DPDK sanitizer seems cannot detect the overflow issue sometimes

[halsey.p...@longsys.com]

Dear All,

I would try to detect the illegal memory access issues in my App based on DPDK, 
so I add some codes based on several overflow scenario to check if it is 
detected in DPDK standalone project.

It seems that DPDK santizer cannot find the overflow issue below,

I add some code into examples/helloworld/main.c as below,

char*p = (char*)rte_zmalloc(NULL, 9, 4096);

if(p != NULL)
{
        p = p + 32;
        *p = 'A‘  // should be overflow here
}

But there is no any sanitzer output after dpdk-helloworld exit.

BTW, DPDK sanitzer can detect the overflow below,


char*p = (char*)rte_zmalloc(NULL, 9, 4096);

if(p != NULL)
{
        p[9] = 'A‘  // can be detected
}

Unfortunately, DPDK cannot detect the overflow when update the code to below,
        p[32] = 'A' // cannot be detected


Version: DPDK 21.11.1
OS: Fedora 32
Build: meson setup -Dbuildtype=debug -Db_lundef=false -Db_sanitize=address 
-Dexamples=hellowowrld build

Is it a known issue? I am confused with this. 
Could you provide some info? Thanks.

Best Regards
Halsey Pian