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fprobe: Pass entry_data to handlers

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[ Upstream commit 76d0de5729 ]

Pass the private entry_data to the entry and exit handlers so that
they can share the context data, something like saved function
arguments etc.
User must specify the private entry_data size by @entry_data_size
field before registering the fprobe.

Link: https://lkml.kernel.org/r/167526696173.433354.17408372048319432574.stgit@mhiramat.roam.corp.google.com

Cc: Florent Revest <revest@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Stable-dep-of: 700b2b4397 ("fprobe: Fix to ensure the number of active retprobes is not zero")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Masami Hiramatsu (Google)
2023-02-02 00:56:01 +09:00
committed by Greg Kroah-Hartman
parent bacf8c749a
commit 0806cb1e6c
5 changed files with 29 additions and 14 deletions
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6
lib/test_fprobe.c
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@@ -30,7 +30,8 @@ static noinline u32 fprobe_selftest_target2(u32 value)
return (value / div_factor) + 1;
}
static notrace void fp_entry_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs)
static notrace void fp_entry_handler(struct fprobe *fp, unsigned long ip,
struct pt_regs *regs, void *data)
{
KUNIT_EXPECT_FALSE(current_test, preemptible());
/* This can be called on the fprobe_selftest_target and the fprobe_selftest_target2 */
@@ -39,7 +40,8 @@ static notrace void fp_entry_handler(struct fprobe *fp, unsigned long ip, struct
entry_val = (rand1 / div_factor);
}
static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs)
static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip,
struct pt_regs *regs, void *data)
{
unsigned long ret = regs_return_value(regs);