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authorH.J. Lu <hjl.tools@gmail.com>2021-08-17 19:35:48 -0700
committerH.J. Lu <hjl.tools@gmail.com>2021-09-19 13:51:35 -0700
commita93d9e03a31ec14405cb3a09aa95413b67067380 (patch)
tree532f865c7241b3cf363433272e5923c468ea2969 /elf/dl-reloc-static-pie.c
parent885762aa31d75de8b9fea4c0e2e372b582d4c548 (diff)
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Extend struct r_debug to support multiple namespaces [BZ #15971]
Glibc does not provide an interface for debugger to access libraries loaded in multiple namespaces via dlmopen. The current rtld-debugger interface is described in the file: elf/rtld-debugger-interface.txt under the "Standard debugger interface" heading. This interface only provides access to the first link-map (LM_ID_BASE). 1. Bump r_version to 2 when multiple namespaces are used. This triggers the GDB bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28236 2. Add struct r_debug_extended to extend struct r_debug into a linked-list, where each element correlates to an unique namespace. 3. Initialize the r_debug_extended structure. Bump r_version to 2 for the new namespace and add the new namespace to the namespace linked list. 4. Add _dl_debug_update to return the address of struct r_debug' of a namespace. 5. Add a hidden symbol, _r_debug_extended, for struct r_debug_extended. 6. Provide the symbol, _r_debug, with size of struct r_debug, as an alias of _r_debug_extended, for programs which reference _r_debug. This fixes BZ #15971. Reviewed-by: Florian Weimer <fweimer@redhat.com>
Diffstat (limited to 'elf/dl-reloc-static-pie.c')
-rw-r--r--elf/dl-reloc-static-pie.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/elf/dl-reloc-static-pie.c b/elf/dl-reloc-static-pie.c
index d5bd2f31e9..289651b341 100644
--- a/elf/dl-reloc-static-pie.c
+++ b/elf/dl-reloc-static-pie.c
@@ -51,7 +51,7 @@ _dl_relocate_static_pie (void)
ELF_DYNAMIC_RELOCATE (main_map, 0, 0, 0);
main_map->l_relocated = 1;
- /* Initialize _r_debug. */
+ /* Initialize _r_debug_extended. */
struct r_debug *r = _dl_debug_initialize (0, LM_ID_BASE);
r->r_state = RT_CONSISTENT;