1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SCHED_COREDUMP_H
3 #define _LINUX_SCHED_COREDUMP_H
4 
5 #include <linux/mm_types.h>
6 
7 #define SUID_DUMP_DISABLE	0	/* No setuid dumping */
8 #define SUID_DUMP_USER		1	/* Dump as user of process */
9 #define SUID_DUMP_ROOT		2	/* Dump as root */
10 
11 /* mm flags */
12 
13 /* for SUID_DUMP_* above */
14 #define MMF_DUMPABLE_BITS 2
15 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
16 
17 extern void set_dumpable(struct mm_struct *mm, int value);
18 /*
19  * This returns the actual value of the suid_dumpable flag. For things
20  * that are using this for checking for privilege transitions, it must
21  * test against SUID_DUMP_USER rather than treating it as a boolean
22  * value.
23  */
__get_dumpable(unsigned long mm_flags)24 static inline int __get_dumpable(unsigned long mm_flags)
25 {
26 	return mm_flags & MMF_DUMPABLE_MASK;
27 }
28 
get_dumpable(struct mm_struct * mm)29 static inline int get_dumpable(struct mm_struct *mm)
30 {
31 	return __get_dumpable(mm->flags);
32 }
33 
34 /* coredump filter bits */
35 #define MMF_DUMP_ANON_PRIVATE	2
36 #define MMF_DUMP_ANON_SHARED	3
37 #define MMF_DUMP_MAPPED_PRIVATE	4
38 #define MMF_DUMP_MAPPED_SHARED	5
39 #define MMF_DUMP_ELF_HEADERS	6
40 #define MMF_DUMP_HUGETLB_PRIVATE 7
41 #define MMF_DUMP_HUGETLB_SHARED  8
42 #define MMF_DUMP_DAX_PRIVATE	9
43 #define MMF_DUMP_DAX_SHARED	10
44 
45 #define MMF_DUMP_FILTER_SHIFT	MMF_DUMPABLE_BITS
46 #define MMF_DUMP_FILTER_BITS	9
47 #define MMF_DUMP_FILTER_MASK \
48 	(((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
49 #define MMF_DUMP_FILTER_DEFAULT \
50 	((1 << MMF_DUMP_ANON_PRIVATE) |	(1 << MMF_DUMP_ANON_SHARED) |\
51 	 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
52 
53 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
54 # define MMF_DUMP_MASK_DEFAULT_ELF	(1 << MMF_DUMP_ELF_HEADERS)
55 #else
56 # define MMF_DUMP_MASK_DEFAULT_ELF	0
57 #endif
58 					/* leave room for more dump flags */
59 #define MMF_VM_MERGEABLE	16	/* KSM may merge identical pages */
60 #define MMF_VM_HUGEPAGE		17	/* set when mm is available for
61 					   khugepaged */
62 /*
63  * This one-shot flag is dropped due to necessity of changing exe once again
64  * on NFS restore
65  */
66 //#define MMF_EXE_FILE_CHANGED	18	/* see prctl_set_mm_exe_file() */
67 
68 #define MMF_HAS_UPROBES		19	/* has uprobes */
69 #define MMF_RECALC_UPROBES	20	/* MMF_HAS_UPROBES can be wrong */
70 #define MMF_OOM_SKIP		21	/* mm is of no interest for the OOM killer */
71 #define MMF_UNSTABLE		22	/* mm is unstable for copy_from_user */
72 #define MMF_HUGE_ZERO_PAGE	23      /* mm has ever used the global huge zero page */
73 #define MMF_DISABLE_THP		24	/* disable THP for all VMAs */
74 #define MMF_OOM_REAP_QUEUED	25	/* mm was queued for oom_reaper */
75 #define MMF_MULTIPROCESS	26	/* mm is shared between processes */
76 /*
77  * MMF_HAS_PINNED: Whether this mm has pinned any pages.  This can be either
78  * replaced in the future by mm.pinned_vm when it becomes stable, or grow into
79  * a counter on its own. We're aggresive on this bit for now: even if the
80  * pinned pages were unpinned later on, we'll still keep this bit set for the
81  * lifecycle of this mm, just for simplicity.
82  */
83 #define MMF_HAS_PINNED		27	/* FOLL_PIN has run, never cleared */
84 
85 #define MMF_HAS_MDWE		28
86 #define MMF_HAS_MDWE_MASK	(1 << MMF_HAS_MDWE)
87 
88 #define MMF_DISABLE_THP_MASK	(1 << MMF_DISABLE_THP)
89 
90 #define MMF_INIT_MASK		(MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\
91 				 MMF_DISABLE_THP_MASK | MMF_HAS_MDWE_MASK)
92 
93 #define MMF_VM_MERGE_ANY	29
94 #define MMF_HAS_MDWE_NO_INHERIT	30
95 
mmf_init_flags(unsigned long flags)96 static inline unsigned long mmf_init_flags(unsigned long flags)
97 {
98 	if (flags & (1UL << MMF_HAS_MDWE_NO_INHERIT))
99 		flags &= ~((1UL << MMF_HAS_MDWE) |
100 			   (1UL << MMF_HAS_MDWE_NO_INHERIT));
101 	return flags & MMF_INIT_MASK;
102 }
103 
104 #endif /* _LINUX_SCHED_COREDUMP_H */
105