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kheaders: Move from proc to sysfs 

The kheaders archive consisting of the kernel headers used for compiling
bpf programs is in /proc. However there is concern that moving it here
will make it permanent. Let us move it to /sys/kernel as discussed [1].

[1] https://lore.kernel.org/patchwork/patch/1067310/#1265969

Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joel Fernandes (Google) 2019-05-15 17:35:51 -04:00 committed by Greg Kroah-Hartman
parent a188339ca5
commit f7b101d330
4 changed files with 26 additions and 35 deletions
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15
init/Kconfig
View File

@ -579,15 +579,14 @@ config IKCONFIG_PROC
This option enables access to the kernel configuration file
through /proc/config.gz.
config IKHEADERS_PROC
tristate "Enable kernel header artifacts through /proc/kheaders.tar.xz"
depends on PROC_FS
config IKHEADERS
tristate "Enable kernel headers through /sys/kernel/kheaders.tar.xz"
depends on SYSFS
help
This option enables access to the kernel header and other artifacts that
are generated during the build process. These can be used to build eBPF
tracing programs, or similar programs. If you build the headers as a
module, a module called kheaders.ko is built which can be loaded on-demand
to get access to the headers.
This option enables access to the in-kernel headers that are generated during
the build process. These can be used to build eBPF tracing programs,
or similar programs. If you build the headers as a module, a module called
kheaders.ko is built which can be loaded on-demand to get access to headers.
config LOG_BUF_SHIFT
int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"

4
kernel/Makefile
View File

@ -71,7 +71,7 @@ obj-$(CONFIG_UTS_NS) += utsname.o
obj-$(CONFIG_USER_NS) += user_namespace.o
obj-$(CONFIG_PID_NS) += pid_namespace.o
obj-$(CONFIG_IKCONFIG) += configs.o
obj-$(CONFIG_IKHEADERS_PROC) += kheaders.o
obj-$(CONFIG_IKHEADERS) += kheaders.o
obj-$(CONFIG_SMP) += stop_machine.o
obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
@ -127,7 +127,7 @@ $(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
$(obj)/kheaders.o: $(obj)/kheaders_data.tar.xz
quiet_cmd_genikh = CHK $(obj)/kheaders_data.tar.xz
cmd_genikh = $(CONFIG_SHELL) $(srctree)/kernel/gen_ikh_data.sh $@
cmd_genikh = $(CONFIG_SHELL) $(srctree)/kernel/gen_kheaders.sh $@
$(obj)/kheaders_data.tar.xz: FORCE
$(call cmd,genikh)

2
kernel/gen_ikh_data.sh → kernel/gen_kheaders.sh
View File

@ -2,7 +2,7 @@
# SPDX-License-Identifier: GPL-2.0
# This script generates an archive consisting of kernel headers
# for CONFIG_IKHEADERS_PROC.
# for CONFIG_IKHEADERS.
set -e
spath="$(dirname "$(readlink -f "$0")")"
kroot="$spath/.."

40
kernel/kheaders.c
View File

@ -8,9 +8,8 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/kobject.h>
#include <linux/init.h>
#include <linux/uaccess.h>
/*
* Define kernel_headers_data and kernel_headers_data_end, within which the
@ -31,39 +30,32 @@ extern char kernel_headers_data;
extern char kernel_headers_data_end;
static ssize_t
ikheaders_read_current(struct file *file, char __user *buf,
size_t len, loff_t *offset)
ikheaders_read(struct file *file, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t len)
{
return simple_read_from_buffer(buf, len, offset,
&kernel_headers_data,
&kernel_headers_data_end -
&kernel_headers_data);
memcpy(buf, &kernel_headers_data + off, len);
return len;
}
static const struct file_operations ikheaders_file_ops = {
.read = ikheaders_read_current,
.llseek = default_llseek,
static struct bin_attribute kheaders_attr __ro_after_init = {
.attr = {
.name = "kheaders.tar.xz",
.mode = 0444,
},
.read = &ikheaders_read,
};
static int __init ikheaders_init(void)
{
struct proc_dir_entry *entry;
/* create the current headers file */
entry = proc_create("kheaders.tar.xz", S_IRUGO, NULL,
&ikheaders_file_ops);
if (!entry)
return -ENOMEM;
proc_set_size(entry,
&kernel_headers_data_end -
&kernel_headers_data);
return 0;
kheaders_attr.size = (&kernel_headers_data_end -
&kernel_headers_data);
return sysfs_create_bin_file(kernel_kobj, &kheaders_attr);
}
static void __exit ikheaders_cleanup(void)
{
remove_proc_entry("kheaders.tar.xz", NULL);
sysfs_remove_bin_file(kernel_kobj, &kheaders_attr);
}
module_init(ikheaders_init);