1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/elf.h>
3 #include <linux/coredump.h>
4 #include <linux/fs.h>
5 #include <linux/mm.h>
6 
7 #include <asm/elf.h>
8 
9 
elf_core_extra_phdrs(void)10 Elf64_Half elf_core_extra_phdrs(void)
11 {
12 	return GATE_EHDR->e_phnum;
13 }
14 
elf_core_write_extra_phdrs(struct coredump_params * cprm,loff_t offset)15 int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
16 {
17 	const struct elf_phdr *const gate_phdrs =
18 		(const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
19 	int i;
20 	Elf64_Off ofs = 0;
21 
22 	for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
23 		struct elf_phdr phdr = gate_phdrs[i];
24 
25 		if (phdr.p_type == PT_LOAD) {
26 			phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz);
27 			phdr.p_filesz = phdr.p_memsz;
28 			if (ofs == 0) {
29 				ofs = phdr.p_offset = offset;
30 				offset += phdr.p_filesz;
31 			} else {
32 				phdr.p_offset = ofs;
33 			}
34 		} else {
35 			phdr.p_offset += ofs;
36 		}
37 		phdr.p_paddr = 0; /* match other core phdrs */
38 		if (!dump_emit(cprm, &phdr, sizeof(phdr)))
39 			return 0;
40 	}
41 	return 1;
42 }
43 
elf_core_write_extra_data(struct coredump_params * cprm)44 int elf_core_write_extra_data(struct coredump_params *cprm)
45 {
46 	const struct elf_phdr *const gate_phdrs =
47 		(const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
48 	int i;
49 
50 	for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
51 		if (gate_phdrs[i].p_type == PT_LOAD) {
52 			void *addr = (void *)gate_phdrs[i].p_vaddr;
53 			size_t memsz = PAGE_ALIGN(gate_phdrs[i].p_memsz);
54 
55 			if (!dump_emit(cprm, addr, memsz))
56 				return 0;
57 			break;
58 		}
59 	}
60 	return 1;
61 }
62 
elf_core_extra_data_size(void)63 size_t elf_core_extra_data_size(void)
64 {
65 	const struct elf_phdr *const gate_phdrs =
66 		(const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
67 	int i;
68 	size_t size = 0;
69 
70 	for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
71 		if (gate_phdrs[i].p_type == PT_LOAD) {
72 			size += PAGE_ALIGN(gate_phdrs[i].p_memsz);
73 			break;
74 		}
75 	}
76 	return size;
77 }
78