7089f85a9e
This exercises the newly added dynsym symbol versioning logics.
Now we accept symbols in form of func, func@LIB_VERSION or
func@@LIB_VERSION.
The test rely on liburandom_read.so. For liburandom_read.so, we have:
$ nm -D liburandom_read.so
w __cxa_finalize@GLIBC_2.17
w __gmon_start__
w _ITM_deregisterTMCloneTable
w _ITM_registerTMCloneTable
0000000000000000 A LIBURANDOM_READ_1.0.0
0000000000000000 A LIBURANDOM_READ_2.0.0
000000000000081c T urandlib_api@@LIBURANDOM_READ_2.0.0
0000000000000814 T urandlib_api@LIBURANDOM_READ_1.0.0
0000000000000824 T urandlib_api_sameoffset@LIBURANDOM_READ_1.0.0
0000000000000824 T urandlib_api_sameoffset@@LIBURANDOM_READ_2.0.0
000000000000082c T urandlib_read_without_sema@@LIBURANDOM_READ_1.0.0
00000000000007c4 T urandlib_read_with_sema@@LIBURANDOM_READ_1.0.0
0000000000011018 D urandlib_read_with_sema_semaphore@@LIBURANDOM_READ_1.0.0
For `urandlib_api`, specifying `urandlib_api` will cause a conflict because
there are two symbols named urandlib_api and both are global bind.
For `urandlib_api_sameoffset`, there are also two symbols in the .so, but
both are at the same offset and essentially they refer to the same function
so no conflict.
Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20230918024813.237475-4-hengqi.chen@gmail.com
61 lines
1 KiB
C
61 lines
1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2023 Hengqi Chen */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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pid_t my_pid = 0;
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int test1_result = 0;
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int test2_result = 0;
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int test3_result = 0;
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int test4_result = 0;
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SEC("uprobe/./liburandom_read.so:urandlib_api_sameoffset")
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int BPF_UPROBE(test1)
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{
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pid_t pid = bpf_get_current_pid_tgid() >> 32;
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if (pid != my_pid)
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return 0;
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test1_result = 1;
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return 0;
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}
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SEC("uprobe/./liburandom_read.so:urandlib_api_sameoffset@LIBURANDOM_READ_1.0.0")
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int BPF_UPROBE(test2)
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{
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pid_t pid = bpf_get_current_pid_tgid() >> 32;
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if (pid != my_pid)
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return 0;
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test2_result = 1;
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return 0;
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}
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SEC("uretprobe/./liburandom_read.so:urandlib_api_sameoffset@@LIBURANDOM_READ_2.0.0")
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int BPF_URETPROBE(test3, int ret)
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{
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pid_t pid = bpf_get_current_pid_tgid() >> 32;
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if (pid != my_pid)
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return 0;
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test3_result = ret;
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return 0;
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}
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SEC("uprobe")
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int BPF_UPROBE(test4)
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{
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pid_t pid = bpf_get_current_pid_tgid() >> 32;
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if (pid != my_pid)
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return 0;
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test4_result = 1;
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return 0;
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}
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