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libs/libc/elf: Find the symbols of a stripped shared object.

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libelf_findsymtab() accepted only a SHT_SYMTAB section.  A shared object
that strip has processed has no SHT_SYMTAB: only its SHT_DYNSYM remains.
With CONFIG_DEBUG_SYMBOLS the application build strips each module in
bin/, so every FDPIC module that it builds fails to load with "No symbols
in ELF file".

Use the dynamic symbol table of a shared object when it has no other
symbol table.  It holds every symbol that the object imports or exports,
which is what the loader looks up.  An object with SHT_SYMTAB still uses
it.

Assisted-by: Claude Code:claude-opus-5-5
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
This commit is contained in:
Marco Casaroli 2026-10-06 19:02:04 +02:00 • committed by Alan C. Assis
parent 602affafe8
commit ba1ae7947a
1 changed files with 11 additions and 1 deletions
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12
libs/libc/elf/elf_symbols.c
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@ -254,7 +254,10 @@ int libelf_findsymtab(FAR struct mod_loadinfo_s *loadinfo)
{
int i;
/* Find the symbol table section header and its associated string table */
/* Find the symbol table section header and its associated string table.
* A stripped shared object keeps only its dynamic symbol table, which
* holds every symbol that it imports or exports.
*/
for (i = 1; i < loadinfo->ehdr.e_shnum; i++)
{
@ -264,6 +267,13 @@ int libelf_findsymtab(FAR struct mod_loadinfo_s *loadinfo)
loadinfo->strtabidx = loadinfo->shdr[i].sh_link;
break;
}
if (loadinfo->shdr[i].sh_type == SHT_DYNSYM &&
loadinfo->ehdr.e_type == ET_DYN)
{
loadinfo->symtabidx = i;
loadinfo->strtabidx = loadinfo->shdr[i].sh_link;
}
}
/* Verify that there is a symbol and string table */