On Sun, May 05, 2019 at 03:04:22PM +0500, ???? ??????? wrote: > Hello, > > I run fedora 30, it includes clang-8, I built haproxy using > > make CC=clang V=1 TARGET=$TARGET $FLAGS DEBUG_CFLAGS="-fsanitize=address > -ggdb" LDFLAGS="-fsanitize=address" > > when running reg-tests, the following is caught > > ==6340==ERROR: AddressSanitizer: global-buffer-overflow on address > 0x000000ab61c8 at pc 0x0000007360f5 bp 0x7ffc56ce9f90 sp 0x7ffc56ce9f88 > READ of size 8 at 0x000000ab61c8 thread T0 > #0 0x7360f4 (/home/ilia/haproxy/haproxy+0x7360f4) > #1 0x7f3952660f32 (/lib64/libc.so.6+0x23f32) > #2 0x434b7d (/home/ilia/haproxy/haproxy+0x434b7d) > > 0x000000ab61c8 is located 56 bytes to the left of global variable > '__initcb_486' defined in 'src/task.c:486:1' (0xab6200) of size 8 > 0x000000ab61c8 is located 0 bytes to the right of global variable > '__initcb_1865' defined in 'src/log.c:1865:1' (0xab61c0) of size 8 > SUMMARY: AddressSanitizer: global-buffer-overflow > (/home/ilia/haproxy/haproxy+0x7360f4)
This one is quite strange, it looks as if the linker had intentionally left holes in the init_* sections by aligning each pointer on 64 bytes. Maybe this is an artefact of using -fsanitize=address, though it seems a bit unlikely. Could you please run "objdump -h" on your haproxy executable with and without this build option ? I suspect we'll see "2**6" at the end of some init_* columns at least in one case. If so we may try to add "aligned(8)" or even "packed" to the attributes when declaring the initcalls. Thanks, Willy
