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authorMaciej W. Rozycki <macro@mips.com>2018-07-05 18:06:43 +0100
committerMaciej W. Rozycki <macro@mips.com>2018-07-05 18:06:43 +0100
commit9449a295ad7e30f3a787421cb22aaa475f950549 (patch)
treedc51ac41c40921f14229dd25cb3d98bb0141d4cf /NEWS
parentd6da5cb6a8e0e8a9ce92b7d951a254cf325248d7 (diff)
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libc-abis: Define ABSOLUTE ABI [BZ #19818][BZ #23307]
Define a new ABSOLUTE ABI for static linker's use with EI_ABIVERSION
where correct absolute (SHN_ABS) symbol run-time load semantics is
required.  This way it can be ensured at static link time that a program
or DSO will not suffer from previous semantics where absolute symbols
were relocated by the base address, or symbols whose `st_value' is zero
silently ignored leading to a confusing "undefined symbol" error message
at load time, and instead "ELF file ABI version invalid" is printed with
old dynamic loaders, making it clear that there is an ABI version
incompatibility.

	[BZ #19818]
	[BZ #23307]
	* libc-abis (ABSOLUTE): New ABI.
	* sysdeps/unix/sysv/linux/mips/libc-abis (ABSOLUTE): New ABI.
	* NEWS: Mention the new ABI.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'NEWS')
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diff --git a/NEWS b/NEWS
index 5d253910b5..716d11cda1 100644
--- a/NEWS
+++ b/NEWS
@@ -9,6 +9,13 @@ Version 2.28
 
 Major new features:
 
+* The GNU C Library now has correct support for ABSOLUTE symbols
+  (SHN_ABS-relative symbols).  Previously such ABSOLUTE symbols were
+  relocated incorrectly or in some cases discarded.  The GNU linker can
+  make use of the newer semantics, but it must communicate it to the
+  dynamic loader by setting the ELF file's identification (EI_ABIVERSION
+  field) to indicate such support is required.
+
 * Unicode 11.0.0 Support: Character encoding, character type info, and
   transliteration tables are all updated to Unicode 11.0.0, using
   generator scripts contributed by Mike FABIAN (Red Hat).