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module: abort module loading when sysfs setup suffer errors

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When insmod a kernel module, if fails in add_notes_attrs or
add_sysfs_attrs such as memory allocation fail, mod_sysfs_setup
will still return success, but we can't access user interface
on android device.

Patch for make mod_sysfs_setup can check the error of
add_notes_attrs and add_sysfs_attrs

[mcgrof: the section stuff comes from linux history.git [0]]
Fixes: 3f7b0672086b ("Module section offsets in /sys/module") [0]
Fixes: 6d76013381 ("Add /sys/module/name/notes")
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409010016.3XIFSmRA-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202409072018.qfEzZbO7-lkp@intel.com/
Link: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=3f7b0672086b97b2d7f322bdc289cbfa203f10ef [0]
Signed-off-by: Xion Wang <xion.wang@mediatek.com>
Signed-off-by: Chunhui Li <chunhui.li@mediatek.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Chunhui Li 2024-09-11 11:28:02 +08:00 committed by Luis Chamberlain
parent 907fa79d78
commit ce47f7cbbc
1 changed files with 42 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
kernel/module/sysfs.c
View File

@ -69,12 +69,13 @@ static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
kfree(sect_attrs);
}
static void add_sect_attrs(struct module *mod, const struct load_info *info)
static int add_sect_attrs(struct module *mod, const struct load_info *info)
{
unsigned int nloaded = 0, i, size[2];
struct module_sect_attrs *sect_attrs;
struct module_sect_attr *sattr;
struct bin_attribute **gattr;
int ret;
/* Count loaded sections and allocate structures */
for (i = 0; i < info->hdr->e_shnum; i++)
@ -85,7 +86,7 @@ static void add_sect_attrs(struct module *mod, const struct load_info *info)
size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.bin_attrs[0]);
sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
if (!sect_attrs)
return;
return -ENOMEM;
/* Setup section attributes. */
sect_attrs->grp.name = "sections";
@ -103,8 +104,10 @@ static void add_sect_attrs(struct module *mod, const struct load_info *info)
sattr->address = sec->sh_addr;
sattr->battr.attr.name =
kstrdup(info->secstrings + sec->sh_name, GFP_KERNEL);
if (!sattr->battr.attr.name)
if (!sattr->battr.attr.name) {
ret = -ENOMEM;
goto out;
}
sect_attrs->nsections++;
sattr->battr.read = module_sect_read;
sattr->battr.size = MODULE_SECT_READ_SIZE;
@ -113,13 +116,15 @@ static void add_sect_attrs(struct module *mod, const struct load_info *info)
}
*gattr = NULL;
if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
ret = sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp);
if (ret)
goto out;
mod->sect_attrs = sect_attrs;
return;
return 0;
out:
free_sect_attrs(sect_attrs);
return ret;
}
static void remove_sect_attrs(struct module *mod)
@ -158,15 +163,12 @@ static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
kfree(notes_attrs);
}
static void add_notes_attrs(struct module *mod, const struct load_info *info)
static int add_notes_attrs(struct module *mod, const struct load_info *info)
{
unsigned int notes, loaded, i;
struct module_notes_attrs *notes_attrs;
struct bin_attribute *nattr;
/* failed to create section attributes, so can't create notes */
if (!mod->sect_attrs)
return;
int ret;
/* Count notes sections and allocate structures. */
notes = 0;
@ -176,12 +178,12 @@ static void add_notes_attrs(struct module *mod, const struct load_info *info)
++notes;
if (notes == 0)
return;
return 0;
notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes),
GFP_KERNEL);
if (!notes_attrs)
return;
return -ENOMEM;
notes_attrs->notes = notes;
nattr = &notes_attrs->attrs[0];
@ -201,19 +203,23 @@ static void add_notes_attrs(struct module *mod, const struct load_info *info)
}
notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
if (!notes_attrs->dir)
if (!notes_attrs->dir) {
ret = -ENOMEM;
goto out;
}
for (i = 0; i < notes; ++i)
if (sysfs_create_bin_file(notes_attrs->dir,
&notes_attrs->attrs[i]))
for (i = 0; i < notes; ++i) {
ret = sysfs_create_bin_file(notes_attrs->dir, &notes_attrs->attrs[i]);
if (ret)
goto out;
}
mod->notes_attrs = notes_attrs;
return;
return 0;
out:
free_notes_attrs(notes_attrs, i);
return ret;
}
static void remove_notes_attrs(struct module *mod)
@ -223,9 +229,15 @@ static void remove_notes_attrs(struct module *mod)
}
#else /* !CONFIG_KALLSYMS */
static inline void add_sect_attrs(struct module *mod, const struct load_info *info) { }
static inline int add_sect_attrs(struct module *mod, const struct load_info *info)
{
return 0;
}
static inline void remove_sect_attrs(struct module *mod) { }
static inline void add_notes_attrs(struct module *mod, const struct load_info *info) { }
static inline int add_notes_attrs(struct module *mod, const struct load_info *info)
{
return 0;
}
static inline void remove_notes_attrs(struct module *mod) { }
#endif /* CONFIG_KALLSYMS */
@ -385,11 +397,20 @@ int mod_sysfs_setup(struct module *mod,
if (err)
goto out_unreg_modinfo_attrs;
add_sect_attrs(mod, info);
add_notes_attrs(mod, info);
err = add_sect_attrs(mod, info);
if (err)
goto out_del_usage_links;
err = add_notes_attrs(mod, info);
if (err)
goto out_unreg_sect_attrs;
return 0;
out_unreg_sect_attrs:
remove_sect_attrs(mod);
out_del_usage_links:
del_usage_links(mod);
out_unreg_modinfo_attrs:
module_remove_modinfo_attrs(mod, -1);
out_unreg_param: