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Enable the msan compilation option and compile the tar1.34 in clang.(https://clang.llvm.org/docs/MemorySanitizer.html) msan detects uninitialized variables in tar1.34 #/home/tar-1.34/src/tar -cf /home/new.tar /home/lost+found/ /home/tar-1.34/src/tar: Removing leading ??/' from member names ==832799==MemorySanitizer: use-of-uninitialized-value #0 0x4d3411 (/home/tar-1.34/src/tar+0x4d3411) #1 Ox4cdfb7 (/home/tar-1.34/src/tar+0x4cdfb7) #2 0x54bbb7 (/home/tar-1.34/src/tar+0x54bbb7) #3 Ox7ff1320ab20f (/usr/1ib64/libc.so.6+0x2d20f) #4 Ox7ff1320ab2bb = (/usr/1ib64/libc.so.6+0x2d2bb) #5 0x42b9a4 (/home/tar-1.34/src/tar+0x42b9a4) Uninitialized value was created by an allocation of ??final_stat' in the stack frame of function ??dump filed" #0 0x4cee90 (/home/tar-1.34/src/tar+0x4cee90) SUMMARY: MemorySanitizer: use-of-uninitialized-value (/home/tar-1.34/src/tar+0x4d3411) Exiting After initialization is added to the stbuf structure, recompile the stbuf structure and run the test. The corresponding MSAN alarm is cleared. src/system.c | 1 + 1 file changed, 1 insertion(+) diff --git a/src/system.c b/src/system.c index 2988ed08..76db1f38 100644 --- a/src/system.c +++ b/src/system.c @@ -283,6 +283,7 @@ static int is_regular_file (const char *name) { struct stat stbuf; + memset(&stbuf,0,sizeof(struct stat)); if (stat (name, &stbuf) == 0) return S_ISREG (stbuf.st_mode); 2773414454 2773414...@qq.com
0001-Initializing-variable-struct-stat-stbuf-memory.patch.txt
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