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authorAlexey Dobriyan <adobriyan@sw.ru>2007-05-08 00:28:47 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:08 -0700
commita5c43dae7ae38c2a6b3e9a819bcf45f010bf6a4a (patch)
treeb30da7a4541e803e35a6a74ad33e836442c3f6c8 /kernel
parent9d65cb4a1718a072898c7a57a3bc61b2dc4bcd4d (diff)
downloadop-kernel-dev-a5c43dae7ae38c2a6b3e9a819bcf45f010bf6a4a.zip
op-kernel-dev-a5c43dae7ae38c2a6b3e9a819bcf45f010bf6a4a.tar.gz
Fix race between cat /proc/slab_allocators and rmmod
Same story as with cat /proc/*/wchan race vs rmmod race, only /proc/slab_allocators want more info than just symbol name. Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/kallsyms.c19
-rw-r--r--kernel/module.c27
2 files changed, 46 insertions, 0 deletions
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 4e2ec19..c36581b 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -286,6 +286,25 @@ int lookup_symbol_name(unsigned long addr, char *symname)
return lookup_module_symbol_name(addr, symname);
}
+int lookup_symbol_attrs(unsigned long addr, unsigned long *size,
+ unsigned long *offset, char *modname, char *name)
+{
+ name[0] = '\0';
+ name[KSYM_NAME_LEN] = '\0';
+
+ if (is_ksym_addr(addr)) {
+ unsigned long pos;
+
+ pos = get_symbol_pos(addr, size, offset);
+ /* Grab name */
+ kallsyms_expand_symbol(get_symbol_offset(pos), name);
+ modname[0] = '\0';
+ return 0;
+ }
+ /* see if it's in a module */
+ return lookup_module_symbol_attrs(addr, size, offset, modname, name);
+}
+
/* Look up a kernel symbol and return it in a text buffer. */
int sprint_symbol(char *buffer, unsigned long address)
{
diff --git a/kernel/module.c b/kernel/module.c
index 3da76ad..d36e454 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2149,6 +2149,33 @@ out:
return -ERANGE;
}
+int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
+ unsigned long *offset, char *modname, char *name)
+{
+ struct module *mod;
+
+ mutex_lock(&module_mutex);
+ list_for_each_entry(mod, &modules, list) {
+ if (within(addr, mod->module_init, mod->init_size) ||
+ within(addr, mod->module_core, mod->core_size)) {
+ const char *sym;
+
+ sym = get_ksymbol(mod, addr, size, offset);
+ if (!sym)
+ goto out;
+ if (modname)
+ strlcpy(modname, mod->name, MODULE_NAME_LEN + 1);
+ if (name)
+ strlcpy(name, sym, KSYM_NAME_LEN + 1);
+ mutex_unlock(&module_mutex);
+ return 0;
+ }
+ }
+out:
+ mutex_unlock(&module_mutex);
+ return -ERANGE;
+}
+
int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
char *name, char *module_name, int *exported)
{
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