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1 #include <linux/elf.h>
2 #include <linux/coredump.h>
3 #include <linux/fs.h>
4 #include <linux/mm.h>
5 
6 #include <asm/elf.h>
7 
8 
elf_core_extra_phdrs(void)9 Elf32_Half elf_core_extra_phdrs(void)
10 {
11 	return vsyscall_ehdr ? (((struct elfhdr *)vsyscall_ehdr)->e_phnum) : 0;
12 }
13 
elf_core_write_extra_phdrs(struct coredump_params * cprm,loff_t offset)14 int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
15 {
16 	if ( vsyscall_ehdr ) {
17 		const struct elfhdr *const ehdrp =
18 			(struct elfhdr *) vsyscall_ehdr;
19 		const struct elf_phdr *const phdrp =
20 			(const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
21 		int i;
22 		Elf32_Off ofs = 0;
23 
24 		for (i = 0; i < ehdrp->e_phnum; ++i) {
25 			struct elf_phdr phdr = phdrp[i];
26 
27 			if (phdr.p_type == PT_LOAD) {
28 				ofs = phdr.p_offset = offset;
29 				offset += phdr.p_filesz;
30 			} else {
31 				phdr.p_offset += ofs;
32 			}
33 			phdr.p_paddr = 0; /* match other core phdrs */
34 			if (!dump_emit(cprm, &phdr, sizeof(phdr)))
35 				return 0;
36 		}
37 	}
38 	return 1;
39 }
40 
elf_core_write_extra_data(struct coredump_params * cprm)41 int elf_core_write_extra_data(struct coredump_params *cprm)
42 {
43 	if ( vsyscall_ehdr ) {
44 		const struct elfhdr *const ehdrp =
45 			(struct elfhdr *) vsyscall_ehdr;
46 		const struct elf_phdr *const phdrp =
47 			(const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
48 		int i;
49 
50 		for (i = 0; i < ehdrp->e_phnum; ++i) {
51 			if (phdrp[i].p_type == PT_LOAD) {
52 				void *addr = (void *) phdrp[i].p_vaddr;
53 				size_t filesz = phdrp[i].p_filesz;
54 				if (!dump_emit(cprm, addr, filesz))
55 					return 0;
56 			}
57 		}
58 	}
59 	return 1;
60 }
61 
elf_core_extra_data_size(void)62 size_t elf_core_extra_data_size(void)
63 {
64 	if ( vsyscall_ehdr ) {
65 		const struct elfhdr *const ehdrp =
66 			(struct elfhdr *)vsyscall_ehdr;
67 		const struct elf_phdr *const phdrp =
68 			(const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
69 		int i;
70 
71 		for (i = 0; i < ehdrp->e_phnum; ++i)
72 			if (phdrp[i].p_type == PT_LOAD)
73 				return (size_t) phdrp[i].p_filesz;
74 	}
75 	return 0;
76 }
77