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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 /NEWS
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 'NEWS')
-rw-r--r--NEWS11
1 files changed, 10 insertions, 1 deletions
diff --git a/NEWS b/NEWS
index 838381f562..3e3c074238 100644
--- a/NEWS
+++ b/NEWS
@@ -9,6 +9,9 @@ Version 2.35
Major new features:
+* Bump r_version in the debugger interface to 2 and add a new field,
+ r_next, support multiple namespaces.
+
* Support for the C.UTF-8 locale has been added to glibc. The locale
supports full code-point sorting for all valid Unicode code points. A
limitation in the framework for fnmatch, regexec, and regcomp requires
@@ -28,7 +31,13 @@ Major new features:
Deprecated and removed features, and other changes affecting compatibility:
- [Add deprecations, removals and changes affecting compatibility here]
+* The r_version update in the debugger interface makes the glibc binary
+ incompatible with GDB binaries built without the following commits:
+
+ c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
+ 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
+
+ when audit modules or dlmopen are used.
Changes to build and runtime requirements: