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* [Bug gdb/27133] New: Crash with set logging redirect and debugredirect @ 2020-12-31 7:08 nate at thatsmathematics dot com 2020-12-31 7:09 ` [Bug gdb/27133] " nate at thatsmathematics dot com ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: nate at thatsmathematics dot com @ 2020-12-31 7:08 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=27133 Bug ID: 27133 Summary: Crash with set logging redirect and debugredirect Product: gdb Version: HEAD Status: UNCONFIRMED Severity: normal Priority: P2 Component: gdb Assignee: unassigned at sourceware dot org Reporter: nate at thatsmathematics dot com Target Milestone: --- gdb crashes with SIGABRT when I run the following sequence of commands: set logging redirect on set logging debugredirect on set logging on Reproduced with latest HEAD (commit 391750c35548611) on x86_64-pc-linux-gnu (Ubuntu 20.04). Also reproduced with Ubuntu's 9.2.0 on x86_64 Ubuntu 20.04 and aarch64 Ubuntu 20.10 (where it gets SIGBUS instead). -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug gdb/27133] Crash with set logging redirect and debugredirect 2020-12-31 7:08 [Bug gdb/27133] New: Crash with set logging redirect and debugredirect nate at thatsmathematics dot com @ 2020-12-31 7:09 ` nate at thatsmathematics dot com 2021-01-13 12:11 ` sourceware at lancelotsix dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: nate at thatsmathematics dot com @ 2020-12-31 7:09 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=27133 Nate Eldredge <nate at thatsmathematics dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |nate at thatsmathematics dot com -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug gdb/27133] Crash with set logging redirect and debugredirect 2020-12-31 7:08 [Bug gdb/27133] New: Crash with set logging redirect and debugredirect nate at thatsmathematics dot com 2020-12-31 7:09 ` [Bug gdb/27133] " nate at thatsmathematics dot com @ 2021-01-13 12:11 ` sourceware at lancelotsix dot com 2021-01-27 22:16 ` cvs-commit at gcc dot gnu.org 2021-01-28 13:56 ` tromey at sourceware dot org 3 siblings, 0 replies; 5+ messages in thread From: sourceware at lancelotsix dot com @ 2021-01-13 12:11 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=27133 Lancelot SIX <sourceware at lancelotsix dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |sourceware at lancelotsix dot com --- Comment #1 from Lancelot SIX <sourceware at lancelotsix dot com> --- Created attachment 13118 --> https://sourceware.org/bugzilla/attachment.cgi?id=13118&action=edit Patch to fix the issue Hi, This comes dowm to a use after delete problem. The attach patch has been proposed to gdb-patches@. I cannot assign myself to the bug so I mainly attach this patch so no-one spends time investigating on this problem. Multiple implementations are possible to solve this problem, none entirely satisfactory to my taste. -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug gdb/27133] Crash with set logging redirect and debugredirect 2020-12-31 7:08 [Bug gdb/27133] New: Crash with set logging redirect and debugredirect nate at thatsmathematics dot com 2020-12-31 7:09 ` [Bug gdb/27133] " nate at thatsmathematics dot com 2021-01-13 12:11 ` sourceware at lancelotsix dot com @ 2021-01-27 22:16 ` cvs-commit at gcc dot gnu.org 2021-01-28 13:56 ` tromey at sourceware dot org 3 siblings, 0 replies; 5+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2021-01-27 22:16 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=27133 --- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Lancelot SIX <lsix@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=59b59f08f6448a77730c8d8dde5871f1bf6806d0 commit 59b59f08f6448a77730c8d8dde5871f1bf6806d0 Author: Lancelot SIX <lsix@lancelotsix.com> Date: Fri Jan 1 20:11:28 2021 +0000 Avoid use after free with logging and debug redirect. This patch addresses PR gdb/27133. Before it, the following succession of commands would cause gdb to crash: set logging redirect on set logging debugredirect on set logging on The problem eventually comes down to a use after free. The function cli_interp_base::set_logging is called with a unique_ptr argument that holds a pointer to the redirection file. In the problematic use case, no-one ever took ownership of that pointer (as far as unique_ptr is concerned), so the call to its dtor at the end of the function causes the file object to be deleted. Any later use of the pointer to the redirection file is therefore an error. This patch ensures that the unique_ptr is released when required (so it does not assume ownership anymore). The internal logic of cli_interp_base::set_logging takes care of freeing the ui_file when it is not necessary anymore using the saved_output.file_to_delete field. gdb/ChangeLog: PR gdb/27133 * cli/cli-interp.c (cli_interp_base::set_logging): Ensure the unique_ptr is released when the wrapped pointer is kept for later use. gdb/testsuite/ChangeLog: PR gdb/27133 * gdb.base/ui-redirect.exp: Add test case that ensures that redirecting both logging and debug does not cause gdb to crash. -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug gdb/27133] Crash with set logging redirect and debugredirect 2020-12-31 7:08 [Bug gdb/27133] New: Crash with set logging redirect and debugredirect nate at thatsmathematics dot com ` (2 preceding siblings ...) 2021-01-27 22:16 ` cvs-commit at gcc dot gnu.org @ 2021-01-28 13:56 ` tromey at sourceware dot org 3 siblings, 0 replies; 5+ messages in thread From: tromey at sourceware dot org @ 2021-01-28 13:56 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=27133 Tom Tromey <tromey at sourceware dot org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |tromey at sourceware dot org Target Milestone|--- |11.1 Resolution|--- |FIXED Status|UNCONFIRMED |RESOLVED --- Comment #3 from Tom Tromey <tromey at sourceware dot org> --- Fixed. -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-01-28 13:56 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-12-31 7:08 [Bug gdb/27133] New: Crash with set logging redirect and debugredirect nate at thatsmathematics dot com 2020-12-31 7:09 ` [Bug gdb/27133] " nate at thatsmathematics dot com 2021-01-13 12:11 ` sourceware at lancelotsix dot com 2021-01-27 22:16 ` cvs-commit at gcc dot gnu.org 2021-01-28 13:56 ` tromey at sourceware dot org
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