The routine to search a symbol in ELF can be shared, so split it out.
Signed-off-by: Pingfan Liu <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Philipp Rudo <[email protected]>
To: [email protected]
---
kernel/kexec_file.c | 86 ++++++++++++++++++++++-------------------
kernel/kexec_internal.h | 1 +
2 files changed, 47 insertions(+), 40 deletions(-)
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index f9674bb5bd8db..9731019ba2a1a 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -889,6 +889,51 @@ static int kexec_calculate_store_digests(struct kimage
*image)
return ret;
}
+#if defined(CONFIG_ARCH_SUPPORTS_KEXEC_PURGATORY) || defined(CONFIG_KEXEC_BPF)
+const Elf_Sym *elf_find_symbol(const Elf_Ehdr *ehdr, const char *name)
+{
+ const Elf_Shdr *sechdrs;
+ const Elf_Sym *syms;
+ const char *strtab;
+ int i, k;
+
+ sechdrs = (void *)ehdr + ehdr->e_shoff;
+
+ for (i = 0; i < ehdr->e_shnum; i++) {
+ if (sechdrs[i].sh_type != SHT_SYMTAB)
+ continue;
+
+ if (sechdrs[i].sh_link >= ehdr->e_shnum)
+ /* Invalid strtab section number */
+ continue;
+ strtab = (void *)ehdr + sechdrs[sechdrs[i].sh_link].sh_offset;
+ syms = (void *)ehdr + sechdrs[i].sh_offset;
+
+ /* Go through symbols for a match */
+ for (k = 0; k < sechdrs[i].sh_size/sizeof(Elf_Sym); k++) {
+ if (ELF_ST_BIND(syms[k].st_info) != STB_GLOBAL)
+ continue;
+
+ if (strcmp(strtab + syms[k].st_name, name) != 0)
+ continue;
+
+ if (syms[k].st_shndx == SHN_UNDEF ||
+ syms[k].st_shndx >= ehdr->e_shnum) {
+ pr_debug("Symbol: %s has bad section index
%d.\n",
+ name, syms[k].st_shndx);
+ return NULL;
+ }
+
+ /* Found the symbol we are looking for */
+ return &syms[k];
+ }
+ }
+
+ return NULL;
+}
+
+#endif
+
#ifdef CONFIG_ARCH_SUPPORTS_KEXEC_PURGATORY
/*
* kexec_purgatory_setup_kbuf - prepare buffer to load purgatory.
@@ -1146,49 +1191,10 @@ int kexec_load_purgatory(struct kimage *image, struct
kexec_buf *kbuf)
static const Elf_Sym *kexec_purgatory_find_symbol(struct purgatory_info *pi,
const char *name)
{
- const Elf_Shdr *sechdrs;
- const Elf_Ehdr *ehdr;
- const Elf_Sym *syms;
- const char *strtab;
- int i, k;
-
if (!pi->ehdr)
return NULL;
- ehdr = pi->ehdr;
- sechdrs = (void *)ehdr + ehdr->e_shoff;
-
- for (i = 0; i < ehdr->e_shnum; i++) {
- if (sechdrs[i].sh_type != SHT_SYMTAB)
- continue;
-
- if (sechdrs[i].sh_link >= ehdr->e_shnum)
- /* Invalid strtab section number */
- continue;
- strtab = (void *)ehdr + sechdrs[sechdrs[i].sh_link].sh_offset;
- syms = (void *)ehdr + sechdrs[i].sh_offset;
-
- /* Go through symbols for a match */
- for (k = 0; k < sechdrs[i].sh_size/sizeof(Elf_Sym); k++) {
- if (ELF_ST_BIND(syms[k].st_info) != STB_GLOBAL)
- continue;
-
- if (strcmp(strtab + syms[k].st_name, name) != 0)
- continue;
-
- if (syms[k].st_shndx == SHN_UNDEF ||
- syms[k].st_shndx >= ehdr->e_shnum) {
- pr_debug("Symbol: %s has bad section index
%d.\n",
- name, syms[k].st_shndx);
- return NULL;
- }
-
- /* Found the symbol we are looking for */
- return &syms[k];
- }
- }
-
- return NULL;
+ return elf_find_symbol(pi->ehdr, name);
}
void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name)
diff --git a/kernel/kexec_internal.h b/kernel/kexec_internal.h
index ee01d0c8bb377..2e8e0fedbe2a9 100644
--- a/kernel/kexec_internal.h
+++ b/kernel/kexec_internal.h
@@ -40,6 +40,7 @@ extern bool pe_has_bpf_section(const char *file_buf, unsigned
long pe_sz);
extern int pe_get_section(const char *file_buf, const char *sect_name,
char **sect_start, unsigned long *sect_sz);
extern int decompose_kexec_image(struct kimage *image, int extended_fd);
+extern const Elf_Sym *elf_find_symbol(const Elf_Ehdr *ehdr, const char *name);
#else /* CONFIG_KEXEC_FILE */
static inline void kimage_file_post_load_cleanup(struct kimage *image) { }
#endif /* CONFIG_KEXEC_FILE */
--
2.49.0
