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58cf9c383c
... so that they can be copied with struct assignment (which generates better code) and accessed word-by-word. The type is union shortname_storage; it's a union of arrays of unsigned char and unsigned long. struct name_snapshot.inline_name turned into union shortname_storage; users (all in fs/dcache.c) adjusted. struct dentry.d_iname has some users outside of fs/dcache.c; to reduce the amount of noise in commit, it is replaced with union shortname_storage d_shortname and d_iname is turned into a macro that expands to d_shortname.string (similar to d_lock handling). That compat macro is temporary - most of the remaining instances will be taken out by debugfs series, and once that is merged and few others are taken care of this will go away. Reviewed-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Facebook */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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struct callback_ctx {
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int dummy;
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};
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#define VM_EXEC 0x00000004
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#define DNAME_INLINE_LEN 32
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pid_t target_pid = 0;
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char d_iname[DNAME_INLINE_LEN] = {0};
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__u32 found_vm_exec = 0;
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__u64 addr = 0;
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int find_zero_ret = -1;
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int find_addr_ret = -1;
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static long check_vma(struct task_struct *task, struct vm_area_struct *vma,
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struct callback_ctx *data)
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{
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if (vma->vm_file)
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bpf_probe_read_kernel_str(d_iname, DNAME_INLINE_LEN - 1,
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vma->vm_file->f_path.dentry->d_shortname.string);
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/* check for VM_EXEC */
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if (vma->vm_flags & VM_EXEC)
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found_vm_exec = 1;
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return 0;
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}
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SEC("raw_tp/sys_enter")
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int handle_getpid(void)
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{
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struct task_struct *task = bpf_get_current_task_btf();
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struct callback_ctx data = {};
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if (task->pid != target_pid)
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return 0;
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find_addr_ret = bpf_find_vma(task, addr, check_vma, &data, 0);
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/* this should return -ENOENT */
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find_zero_ret = bpf_find_vma(task, 0, check_vma, &data, 0);
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return 0;
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}
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SEC("perf_event")
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int handle_pe(void)
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{
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struct task_struct *task = bpf_get_current_task_btf();
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struct callback_ctx data = {};
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if (task->pid != target_pid)
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return 0;
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find_addr_ret = bpf_find_vma(task, addr, check_vma, &data, 0);
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/* In NMI, this should return -EBUSY, as the previous call is using
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* the irq_work.
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*/
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find_zero_ret = bpf_find_vma(task, 0, check_vma, &data, 0);
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return 0;
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}
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