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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-08-17 19:35:48 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-09-19 13:51:35 -0700 |
| commit | a93d9e03a31ec14405cb3a09aa95413b67067380 (patch) | |
| tree | 532f865c7241b3cf363433272e5923c468ea2969 /csu | |
| parent | 885762aa31d75de8b9fea4c0e2e372b582d4c548 (diff) | |
| download | glibc-a93d9e03a31ec14405cb3a09aa95413b67067380.zip glibc-a93d9e03a31ec14405cb3a09aa95413b67067380.tar.gz glibc-a93d9e03a31ec14405cb3a09aa95413b67067380.tar.bz2 | |
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 'csu')
| -rw-r--r-- | csu/Makefile | 3 | ||||
| -rw-r--r-- | csu/rtld-sizes.sym | 6 |
2 files changed, 9 insertions, 0 deletions
diff --git a/csu/Makefile b/csu/Makefile index 3054329..e2390e4 100644 --- a/csu/Makefile +++ b/csu/Makefile @@ -88,6 +88,9 @@ endif before-compile += $(objpfx)abi-tag.h generated += abi-tag.h +# Put it here to generate it earlier. +gen-as-const-headers += rtld-sizes.sym + # These are the special initializer/finalizer files. They are always the # first and last file in the link. crti.o ... crtn.o define the global # "functions" _init and _fini to run the .init and .fini sections. diff --git a/csu/rtld-sizes.sym b/csu/rtld-sizes.sym new file mode 100644 index 0000000..13924d5 --- /dev/null +++ b/csu/rtld-sizes.sym @@ -0,0 +1,6 @@ +#include <link.h> + +-- +R_DEBUG_SIZE sizeof (struct r_debug) +R_DEBUG_EXTENDED_SIZE sizeof (struct r_debug_extended) +R_DEBUG_EXTENDED_ALIGN __alignof (struct r_debug_extended) |