kernel/led.c
@@ -126,7 +126,6 @@ static int __init led_init(void)
led = proc_create("led", 0, NULL, &led_proc_fops);
if (!led)
return -ENOMEM;
- led->owner = THIS_MODULE;
printk(KERN_INFO
"led: version %s, Lars Kotthoff <metalhead@metalhead.ws>\n",
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index 4c4214690dd1..fb73a52913a4 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -377,10 +377,6 @@ static const struct file_operations mtrr_fops = {
.release = mtrr_close,
};
-
-static struct proc_dir_entry *proc_root_mtrr;
-
-
static int mtrr_seq_show(struct seq_file *seq, void *offset)
{
char factor;
@@ -423,11 +419,7 @@ static int __init mtrr_if_init(void)
(!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
return -ENODEV;
- proc_root_mtrr =
- proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_fops);
-
- if (proc_root_mtrr)
- proc_root_mtrr->owner = THIS_MODULE;
+ proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_fops);
return 0;
}