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PettitWesley
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Jun 16, 2021
output_thread patch #1 : pipe creation is platform dependent, in unixes it's achieved through the pipe syscall but in windows it's a socket pair created through libevent which means instead of read/write we need to use recv/send which was already abstracted through flb_pipe_(r/w). output_thread patch #2 : in windows the SOCKET data type is defined as an UINT_PTR which means in 64 bit operating systems it's an 8 byte number instead of 4. libevent abstracts this through the evutil_socket_t data type which in turn is abstracted using the flb_pipefd_t data type in fluent bit. The problem comes to play when calling mk_event_channel_create which receives 2 int pointers to return both pipe endpoints. This means there are 2 possible bugs (one of which was happening and the other is not really a concern I think) : Since mk_event_channel_create was only modifying the low part of the elements in the ch_parent_events array and the structure was not zeroed when allocated, the high parts of those 64 bit members contained garbage which caused any winsock calls to return error 10038 (not a socket). That's the reason why I added a memset call in line 421. There is still a possible issue with mk_event_channel_create which we should fix by moving our platform dependent data type to mk_lib and defining our flb local data types to those if need be (for consistency). Signed-off-by: Leonardo Alminana <leonardo@calyptia.com>
PettitWesley
pushed a commit
that referenced
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Jun 17, 2021
output_thread patch #1 : pipe creation is platform dependent, in unixes it's achieved through the pipe syscall but in windows it's a socket pair created through libevent which means instead of read/write we need to use recv/send which was already abstracted through flb_pipe_(r/w). output_thread patch #2 : in windows the SOCKET data type is defined as an UINT_PTR which means in 64 bit operating systems it's an 8 byte number instead of 4. libevent abstracts this through the evutil_socket_t data type which in turn is abstracted using the flb_pipefd_t data type in fluent bit. The problem comes to play when calling mk_event_channel_create which receives 2 int pointers to return both pipe endpoints. This means there are 2 possible bugs (one of which was happening and the other is not really a concern I think) : Since mk_event_channel_create was only modifying the low part of the elements in the ch_parent_events array and the structure was not zeroed when allocated, the high parts of those 64 bit members contained garbage which caused any winsock calls to return error 10038 (not a socket). That's the reason why I added a memset call in line 421. There is still a possible issue with mk_event_channel_create which we should fix by moving our platform dependent data type to mk_lib and defining our flb local data types to those if need be (for consistency). Signed-off-by: Leonardo Alminana <leonardo@calyptia.com>
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PettitWesley
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Aug 14, 2024
The tls variable for out_flush_params is not initialized as the
flb_start function is not called during the dry run. Call flb_init
directly and then shutdown the engine.
configuration test is successful
=================================================================
==63633==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x0001f71b3ac0 in thread T0
#0 0x103c9f260 in wrap_free+0x98 (libclang_rt.asan_osx_dynamic.dylib:arm64e+0x53260)
#1 0x100179d9c in flb_free flb_mem.h:127
#2 0x10017f4a0 in flb_output_exit flb_output.c:481
#3 0x1001cb038 in flb_engine_shutdown flb_engine.c:1119
#4 0x10010d45c in flb_destroy flb_lib.c:240
#5 0x100008c40 in flb_main fluent-bit.c:1348
#6 0x10000c644 in main fluent-bit.c:1456
#7 0x18f11e0dc (<unknown module>)
frame #6: 0x000000010017f4a4 fluent-bit`flb_output_exit(config=0x0000000102b00200) at flb_output.c:481:9
478
479 params = FLB_TLS_GET(out_flush_params);
480 if (params) {
-> 481 flb_free(params);
482 }
483 }
Signed-off-by: Holger Hans Peter Freyther <holger@freyther.de>
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