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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2022-02-14 16:11:35 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2022-03-08 00:04:57 +1100
commitacd7408d2748533d767387cb4308692fba543658 (patch)
tree422fa950fadef5df113aa6872f96e2d15cf2a361 /arch/powerpc/net
parent591b4b268435f00d2f0b81f786c2c7bd5ef66416 (diff)
downloadlinux-acd7408d2748533d767387cb4308692fba543658.tar.bz2
powerpc/bpf: Skip branch range validation during first pass
During the first pass, addrs[] is still being populated. So, all branches to following instructions will appear to be going to the start of the JIT program. Ignore branch range validation for such instructions and assume those to be in range. Branch range validation will happen during the second pass after addrs[] is setup properly. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/bc517413d11636e20dbfc88503dad14bcbe391e2.1644834730.git.naveen.n.rao@linux.vnet.ibm.com
Diffstat (limited to 'arch/powerpc/net')
-rw-r--r--arch/powerpc/net/bpf_jit.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index b75507fc8f6b..25a7190bcee9 100644
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h
@@ -27,7 +27,7 @@
#define PPC_JMP(dest) \
do { \
long offset = (long)(dest) - (ctx->idx * 4); \
- if (!is_offset_in_branch_range(offset)) { \
+ if ((dest) != 0 && !is_offset_in_branch_range(offset)) { \
pr_err_ratelimited("Branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx); \
return -ERANGE; \
} \
@@ -41,7 +41,7 @@
#define PPC_BCC_SHORT(cond, dest) \
do { \
long offset = (long)(dest) - (ctx->idx * 4); \
- if (!is_offset_in_cond_branch_range(offset)) { \
+ if ((dest) != 0 && !is_offset_in_cond_branch_range(offset)) { \
pr_err_ratelimited("Conditional branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx); \
return -ERANGE; \
} \