Description
Describe the bug
The background of the problem is #5095
Affected OS
- Windows
- Linux
- macOS
- Other (specify below)
Additional OS information
Linux system: Centos8
Kernel version: 4.18
cmake version: 3.20
msquic version: 2.4.7
Linux system: Ubuntu22.04
Kernel version: 6.5
cmake version: 3.20
msquic version: 2.4.7
MsQuic version
main
Steps taken to reproduce bug
more info can see in #5095
Compilation stage
The only difference between the compilation in CentOS and that in Ubuntu is
-- Looking for UDP_SEGMENT
-- Looking for UDP_SEGMENT - not found
Its location in the CMakeList
check_symbol_exists(UDP_SEGMENT netinet/udp.h HAS_UDP_SEGMENT)
The commands I used during the runtime stage are
./secnetper -port:8500
./secnetper -target:localhost -port:8500 -cc:bbr -exec:maxtput -up:134217728 -conns:1 -streams:1 -ptput:1
Expected behavior
I compiled the msquic-2.4.7 source code on the CentOS8 system. After configuring the environment, the compilation was successful . Subsequently, an error occurred during local runtime. When I copied the same code to the Ubuntu system, it ran successfully without errors.
Actual outcome
more info can see in #5095
Additional details
Through experiments, msquic will by default get the UDP_SEGMENT macro from the /usr/include/netinet/udp.h file (this is the path in both Ubuntu and CentOS8), which is defined as
#define UDP_SEGMENT 103
As shown in the CMakeList filecheck_symbol_exists(UDP_SEGMENT netinet/udp.h HAS_UDP_SEGMENT)
msquic uses the UDP_SEGMENT in the./src/platform/datapath_epoll.c file.
In CentOS 8, the /usr/include/netinet/udp.hfile does not contain UDP_SEGMENT.
the UDP_SEGMENT macro is defined in
/usr/include/linux/udp.h
/usr/src/kernels/4.18.0-348.7.1.el8_5.x86_64/include/uapi/linux/udp.h
This results in the UDP_SEGMENT not being recognizable during the compilation and runtime phases in CentOS8.
Moreover, the code of the msquic-2.4.7 version has a bug in the logic for handling the absence of UDP_SEGMENT, which leads to a memory out-of-bounds error during the runtime phase.
When I disabled the UDP_SEGMENT macro in the Ubuntu system (by adding #undef UDP_SEGMENT at the beginning of datapath_epoll.c), the same error occurred in Ubuntu! The following attachment contains the detailed error information after disabling the UDP_SEGMENT.