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[4/7] tools headers UAPI: Update tools's copy of bpf.h header

Message ID 20250125-bpf_dynptr_probe-v1-4-c3cb121f6951@outlook.com
State New
Headers show
Series bpf: Add probe_read_{kernel,user}_dynptr and copy_from_user_dynptr | expand

Commit Message

Levi Zim via B4 Relay Jan. 25, 2025, 8:23 a.m. UTC 
From: Levi Zim <rsworktech@outlook.com>

This update brings the new bpf_probe_read_{kernel,user} helpers

Signed-off-by: Levi Zim <rsworktech@outlook.com>
---
 tools/include/uapi/linux/bpf.h | 49 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
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Patch

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 2acf9b33637174bd16b1d12ccc6410c5f55a7ea9..f92cf809b50bc393d54eb0e8de2e1ce2a39e95d0 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -5805,6 +5805,52 @@  union bpf_attr {
  *		0 on success.
  *
  *		**-ENOENT** if the bpf_local_storage cannot be found.
+ *
+ * long bpf_probe_read_kernel_dynptr(const struct bpf_dynptr *dst, u32 offset, u32 size, const void *unsafe_ptr, u64 flags)
+ *	Description
+ *		Safely attempt to read *size* bytes from kernel space address
+ *		*unsafe_ptr* and store the data in *dst* starting from *offset*.
+ *		*flags* is currently unused.
+ *	Return
+ *		0 on success.
+ *
+ *		**-E2BIG** if *offset* + *len* exceeds the length of *src*'s data
+ *
+ *		**-EINVAL** if *src* is an invalid dynptr or doesn't support this
+ *		support this helper, or if *flags* is not 0.
+ *
+ *		Or other negative errors on failure reading kernel memory.
+ *
+ * long bpf_probe_read_user_dynptr(const struct bpf_dynptr *dst, u32 offset, u32 size, const void *unsafe_ptr, u64 flags)
+ *	Description
+ *		Safely attempt to read *size* bytes from user space address
+ *		*unsafe_ptr* and store the data in *dst* starting from *offset*.
+ *		*flags* is currently unused.
+ *	Return
+ *		0 on success.
+ *
+ *		**-E2BIG** if *offset* + *len* exceeds the length of *src*'s data
+ *
+ *		**-EINVAL** if *src* is an invalid dynptr or doesn't support this
+ *		support this helper, or if *flags* is not 0.
+ *
+ *		Or other negative errors on failure reading user space memory.
+ *
+ * long bpf_copy_from_user_dynptr(const struct bpf_dynptr *dst, u32 offset, u32 size, const void *user_ptr, u64 flags)
+ *	Description
+ *		Read *size* bytes from user space address *user_ptr* and store
+ *		the data in *dst* starting from *offset*.
+ *		This is a wrapper of **copy_from_user**\ ().
+ *		*flags* is currently unused.
+ *	Return
+ *		0 on success.
+ *
+ *		**-E2BIG** if *offset* + *len* exceeds the length of *src*'s data
+ *
+ *		**-EINVAL** if *src* is an invalid dynptr or doesn't support this
+ *		support this helper, or if *flags* is not 0.
+ *
+ *		Or other negative errors on failure reading user space memory.
  */
 #define ___BPF_FUNC_MAPPER(FN, ctx...)			\
 	FN(unspec, 0, ##ctx)				\
@@ -6019,6 +6065,9 @@  union bpf_attr {
 	FN(user_ringbuf_drain, 209, ##ctx)		\
 	FN(cgrp_storage_get, 210, ##ctx)		\
 	FN(cgrp_storage_delete, 211, ##ctx)		\
+	FN(probe_read_kernel_dynptr, 212, ##ctx)		\
+	FN(probe_read_user_dynptr, 213, ##ctx)		\
+	FN(copy_from_user_dynptr, 214, ##ctx)		\
 	/* */
 
 /* backwards-compatibility macros for users of __BPF_FUNC_MAPPER that don't