glibc/SOURCES/glibc-rh1774114.patch

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2020-07-28 07:00:40 +00:00
commit 58e8f5fd2ba47b6dc47fd4d0a35e4175c7c87aaa
Author: Andreas Schwab <schwab@suse.de>
Date: Wed Oct 9 17:46:47 2019 +0200
ldconfig: handle .dynstr located in separate segment (bug 25087)
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.
diff --git a/elf/readelflib.c b/elf/readelflib.c
index 5a1e2dc2dfa36599..8774e779f5abbfbb 100644
--- a/elf/readelflib.c
+++ b/elf/readelflib.c
@@ -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;
}