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https://github.com/JakeHillion/drgn.git
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0c790883f0
The current linux_helper_task_iterator implementation does a loop over
the tasks list and an inner loop over task->thread_group. However, Linux
kernel commit 8e1f385104ac ("kill task_struct->thread_group") (in
v6.7-rc1) broke this.
Rework the implementation to loop over task->signal->thread_head,
equivalent to the kernel's for_each_process_thread() macro. This works
for all supported kernel versions and 6.7.
Signed-off-by: Omar Sandoval <osandov@osandov.com>
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: LGPL-2.1-or-later
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/**
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* @file
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*
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* Helpers implemented in C.
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*
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* Most drgn helpers are implemented in Python. However, there are a few that we
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* need internally in libdrgn, so they are implemented in C, instead.
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*/
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#ifndef DRGN_HELPERS_H
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#define DRGN_HELPERS_H
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#include <stddef.h>
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#include <stdint.h>
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#include "drgn.h"
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struct drgn_object;
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struct drgn_program;
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struct drgn_error *linux_helper_direct_mapping_offset(struct drgn_program *prog,
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uint64_t *ret);
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struct drgn_error *linux_helper_read_vm(struct drgn_program *prog,
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uint64_t pgtable, uint64_t virt_addr,
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void *buf, size_t count);
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struct drgn_error *linux_helper_follow_phys(struct drgn_program *prog,
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uint64_t pgtable,
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uint64_t virt_addr, uint64_t *ret);
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struct drgn_error *linux_helper_per_cpu_ptr(struct drgn_object *res,
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const struct drgn_object *ptr,
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uint64_t cpu);
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struct drgn_error *linux_helper_cpu_curr(struct drgn_object *res, uint64_t cpu);
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struct drgn_error *linux_helper_idle_task(struct drgn_object *res,
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uint64_t cpu);
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struct drgn_error *linux_helper_task_cpu(const struct drgn_object *task,
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uint64_t *ret);
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struct drgn_error *
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linux_helper_xa_load(struct drgn_object *res, const struct drgn_object *xa,
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uint64_t index);
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struct drgn_error *linux_helper_idr_find(struct drgn_object *res,
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const struct drgn_object *idr,
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uint64_t id);
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struct drgn_error *linux_helper_find_pid(struct drgn_object *res,
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const struct drgn_object *ns,
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uint64_t pid);
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struct drgn_error *linux_helper_pid_task(struct drgn_object *res,
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const struct drgn_object *pid,
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uint64_t pid_type);
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struct drgn_error *linux_helper_find_task(struct drgn_object *res,
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const struct drgn_object *ns,
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uint64_t pid);
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struct linux_helper_task_iterator {
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struct drgn_object tasks_node;
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struct drgn_object thread_node;
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uint64_t tasks_head;
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uint64_t thread_head;
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struct drgn_qualified_type task_struct_type;
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bool done;
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};
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struct drgn_error *
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linux_helper_task_iterator_init(struct linux_helper_task_iterator *it,
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struct drgn_program *prog);
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void linux_helper_task_iterator_deinit(struct linux_helper_task_iterator *it);
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/** Get the next task from a @ref linux_helper_task_iterator. */
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struct drgn_error *
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linux_helper_task_iterator_next(struct linux_helper_task_iterator *it,
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struct drgn_object *ret);
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#endif /* DRGN_HELPERS_H */
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