* [Bug debuginfod/31248] New: debuginfod_find_* may return fd with file-offset at end
@ 2024-01-16 1:39 fche at redhat dot com
2024-01-16 12:47 ` [Bug debuginfod/31248] " mark at klomp dot org
2024-01-16 21:47 ` fche at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: fche at redhat dot com @ 2024-01-16 1:39 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=31248
Bug ID: 31248
Summary: debuginfod_find_* may return fd with file-offset at
end
Product: elfutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: debuginfod
Assignee: unassigned at sourceware dot org
Reporter: fche at redhat dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
During the srcfiles test case diagnosis, studying the reason for occasional
0-length files, found something funky about the debuginfod_find_FOO api.
It appears possible for first-time-downloaded files to result in FDs that were
freshly written into by curl, with the file offset positioned right at the end.
We should lseek(2) to the front. Clients would expect to be able to read it,
as opposed to an insta-EOF.
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* [Bug debuginfod/31248] debuginfod_find_* may return fd with file-offset at end
2024-01-16 1:39 [Bug debuginfod/31248] New: debuginfod_find_* may return fd with file-offset at end fche at redhat dot com
@ 2024-01-16 12:47 ` mark at klomp dot org
2024-01-16 21:47 ` fche at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: mark at klomp dot org @ 2024-01-16 12:47 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=31248
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mark at klomp dot org
--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
Frank has a fix here, on Housam's try branch, which looks reasonable to me:
https://sourceware.org/cgit/elfutils/commit/?h=users/halamour/try-pr30991&id=c742bdc6815e64f64a37f06244cce723b2c817ea
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* [Bug debuginfod/31248] debuginfod_find_* may return fd with file-offset at end
2024-01-16 1:39 [Bug debuginfod/31248] New: debuginfod_find_* may return fd with file-offset at end fche at redhat dot com
2024-01-16 12:47 ` [Bug debuginfod/31248] " mark at klomp dot org
@ 2024-01-16 21:47 ` fche at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fche at redhat dot com @ 2024-01-16 21:47 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=31248
Frank Ch. Eigler <fche at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #2 from Frank Ch. Eigler <fche at redhat dot com> ---
commit 7554d41cd3784a321751c9ac430ad123f6c8cc1e (HEAD -> master3, origin/main)
gpg: Signature made Tue 16 Jan 2024 04:46:13 PM EST
gpg: using RSA key 4DD136490411C0A42B28844F258B6EFA0F209D24
gpg: Good signature from "Frank Ch. Eigler <fche@elastic.org>" [ultimate]
Author: Frank Ch. Eigler <fche@redhat.com>
Date: Mon Jan 15 21:21:24 2024 -0500
PR31248: debuginfod_find_*: lseek to the front on returned fds
Previous code could return a fd that had its file-offset left at the
place where libcurl last used it, namely at the end of the freshly
downloaded file. Not good if a client just wants to read it right
away! We now ensure (and document) that the fd is pointed to the
beginning of the file.
Signed-off-by: Frank Ch. Eigler <fche@redhat.com>
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