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libfastjson: fix rsyslogd segfault crash at load

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libfastjson is missing an explicit link dependency on the math library (libm),
which triggers GNU Indirect Function (IFUNC) resolution failure at runtime.

libfastjson internally calls the modf() math function but modf is optimized via
glibc's IFUNC mechanism. Because libfastjson was compiled without -lm, the dynamic
linker (ld.so) cannot safely resolve this dynamic IFUNC redirection, causing rsyslogd
to immediately crash with a segfault error.

rsyslogd boot error:
| starting rsyslogd ... /usr/sbin/rsyslogd: Relink `/usr/lib64/libfastjson.so.4'
| with  `/lib64/libm.so.6' for IFUNC symbol `modf'
| rsyslogd[1311]: segfault at 9c ip

Signed-off-by: Preeti Sachan <preeti.sachan@intel.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
This commit is contained in:
Preeti Sachan
2026-08-11 09:46:09 +05:30
committed by Anuj Mittal
parent 6a8a0b46d6
commit 3463973c5e
1 changed files with 1 additions and 0 deletions
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meta-oe/recipes-extended/rsyslog/libfastjson_1.2304.0.bb
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@@ -10,6 +10,7 @@ SRC_URI = "git://github.com/rsyslog/libfastjson.git;protocol=https;branch=master
SRCREV = "3a8402c1de7c7747c95229db26d8d32fb85a7a52"
EXTRA_OECONF += "LIBS='-lm'"
CVE_PRODUCT = "rsyslog:libfastjson"