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gdbserver: Check r_version < 1 for Linux debugger interface

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Update gdbserver to check r_version < 1 instead of r_version != 1 so
that r_version can be bumped for a new field in the glibc debugger
interface to support multiple namespaces.  Since so far, the gdbserver
only reads fields defined for r_version == 1, it is compatible with
r_version >= 1.

All future glibc debugger interface changes will be backward compatible.
If there is ever the need for backward incompatible change to the glibc
debugger interface, a new DT_XXX element will be provided to access the
new incompatible interface.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=11839
This commit is contained in:
H.J. Lu 2021-08-16 08:18:18 -07:00
parent c9fed6655f
commit 4eb629d50d
1 changed files with 1 additions and 1 deletions
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2
gdbserver/linux-low.cc
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@ -6845,7 +6845,7 @@ linux_process_target::qxfer_libraries_svr4 (const char *annex,
if (linux_read_memory (priv->r_debug + lmo->r_version_offset,
(unsigned char *) &r_version,
sizeof (r_version)) != 0
|| r_version != 1)
|| r_version < 1)
{
warning ("unexpected r_debug version %d", r_version);
}