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 */
24 static inline int __get_dumpable(unsigned long mm_flags)
25 {
26 return mm_flags & MMF_DUMPABLE_MASK;
27 }
28
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_DISABLE_THP_MASK (1 << MMF_DISABLE_THP)
75 #define MMF_OOM_REAP_QUEUED 25 /* mm was queued for oom_reaper */
76 #define MMF_MULTIPROCESS 26 /* mm is shared between processes */
77 /*
78 * MMF_HAS_PINNED: Whether this mm has pinned any pages. This can be either
79 * replaced in the future by mm.pinned_vm when it becomes stable, or grow into
80 * a counter on its own. We're aggresive on this bit for now: even if the
81 * pinned pages were unpinned later on, we'll still keep this bit set for the
82 * lifecycle of this mm, just for simplicity.
83 */
84 #define MMF_HAS_PINNED 27 /* FOLL_PIN has run, never cleared */
85
86 #define MMF_HAS_MDWE 28
87 #define MMF_HAS_MDWE_MASK (1 << MMF_HAS_MDWE)
88
89
90 #define MMF_HAS_MDWE_NO_INHERIT 29
91
92 #define MMF_VM_MERGE_ANY 30
93 #define MMF_VM_MERGE_ANY_MASK (1 << MMF_VM_MERGE_ANY)
94
95 #define MMF_TOPDOWN 31 /* mm searches top down by default */
96 #define MMF_TOPDOWN_MASK (1 << MMF_TOPDOWN)
97
98 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\
99 MMF_DISABLE_THP_MASK | MMF_HAS_MDWE_MASK |\
100 MMF_VM_MERGE_ANY_MASK | MMF_TOPDOWN_MASK)
101
102 static inline unsigned long mmf_init_flags(unsigned long flags)
103 {
104 if (flags & (1UL << MMF_HAS_MDWE_NO_INHERIT))
105 flags &= ~((1UL << MMF_HAS_MDWE) |
106 (1UL << MMF_HAS_MDWE_NO_INHERIT));
107 return flags & MMF_INIT_MASK;
108 }
109
110 #endif /* _LINUX_SCHED_COREDUMP_H */
111
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