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ldconfig: handle .dynstr located in separate segment (bug 25087)

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To determine the load offset of the DT_STRTAB section search for the
segment containing it, instead of using the load offset of the first
segment.
This commit is contained in:
Andreas Schwab
2019-10-09 17:46:47 +02:00
parent e7c8ffe4ec
commit 58e8f5fd2b
1 changed files with 23 additions and 13 deletions
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36
elf/readelflib.c
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@@ -45,7 +45,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
{
int i;
unsigned int j;
ElfW(Addr) loadaddr;
unsigned int dynamic_addr;
size_t dynamic_size;
char *program_interpreter;
@@ -87,7 +86,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
libc5/libc6. */
*flag = FLAG_ELF;
loadaddr = -1;
dynamic_addr = 0;
dynamic_size = 0;
program_interpreter = NULL;
@@ -98,11 +96,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
switch (segment->p_type)
{
case PT_LOAD:
if (loadaddr == (ElfW(Addr)) -1)
loadaddr = segment->p_vaddr - segment->p_offset;
break;
case PT_DYNAMIC:
if (dynamic_addr)
error (0, 0, _("more than one dynamic segment\n"));
@@ -176,11 +169,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
}
}
if (loadaddr == (ElfW(Addr)) -1)
{
/* Very strange. */
loadaddr = 0;
}
/* Now we can read the dynamic sections. */
if (dynamic_size == 0)
@@ -197,7 +185,29 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
check_ptr (dyn_entry);
if (dyn_entry->d_tag == DT_STRTAB)
{
dynamic_strings = (char *) (file_contents + dyn_entry->d_un.d_val - loadaddr);
/* Find the file offset of the segment containing the dynamic
string table. */
ElfW(Off) loadoff = -1;
for (i = 0, segment = elf_pheader;
i < elf_header->e_phnum; i++, segment++)
{
if (segment->p_type == PT_LOAD
&& dyn_entry->d_un.d_val >= segment->p_vaddr
&& (dyn_entry->d_un.d_val - segment->p_vaddr
< segment->p_filesz))
{
loadoff = segment->p_vaddr - segment->p_offset;
break;
}
}
if (loadoff == (ElfW(Off)) -1)
{
/* Very strange. */
loadoff = 0;
}
dynamic_strings = (char *) (file_contents + dyn_entry->d_un.d_val
- loadoff);
check_ptr (dynamic_strings);
break;
}