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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: Khem Raj <khem.raj@oss.qualcomm.com>
This commit is contained in:
Preeti Sachan
2026-08-11 09:53:53 +05:30
committed by Khem Raj
parent b6d57134fc
commit 85f8b2db13
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"