Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2021 Facebook */
|
|
#include "vmlinux.h"
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
|
|
struct callback_ctx {
|
|
int dummy;
|
|
};
|
|
|
|
#define VM_EXEC 0x00000004
|
|
#define DNAME_INLINE_LEN 32
|
|
|
|
pid_t target_pid = 0;
|
|
char d_iname[DNAME_INLINE_LEN] = {0};
|
|
__u32 found_vm_exec = 0;
|
|
__u64 addr = 0;
|
|
int find_zero_ret = -1;
|
|
int find_addr_ret = -1;
|
|
|
|
static long check_vma(struct task_struct *task, struct vm_area_struct *vma,
|
|
struct callback_ctx *data)
|
|
{
|
|
if (vma->vm_file)
|
|
bpf_probe_read_kernel_str(d_iname, DNAME_INLINE_LEN - 1,
|
|
vma->vm_file->f_path.dentry->d_shortname.string);
|
|
|
|
/* check for VM_EXEC */
|
|
if (vma->vm_flags & VM_EXEC)
|
|
found_vm_exec = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
SEC("raw_tp/sys_enter")
|
|
int handle_getpid(void)
|
|
{
|
|
struct task_struct *task = bpf_get_current_task_btf();
|
|
struct callback_ctx data = {};
|
|
|
|
if (task->pid != target_pid)
|
|
return 0;
|
|
|
|
find_addr_ret = bpf_find_vma(task, addr, check_vma, &data, 0);
|
|
|
|
/* this should return -ENOENT */
|
|
find_zero_ret = bpf_find_vma(task, 0, check_vma, &data, 0);
|
|
return 0;
|
|
}
|
|
|
|
SEC("perf_event")
|
|
int handle_pe(void)
|
|
{
|
|
struct task_struct *task = bpf_get_current_task_btf();
|
|
struct callback_ctx data = {};
|
|
|
|
if (task->pid != target_pid)
|
|
return 0;
|
|
|
|
find_addr_ret = bpf_find_vma(task, addr, check_vma, &data, 0);
|
|
|
|
/* In NMI, this should return -EBUSY, as the previous call is using
|
|
* the irq_work.
|
|
*/
|
|
find_zero_ret = bpf_find_vma(task, 0, check_vma, &data, 0);
|
|
return 0;
|
|
}
|