diff mbox series

[bpf,1/2] x86/bpf: Fix IP after emitting call depth accounting

Message ID 20240329092723.17435-2-ubizjak@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series x86/bpf: Fixes for the BPF JIT with retbleed=stuff | expand

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netdev/series_format success Posting correctly formatted
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netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers fail 2 blamed authors not CCed: peterz@infradead.org tglx@linutronix.de; 18 maintainers not CCed: john.fastabend@gmail.com andrii@kernel.org kpsingh@kernel.org mingo@redhat.com martin.lau@linux.dev tglx@linutronix.de dsahern@kernel.org eddyz87@gmail.com sdf@google.com bp@alien8.de netdev@vger.kernel.org yonghong.song@linux.dev dave.hansen@linux.intel.com peterz@infradead.org hpa@zytor.com haoluo@google.com jolsa@kernel.org song@kernel.org
netdev/build_clang success Errors and warnings before: 955 this patch: 955
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 956 this patch: 956
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netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Uros Bizjak March 29, 2024, 9:25 a.m. UTC 
From: Joan Bruguera Micó <joanbrugueram@gmail.com>

From: Joan Bruguera Micó <joanbrugueram@gmail.com>

Adjust the IP passed to `emit_patch` so it calculates the correct offset
for the CALL instruction if `x86_call_depth_emit_accounting` emits code.
Otherwise we will skip some instructions and most likely crash.

Fixes: b2e9dfe54be4 ("x86/bpf: Emit call depth accounting if required")
Link: https://lore.kernel.org/lkml/20230105214922.250473-1-joanbrugueram@gmail.com/
Signed-off-by: Joan Bruguera Micó <joanbrugueram@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
---
 arch/x86/net/bpf_jit_comp.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index a7ba8e178645..09f7dc9d4d65 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -479,9 +479,10 @@  static int emit_call(u8 **pprog, void *func, void *ip)
 
 static int emit_rsb_call(u8 **pprog, void *func, void *ip)
 {
+	void *adjusted_ip;
 	OPTIMIZER_HIDE_VAR(func);
-	x86_call_depth_emit_accounting(pprog, func);
-	return emit_patch(pprog, func, ip, 0xE8);
+	adjusted_ip = ip + x86_call_depth_emit_accounting(pprog, func);
+	return emit_patch(pprog, func, adjusted_ip, 0xE8);
 }
 
 static int emit_jump(u8 **pprog, void *func, void *ip)