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elf: Copy l_addr/l_ld when adding ld.so to a new namespace

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When add ld.so to a new namespace, we don't actually load ld.so.  We
create a new link map and refers the real one for almost everything.
Copy l_addr and l_ld from the real ld.so link map to avoid GDB warning:

warning: .dynamic section for ".../elf/ld-linux-x86-64.so.2" is not at the expected address (wrong library or version mismatch?)

when handling shared library loaded by dlmopen.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
H.J. Lu 2021-08-17 19:36:04 -07:00
parent ee874f44fd
commit 88361b408b
1 changed files with 4 additions and 0 deletions
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4
elf/dl-load.c
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@ -1026,6 +1026,10 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
/* Refer to the real descriptor. */
l->l_real = &GL(dl_rtld_map);
/* Copy l_addr and l_ld to avoid a GDB warning with dlmopen(). */
l->l_addr = l->l_real->l_addr;
l->l_ld = l->l_real->l_ld;
/* No need to bump the refcount of the real object, ld.so will
never be unloaded. */
__close_nocancel (fd);