[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 --- Comment #9 from commit-h...@freebsd.org --- A commit in branch stable/13 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=a763331899b4bb5502382ce1d5dfc8a35d857e27 commit a763331899b4bb5502382ce1d5dfc8a35d857e27 Author: Konstantin Belousov AuthorDate: 2022-09-21 13:55:44 + Commit: Konstantin Belousov CommitDate: 2022-10-13 04:46:01 + ldd: use direct exec mode unconditionally PR: 127276, 175339, 231926 (cherry picked from commit 9cabef3d146e9a844813b6bc8952d6cf2e9d45e5) usr.bin/ldd/ldd.c | 13 +++-- 1 file changed, 7 insertions(+), 6 deletions(-) -- You are receiving this mail because: You are the assignee for the bug.
[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 --- Comment #8 from commit-h...@freebsd.org --- A commit in branch main references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=9cabef3d146e9a844813b6bc8952d6cf2e9d45e5 commit 9cabef3d146e9a844813b6bc8952d6cf2e9d45e5 Author: Konstantin Belousov AuthorDate: 2022-09-21 13:55:44 + Commit: Konstantin Belousov CommitDate: 2022-10-06 15:50:26 + ldd: use direct exec mode unconditionally Trying to exec malformed or unusual binary, for instance, a non-FreeBSD ABI, or using a non-standard interpreter, might give unexpected outcome. Reported by:The UK's National Cyber Security Centre (NCSC) Reviewed by:emaste, markj, philip Discussed with: jhb Sponsored by: The FreeBSD Foundation admbug: 991 PR: 127276, 175339, 231926 MFC after: 1 week Differential revision: https://reviews.freebsd.org/D36650 usr.bin/ldd/ldd.c | 13 +++-- 1 file changed, 7 insertions(+), 6 deletions(-) -- You are receiving this mail because: You are the assignee for the bug.
[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 --- Comment #7 from commit-h...@freebsd.org --- A commit references this bug: Author: markj Date: Thu Nov 22 16:52:31 UTC 2018 New revision: 340769 URL: https://svnweb.freebsd.org/changeset/base/340769 Log: MFC r339653: Add an IMPLEMENTATION NOTES section to ldd.1. PR: 231926 Changes: _U stable/12/ stable/12/usr.bin/ldd/ldd.1 -- You are receiving this mail because: You are the assignee for the bug. ___ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 --- Comment #6 from commit-h...@freebsd.org --- A commit references this bug: Author: markj Date: Tue Oct 23 13:49:53 UTC 2018 New revision: 339653 URL: https://svnweb.freebsd.org/changeset/base/339653 Log: Add an IMPLEMENTATION NOTES section to ldd.1. PR: 231926 Reviewed by: emaste MFC after:1 month Changes: head/usr.bin/ldd/ldd.1 -- You are receiving this mail because: You are the assignee for the bug. ___ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 --- Comment #5 from Ed Maste --- (In reply to Mark Johnston from comment #4) Proposed man page addition looks good to me. Maybe also .Xr readelf. -- You are receiving this mail because: You are the assignee for the bug. ___ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 Mark Johnston changed: What|Removed |Added Resolution|FIXED |Not A Bug --- Comment #4 from Mark Johnston --- (In reply to Gleb Popov from comment #2) "Not a bug" makes more sense to me. (In reply to Ed Maste from comment #3) How about: diff --git a/usr.bin/ldd/ldd.1 b/usr.bin/ldd/ldd.1 index 5a06515ebd87..beff8450fdb6 100644 --- a/usr.bin/ldd/ldd.1 +++ b/usr.bin/ldd/ldd.1 @@ -57,6 +57,14 @@ option displays a verbose listing of the dynamic linking headers encoded in the executable. See the source code and include files for the definitive meaning of all the fields. +.Sh IMPLEMENTATION NOTES +.Nm +lists the dependencies of an executable by setting +.Xr rtld 1 +environment variables and running the executable in a child process. +If the executable is corrupt or invalid, +.Nm +may fail without providing any diagnostic error messages. .Sh EXAMPLES The following is an example of a shell pipeline which uses the .Fl f -- You are receiving this mail because: You are the assignee for the bug. ___ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 Ed Maste changed: What|Removed |Added CC||ema...@freebsd.org --- Comment #3 from Ed Maste --- (In reply to Gleb Popov from comment #2) Perhaps we should have a note in ldd(1) though mentioning this issue, as it can be surprising. Aside, you can find first-level shared obj dependencies via readelf -d. -- You are receiving this mail because: You are the assignee for the bug. ___ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 Gleb Popov changed: What|Removed |Added Resolution|--- |FIXED Status|New |Closed --- Comment #2 from Gleb Popov --- Given I see nothing sensible in the backtrace, it is highly likely that the crash occurs before main. Should I close this PR with "Not a bug" then? -- You are receiving this mail because: You are the assignee for the bug. ___ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 Mark Johnston changed: What|Removed |Added CC||ma...@freebsd.org --- Comment #1 from Mark Johnston --- ldd is very simple: it sets some magic rtld flags and exec()s the specified executable (or uses dlopen(RTLD_TRACE) for shared libs). For an executable, rtld will then print the dependencies and exit without actually calling into the executable. So a bug in the executable's code which causes a segfault should not be triggered when run by ldd, but if the executable itself is corrupted or invalid in some way, rtld may crash. This may or may not be a bug in rtld, depending on the nature of the corruption. In other words, if the executable is segfaulting before main() gets invoked, then the behaviour you're seeing is probably expected. To say for sure, we need to see exactly where the segfault is occurring. -- You are receiving this mail because: You are the assignee for the bug. ___ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
[Bug 231926] ldd can't operate on a segfaulting binary
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231926 Bug ID: 231926 Summary: ldd can't operate on a segfaulting binary Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: bin Assignee: b...@freebsd.org Reporter: arr...@freebsd.org When compiling lang/ghc port on FreeBSD 12, an executable named ghc-iserv-prof gets corrupted by some unrelated bug and segfaults when being launched. During `make stage-qa` the following command is called by qa.sh: env LD_LIBMAP_DISABLE=1 ldd -a /wrkdirs/usr/ports/lang/ghc/work/stage/usr/local/lib/ghc-8.4.3/bin/ghc-iserv-prof This command also results in a segfault with the same message: /wrkdirs/usr/ports/lang/ghc/work/stage/usr/local/lib/ghc-8.4.3/bin/ghc-iserv-prof: signal 11 I'm not sure if this is a bug in ldd, but I've got an impression that it shouldn't segfault even when given a broken executable. To reproduce on FreeBSD 12: # pkg install ghc # env LD_LIBMAP_DISABLE=1 ldd -a /usr/local/lib/ghc-8.4.3/bin/ghc-iserv-prof -- You are receiving this mail because: You are the assignee for the bug. ___ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
