mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Yafang Shao](/assets/img/avatar_default.png)
bpf_probe_read_kernel_str() will add a nul terminator to the dst, then we don't care about if the dst size is big enough. This patch also replaces the hard-coded 16 with TASK_COMM_LEN to make it grepable. Link: https://lkml.kernel.org/r/20211120112738.45980-6-laoar.shao@gmail.com Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com> Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com> Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com> Cc: Michal Miroslaw <mirq-linux@rere.qmqm.pl> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: David Hildenbrand <david@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Kees Cook <keescook@chromium.org> Cc: Petr Mladek <pmladek@suse.com> Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* Copyright (c) 2016 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/version.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/sched.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
|
|
#define _(P) \
|
|
({ \
|
|
typeof(P) val = 0; \
|
|
bpf_probe_read_kernel(&val, sizeof(val), &(P)); \
|
|
val; \
|
|
})
|
|
|
|
SEC("kprobe/__set_task_comm")
|
|
int prog(struct pt_regs *ctx)
|
|
{
|
|
struct signal_struct *signal;
|
|
struct task_struct *tsk;
|
|
char oldcomm[TASK_COMM_LEN] = {};
|
|
char newcomm[TASK_COMM_LEN] = {};
|
|
u16 oom_score_adj;
|
|
u32 pid;
|
|
|
|
tsk = (void *)PT_REGS_PARM1(ctx);
|
|
|
|
pid = _(tsk->pid);
|
|
bpf_probe_read_kernel_str(oldcomm, sizeof(oldcomm), &tsk->comm);
|
|
bpf_probe_read_kernel_str(newcomm, sizeof(newcomm),
|
|
(void *)PT_REGS_PARM2(ctx));
|
|
signal = _(tsk->signal);
|
|
oom_score_adj = _(signal->oom_score_adj);
|
|
return 0;
|
|
}
|
|
|
|
SEC("kprobe/urandom_read")
|
|
int prog2(struct pt_regs *ctx)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
u32 _version SEC("version") = LINUX_VERSION_CODE;
|