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bpf: Add bpf_kallsyms_lookup_name helper

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This helper allows us to get the address of a kernel symbol from inside
a BPF_PROG_TYPE_SYSCALL prog (used by gen_loader), so that we can
relocate typeless ksym vars.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20211028063501.2239335-2-memxor@gmail.com
This commit is contained in:
Kumar Kartikeya Dwivedi 2021-10-28 12:04:54 +05:30 committed by Andrii Nakryiko
parent 28c8a2c179
commit 1dd20d7144
1 changed files with 16 additions and 0 deletions
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16
include/uapi/linux/bpf.h
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@ -4923,6 +4923,21 @@ union bpf_attr {
* Dynamically cast a *sk* pointer to a *unix_sock* pointer.
* Return
* *sk* if casting is valid, or **NULL** otherwise.
*
* long bpf_kallsyms_lookup_name(const char *name, int name_sz, int flags, u64 *res)
* Description
* Get the address of a kernel symbol, returned in *res*. *res* is
* set to 0 if the symbol is not found.
* Return
* On success, zero. On error, a negative value.
*
* **-EINVAL** if *flags* is not zero.
*
* **-EINVAL** if string *name* is not the same size as *name_sz*.
*
* **-ENOENT** if symbol is not found.
*
* **-EPERM** if caller does not have permission to obtain kernel address.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@ -5104,6 +5119,7 @@ union bpf_attr {
FN(get_branch_snapshot), \
FN(trace_vprintk), \
FN(skc_to_unix_sock), \
FN(kallsyms_lookup_name), \
/* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper