mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-02-28 19:06:51 +01:00
bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Init code for a livepatch kernel module
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/livepatch.h>
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static struct klp_patch *patch;
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static int __init livepatch_mod_init(void)
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{
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struct klp_object_ext *obj_exts;
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size_t obj_exts_sec_size;
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struct klp_object *objs;
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unsigned int nr_objs;
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int ret;
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obj_exts = klp_find_section_by_name(THIS_MODULE, ".init.klp_objects",
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&obj_exts_sec_size);
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nr_objs = obj_exts_sec_size / sizeof(*obj_exts);
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if (!nr_objs) {
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pr_err("nothing to patch!\n");
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ret = -EINVAL;
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goto err;
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}
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patch = kzalloc_obj(*patch);
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if (!patch) {
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ret = -ENOMEM;
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goto err;
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}
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objs = kzalloc(sizeof(struct klp_object) * (nr_objs + 1), GFP_KERNEL);
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if (!objs) {
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ret = -ENOMEM;
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goto err_free_patch;
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}
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for (int i = 0; i < nr_objs; i++) {
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struct klp_object_ext *obj_ext = obj_exts + i;
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struct klp_func_ext *funcs_ext = obj_ext->funcs;
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unsigned int nr_funcs = obj_ext->nr_funcs;
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struct klp_func *funcs = objs[i].funcs;
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struct klp_object *obj = objs + i;
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funcs = kzalloc(sizeof(struct klp_func) * (nr_funcs + 1), GFP_KERNEL);
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if (!funcs) {
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ret = -ENOMEM;
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for (int j = 0; j < i; j++)
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kfree(objs[i].funcs);
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goto err_free_objs;
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}
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for (int j = 0; j < nr_funcs; j++) {
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funcs[j].old_name = funcs_ext[j].old_name;
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funcs[j].new_func = funcs_ext[j].new_func;
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funcs[j].old_sympos = funcs_ext[j].sympos;
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}
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obj->name = obj_ext->name;
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obj->funcs = funcs;
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memcpy(&obj->callbacks, &obj_ext->callbacks, sizeof(struct klp_callbacks));
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}
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patch->mod = THIS_MODULE;
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patch->objs = objs;
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/* TODO patch->states */
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#ifdef KLP_NO_REPLACE
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patch->replace = false;
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#else
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patch->replace = true;
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#endif
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return klp_enable_patch(patch);
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err_free_objs:
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kfree(objs);
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err_free_patch:
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kfree(patch);
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err:
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return ret;
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}
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static void __exit livepatch_mod_exit(void)
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{
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struct klp_object *obj;
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klp_for_each_object_static(patch, obj)
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kfree(obj->funcs);
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kfree(patch->objs);
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kfree(patch);
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}
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module_init(livepatch_mod_init);
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module_exit(livepatch_mod_exit);
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MODULE_LICENSE("GPL");
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MODULE_INFO(livepatch, "Y");
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MODULE_DESCRIPTION("Livepatch module");
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