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* [Bug shlibs/28236] New: Don't assume r_ldsomap if r_version > 1 in debugger interface
@ 2021-08-16 22:08 hjl.tools at gmail dot com
2021-08-17 3:31 ` [Bug shlibs/28236] " carlos at redhat dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2021-08-16 22:08 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28236
Bug ID: 28236
Summary: Don't assume r_ldsomap if r_version > 1 in debugger
interface
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: shlibs
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
There are
static CORE_ADDR
solib_svr4_r_ldsomap (struct svr4_info *info)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
enum bfd_endian byte_order = type_byte_order (ptr_type);
ULONGEST version = 0;
try
{
/* Check version, and return zero if `struct r_debug' doesn't have
the r_ldsomap member. */
version
= read_memory_unsigned_integer (info->debug_base +
lmo->r_version_offset,
lmo->r_version_size, byte_order);
}
catch (const gdb_exception_error &ex)
{
exception_print (gdb_stderr, ex);
}
if (version < 2 || lmo->r_ldsomap_offset == -1)
return 0;
return read_memory_typed_address (info->debug_base + lmo->r_ldsomap_offset,
ptr_type);
}
glibc is planning to bump r_version to support multiple namespaces. But
there is no r_ldsomap when r_version is bumped to 2.
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* [Bug shlibs/28236] Don't assume r_ldsomap if r_version > 1 in debugger interface
2021-08-16 22:08 [Bug shlibs/28236] New: Don't assume r_ldsomap if r_version > 1 in debugger interface hjl.tools at gmail dot com
@ 2021-08-17 3:31 ` carlos at redhat dot com
2021-08-17 14:14 ` hjl.tools at gmail dot com
2021-08-17 14:15 ` hjl.tools at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: carlos at redhat dot com @ 2021-08-17 3:31 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28236
Carlos O'Donell <carlos at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |carlos at redhat dot com
--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to H.J. Lu from comment #0)
> glibc is planning to bump r_version to support multiple namespaces. But
> there is no r_ldsomap when r_version is bumped to 2.
Agreed. The r_ldsomap is only present in Solaris (part of librtld_db), and
should never be accessed for Linux. The entire layout of r_debug is
OS-specific.
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* [Bug shlibs/28236] Don't assume r_ldsomap if r_version > 1 in debugger interface
2021-08-16 22:08 [Bug shlibs/28236] New: Don't assume r_ldsomap if r_version > 1 in debugger interface hjl.tools at gmail dot com
2021-08-17 3:31 ` [Bug shlibs/28236] " carlos at redhat dot com
@ 2021-08-17 14:14 ` hjl.tools at gmail dot com
2021-08-17 14:15 ` hjl.tools at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2021-08-17 14:14 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28236
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |12.1
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GDB 12 by
commit c0154a4a21a3aed01ef53877af05cf0109a0b124
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Aug 16 16:17:25 2021 -0700
gdb: Don't assume r_ldsomap when r_version > 1 on Linux
The r_ldsomap field is specific to Solaris (part of librtld_db), and
should never be accessed for Linux. glibc is planning to add a field
to support multiple namespaces. But there will be no r_ldsomap when
r_version is bumped to 2. Add linux_[ilp32|lp64]_fetch_link_map_offsets
to set r_ldsomap_offset to -1 and use them for Linux targets.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28236
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* [Bug shlibs/28236] Don't assume r_ldsomap if r_version > 1 in debugger interface
2021-08-16 22:08 [Bug shlibs/28236] New: Don't assume r_ldsomap if r_version > 1 in debugger interface hjl.tools at gmail dot com
2021-08-17 3:31 ` [Bug shlibs/28236] " carlos at redhat dot com
2021-08-17 14:14 ` hjl.tools at gmail dot com
@ 2021-08-17 14:15 ` hjl.tools at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2021-08-17 14:15 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28236
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed.
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2021-08-16 22:08 [Bug shlibs/28236] New: Don't assume r_ldsomap if r_version > 1 in debugger interface hjl.tools at gmail dot com
2021-08-17 3:31 ` [Bug shlibs/28236] " carlos at redhat dot com
2021-08-17 14:14 ` hjl.tools at gmail dot com
2021-08-17 14:15 ` hjl.tools at gmail dot com
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