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95af469c4f
It is better to use get_task_comm() instead of the open coded string
copy as we do in other places.
struct elf_prpsinfo is used to dump the task information in userspace
coredump or kernel vmcore. Below is the verification of vmcore,
crash> ps
PID PPID CPU TASK ST %MEM VSZ RSS COMM
0 0 0 ffffffff9d21a940 RU 0.0 0 0 [swapper/0]
> 0 0 1 ffffa09e40f85e80 RU 0.0 0 0 [swapper/1]
> 0 0 2 ffffa09e40f81f80 RU 0.0 0 0 [swapper/2]
> 0 0 3 ffffa09e40f83f00 RU 0.0 0 0 [swapper/3]
> 0 0 4 ffffa09e40f80000 RU 0.0 0 0 [swapper/4]
> 0 0 5 ffffa09e40f89f80 RU 0.0 0 0 [swapper/5]
0 0 6 ffffa09e40f8bf00 RU 0.0 0 0 [swapper/6]
> 0 0 7 ffffa09e40f88000 RU 0.0 0 0 [swapper/7]
> 0 0 8 ffffa09e40f8de80 RU 0.0 0 0 [swapper/8]
> 0 0 9 ffffa09e40f95e80 RU 0.0 0 0 [swapper/9]
> 0 0 10 ffffa09e40f91f80 RU 0.0 0 0 [swapper/10]
> 0 0 11 ffffa09e40f93f00 RU 0.0 0 0 [swapper/11]
> 0 0 12 ffffa09e40f90000 RU 0.0 0 0 [swapper/12]
> 0 0 13 ffffa09e40f9bf00 RU 0.0 0 0 [swapper/13]
> 0 0 14 ffffa09e40f98000 RU 0.0 0 0 [swapper/14]
> 0 0 15 ffffa09e40f9de80 RU 0.0 0 0 [swapper/15]
It works well as expected.
Some comments are added to explain why we use the hard-coded 16.
Link: https://lkml.kernel.org/r/20211120112738.45980-5-laoar.shao@gmail.com
Suggested-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Arnaldo Carvalho de Melo <arnaldo.melo@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: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
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>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_ELFCORE_COMPAT_H
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#define _LINUX_ELFCORE_COMPAT_H
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#include <linux/elf.h>
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#include <linux/elfcore.h>
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#include <linux/compat.h>
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/*
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* Make sure these layouts match the linux/elfcore.h native definitions.
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*/
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struct compat_elf_siginfo
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{
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compat_int_t si_signo;
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compat_int_t si_code;
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compat_int_t si_errno;
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};
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struct compat_elf_prstatus_common
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{
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struct compat_elf_siginfo pr_info;
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short pr_cursig;
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compat_ulong_t pr_sigpend;
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compat_ulong_t pr_sighold;
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compat_pid_t pr_pid;
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compat_pid_t pr_ppid;
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compat_pid_t pr_pgrp;
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compat_pid_t pr_sid;
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struct old_timeval32 pr_utime;
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struct old_timeval32 pr_stime;
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struct old_timeval32 pr_cutime;
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struct old_timeval32 pr_cstime;
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};
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struct compat_elf_prpsinfo
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{
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char pr_state;
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char pr_sname;
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char pr_zomb;
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char pr_nice;
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compat_ulong_t pr_flag;
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__compat_uid_t pr_uid;
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__compat_gid_t pr_gid;
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compat_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
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/*
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* The hard-coded 16 is derived from TASK_COMM_LEN, but it can't be
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* changed as it is exposed to userspace. We'd better make it hard-coded
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* here.
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*/
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char pr_fname[16];
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char pr_psargs[ELF_PRARGSZ];
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};
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#ifdef CONFIG_ARCH_HAS_ELFCORE_COMPAT
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#include <asm/elfcore-compat.h>
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#endif
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struct compat_elf_prstatus
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{
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struct compat_elf_prstatus_common common;
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compat_elf_gregset_t pr_reg;
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compat_int_t pr_fpvalid;
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};
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#endif /* _LINUX_ELFCORE_COMPAT_H */
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