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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/tools/perf/util/bpf-prologue.c
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@@ -8,12 +8,12 @@
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  */
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 #include <bpf/libbpf.h>
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-#include "perf.h"
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 #include "debug.h"
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 #include "bpf-loader.h"
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 #include "bpf-prologue.h"
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 #include "probe-finder.h"
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 #include <errno.h>
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+#include <stdlib.h>
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 #include <dwarf-regs.h>
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 #include <linux/filter.h>
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@@ -142,7 +142,8 @@
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 gen_read_mem(struct bpf_insn_pos *pos,
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 	     int src_base_addr_reg,
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 	     int dst_addr_reg,
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-	     long offset)
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+	     long offset,
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+	     int probeid)
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 {
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 	/* mov arg3, src_base_addr_reg */
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 	if (src_base_addr_reg != BPF_REG_ARG3)
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@@ -159,7 +160,7 @@
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 		ins(BPF_MOV64_REG(BPF_REG_ARG1, dst_addr_reg), pos);
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 	/* Call probe_read  */
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-	ins(BPF_EMIT_CALL(BPF_FUNC_probe_read), pos);
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+	ins(BPF_EMIT_CALL(probeid), pos);
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 	/*
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 	 * Error processing: if read fail, goto error code,
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 	 * will be relocated. Target should be the start of
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@@ -241,7 +242,7 @@
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 gen_prologue_slowpath(struct bpf_insn_pos *pos,
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 		      struct probe_trace_arg *args, int nargs)
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 {
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-	int err, i;
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+	int err, i, probeid;
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 	for (i = 0; i < nargs; i++) {
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 		struct probe_trace_arg *arg = &args[i];
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@@ -276,11 +277,16 @@
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 				stack_offset), pos);
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 		ref = arg->ref;
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+		probeid = BPF_FUNC_probe_read_kernel;
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 		while (ref) {
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 			pr_debug("prologue: arg %d: offset %ld\n",
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 				 i, ref->offset);
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+
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+			if (ref->user_access)
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+				probeid = BPF_FUNC_probe_read_user;
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+
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 			err = gen_read_mem(pos, BPF_REG_3, BPF_REG_7,
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-					   ref->offset);
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+					   ref->offset, probeid);
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 			if (err) {
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 				pr_err("prologue: failed to generate probe_read function call\n");
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 				goto errout;