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Bug 2028146 - [RHEL 7] assertion when using 'xx' arguments to strace [rhel 7.9.z]
Summary: [RHEL 7] assertion when using 'xx' arguments to strace [rhel 7.9.z]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: strace
Version: 7.9
Hardware: All
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Eugene Syromiatnikov
QA Contact: Jesus Checa
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-12-01 15:20 UTC by Paulo Andrade
Modified: 2024-01-19 04:25 UTC (History)
5 users (show)

Fixed In Version: strace-4.24-7.el7_9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 2028157 2028158 2028163 2028166 (view as bug list)
Environment:
Last Closed: 2023-08-29 09:29:21 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-104470 0 None None None 2021-12-01 15:28:27 UTC
Red Hat Product Errata RHBA-2023:4820 0 None None None 2023-08-29 09:29:23 UTC

Description Paulo Andrade 2021-12-01 15:20:17 UTC 
Backtrace:

...
(gdb) bt
#0  die () at strace.c:313
#1  0x000000000040d883 in error_msg_and_die (fmt=fmt@entry=0x4640e8 "%s: got unexpected return value %d for snprintf(buf, %zu, %s)") at error_prints.c:74
#2  0x000000000042152a in xsnprintf_ (str=0x6f9a20 <res.6552> "if_nametoindex(\"\\x62\\x6c\\x69\\x6e\\x6", size=36, func=0x484ede <__func__.6555> "get_ifname", argstr=0x484eb0 "(\"if_nametoindex(\" \"%s\" \")\"), name_quoted_buf", 
    format=0x484e9b "if_nametoindex(%s)", format=0x484e9b "if_nametoindex(%s)", argstr=0x484eb0 "(\"if_nametoindex(\" \"%s\" \")\"), name_quoted_buf", func=0x484ede <__func__.6555> "get_ifname", size=36, 
    str=0x6f9a20 <res.6552> "if_nametoindex(\"\\x62\\x6c\\x69\\x6e\\x6") at xstring.h:36
#3  0x0000000000421596 in get_ifname (ifindex=6) at print_ifindex.c:31
#4  print_ifindex (ifindex=6) at print_ifindex.c:44
#5  0x0000000000427a7d in decode_ndmsg (tcp=0x712370, nlmsghdr=<optimized out>, family=<optimized out>, addr=140215372832688, len=60) at rtnl_neigh.c:86
#6  0x000000000041c5c8 in decode_netlink_route (tcp=tcp@entry=0x712370, nlmsghdr=nlmsghdr@entry=0x7fffffffe0b0, addr=addr@entry=140215372832688, len=len@entry=60) at netlink_route.c:120
...

  The problem in frame #3:

(gdb) f 3
#3  0x0000000000421596 in get_ifname (ifindex=6) at print_ifindex.c:31
31			xsprintf(res, INI_PFX "%s" INI_SFX, name_quoted_buf);
(gdb) info local
name_buf = "blink1\000\000\000\000\000\000\000\000\000"
name_quoted_buf = "\"\\x62\\x6c\\x69\\x6e\\x"
res = "if_nametoindex(\"\\x62\\x6c\\x69\\x6e\\x6"
res = "if_nametoindex(\"\\x62\\x6c\\x69\\x6e\\x6"
__func__ = "get_ifname"

  The fix could be to check the 'xflag' global variable and not print in hex
the name, but since all strings are printed in hex, the most likely fix should
be to rework the code in print_ifindex.c. This appears to be buggy:

# define IFNAME_QUOTED_SZ (sizeof(IFNAMSIZ) * 4 + 3)

as it most likely should mean:

# define IFNAME_QUOTED_SZ (IFNAMSIZ * 4 + 3)

because, otherwise it should result in:

sizeof(IFNAMSIZ) that is the same as sizeof(16) and return 4 (as literal
16 should default to type int). So, the code likely did already prepare for
printing in hex, but due to a mistake, used sizeof.
Comment 3 Eugene Syromiatnikov 2021-12-02 21:48:57 UTC 
Thank you for the bug report.  The issue is fixed upstream in strace commit v5.15~1[1].

[1] https://gitlab.com/strace/strace/-/commit/e27b0677
Comment 13 errata-xmlrpc 2023-08-29 09:29:21 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (strace bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:4820
Comment 14 Red Hat Bugzilla 2024-01-19 04:25:05 UTC 
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days
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