linux-kernel - [PATCH] sched-ext: Use correct annotation for strings in kfuncs

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Message-ID: <20241021201143.2010388-1-memxor@gmail.com>
Date: Mon, 21 Oct 2024 13:11:43 -0700
From: Kumar Kartikeya Dwivedi <memxor@...il.com>
To: Tejun Heo <tj@...nel.org>
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] sched-ext: Use correct annotation for strings in kfuncs

The sched-ext kfuncs with bstr suffix need to take a string, but that
requires annotating the parameters with __str suffix, as right now the
verifier will treat this parameter as a one-byte memory region.

Fixes: f0e1a0643a59 ("sched_ext: Implement BPF extensible scheduler class")
Fixes: 07814a9439a3 ("sched_ext: Print debug dump after an error exit")
Cc: Tejun Heo <tj@...nel.org>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
---
 kernel/sched/ext.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 3cd7c50a51c5..8b8e3c907340 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -6708,7 +6708,7 @@ __bpf_kfunc_start_defs();
  * Indicate that the BPF scheduler wants to exit gracefully, and initiate ops
  * disabling.
  */
-__bpf_kfunc void scx_bpf_exit_bstr(s64 exit_code, char *fmt,
+__bpf_kfunc void scx_bpf_exit_bstr(s64 exit_code, char *fmt__str,
 				   unsigned long long *data, u32 data__sz)
 {
 	unsigned long flags;
@@ -6729,7 +6729,7 @@ __bpf_kfunc void scx_bpf_exit_bstr(s64 exit_code, char *fmt,
  * Indicate that the BPF scheduler encountered a fatal error and initiate ops
  * disabling.
  */
-__bpf_kfunc void scx_bpf_error_bstr(char *fmt, unsigned long long *data,
+__bpf_kfunc void scx_bpf_error_bstr(char *fmt__str, unsigned long long *data,
 				    u32 data__sz)
 {
 	unsigned long flags;
@@ -6753,7 +6753,7 @@ __bpf_kfunc void scx_bpf_error_bstr(char *fmt, unsigned long long *data,
  * The extra dump may be multiple lines. A single line may be split over
  * multiple calls. The last line is automatically terminated.
  */
-__bpf_kfunc void scx_bpf_dump_bstr(char *fmt, unsigned long long *data,
+__bpf_kfunc void scx_bpf_dump_bstr(char *fmt__str, unsigned long long *data,
 				   u32 data__sz)
 {
 	struct scx_dump_data *dd = &scx_dump_data;
--
2.43.5