diff mbox series

[bpf-next,v2,03/20] bpf: Factor out get_map_btf() helper

Message ID 20250125111109.732718-4-houtao@huaweicloud.com (mailing list archive)
State New
Delegated to: BPF
Headers show
Series Support dynptr key for hash map | expand

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bpf/vmtest-bpf-next-PR fail PR summary
bpf/vmtest-bpf-next-VM_Test-7 success Logs for aarch64-gcc / test (test_progs, false, 360) / test_progs on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-8 success Logs for aarch64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on aarch64 with gcc
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netdev/series_format fail Series longer than 15 patches
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit fail Errors and warnings before: 0 this patch: 1
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 13 of 13 maintainers
netdev/build_clang fail Errors and warnings before: 4 this patch: 5
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netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 21 lines checked
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netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Hou Tao Jan. 25, 2025, 11:10 a.m. UTC 
From: Hou Tao <houtao1@huawei.com>

get_map_btf() gets the btf from the btf fd and ensure the btf is not a
kernel btf.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 kernel/bpf/syscall.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
diff mbox series

Patch

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 6e14208cca813..ba2df15ae0f1f 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1345,6 +1345,21 @@  static bool bpf_net_capable(void)
 	return capable(CAP_NET_ADMIN) || capable(CAP_SYS_ADMIN);
 }
 
+static struct btf *get_map_btf(int btf_fd)
+{
+	struct btf *btf = btf_get_by_fd(btf_fd);
+
+	if (IS_ERR(btf))
+		return btf;
+
+	if (btf_is_kernel(btf)) {
+		btf_put(btf);
+		return ERR_PTR(-EACCES);
+	}
+
+	return btf;
+}
+
 #define BPF_MAP_CREATE_LAST_FIELD map_token_fd
 /* called via syscall */
 static int map_create(union bpf_attr *attr)