diff mbox series

[bpf,v6,3/3] selftests/bpf: Test PROBE_MEM of VSYSCALL_ADDR on x86-64

Message ID 20240424100210.11982-4-puranjay@kernel.org (mailing list archive)
State Accepted
Commit 7cd6750d9a560fa69bb640a7280479d6a67999ad
Delegated to: BPF
Headers show
Series bpf: prevent userspace memory access | 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 Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 7 maintainers not CCed: linux-stm32@st-md-mailman.stormreply.com alexandre.torgue@foss.st.com shuah@kernel.org linux-kselftest@vger.kernel.org linux-arm-kernel@lists.infradead.org mykolal@fb.com mcoquelin.stm32@gmail.com
netdev/build_clang success Errors and warnings before: 8 this patch: 8
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netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
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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

Puranjay Mohan April 24, 2024, 10:02 a.m. UTC 
The vsyscall is a legacy API for fast execution of system calls. It maps
a page at address VSYSCALL_ADDR into the userspace program. This address
is in the top 10MB of the address space:

ffffffffff600000 - ffffffffff600fff |    4 kB | legacy vsyscall ABI

The last commit fixes the x86-64 BPF JIT to skip accessing addresses in
this memory region. Add this address to bpf_testmod_return_ptr() so we
can make sure that it is fixed.

After this change and without the previous commit, subprogs_extable
selftest will crash the kernel.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
---
 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
index 39ad96a18123..edcd26106557 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
@@ -205,6 +205,9 @@  __weak noinline struct file *bpf_testmod_return_ptr(int arg)
 	case 5: return (void *)~(1ull << 30);	/* trigger extable */
 	case 6: return &f;			/* valid addr */
 	case 7: return (void *)((long)&f | 1);	/* kernel tricks */
+#ifdef CONFIG_X86_64
+	case 8: return (void *)VSYSCALL_ADDR;   /* vsyscall page address */
+#endif
 	default: return NULL;
 	}
 }