Thread (11 messages) 11 messages, 1 author, 2021-09-14

[PATCH bpf-next v2 06/10] bpf: Bump MAX_BPF_STACK size to 768 bytes

STALE1847d

From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Date: 2021-09-14 12:38:17
Also in: bpf
Subsystem: bpf [core], bpf [general] (safe dynamic programs and tools), the rest · Maintainers: Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds

Revision v2 of 7 in this series.

Revisions (7)
  1. v1 [diff vs current]
  2. v2 current
  3. v3 [diff vs current]
  4. v4 [diff vs current]
  5. v5 [diff vs current]
  6. v6 [diff vs current]
  7. v7 [diff vs current]
Increase the maximum stack size accessible to BPF program to 768 bytes.
This is done so that gen_loader can use 94 additional fds for kfunc BTFs
that it passes in to fd_array from the remaining space available for the
loader_stack struct to expand.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 include/linux/filter.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 4a93c12543ee..b214189ece62 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -82,8 +82,8 @@ struct ctl_table_header;
  */
 #define BPF_SYM_ELF_TYPE	't'
 
-/* BPF program can access up to 512 bytes of stack space. */
-#define MAX_BPF_STACK	512
+/* BPF program can access up to 768 bytes of stack space. */
+#define MAX_BPF_STACK	768
 
 /* Helper macros for filter block array initializers. */
 
-- 
2.33.0
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