CVE-2024-43840: bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG
First published: Sat Aug 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG When BPF_TRAMP_F_CALL_ORIG is set, the trampoline calls __bpf_tramp_enter() and __bpf_tramp_exit() functions, passing them the struct bpf_tramp_image *im pointer as an argument in R0. The trampoline generation code uses emit_addr_mov_i64() to emit instructions for moving the bpf_tramp_image address into R0, but emit_addr_mov_i64() assumes the address to be in the vmalloc() space and uses only 48 bits. Because bpf_tramp_image is allocated using kzalloc(), its address can use more than 48-bits, in this case the trampoline will pass an invalid address to __bpf_tramp_enter/exit() causing a kernel crash. Fix this by using emit_a64_mov_i64() in place of emit_addr_mov_i64() as it can work with addresses that are greater than 48-bits.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=6.0<6.10.3 | |
| debian/linux | <=6.1.115-1<=6.1.119-1 | 5.10.223-1 5.10.226-1 6.11.10-1 6.12.5-1 |
| >=6.0<6.10.3 |
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Reference Links
- https://git.kernel.org/stable/c/19d3c179a37730caf600a97fed3794feac2b197b
- https://git.kernel.org/stable/c/6d218fcc707d6b2c3616b6cd24b948fd4825cfec
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-43840
- https://nvd.nist.gov/vuln/detail/CVE-2024-43840
- https://launchpad.net/bugs/cve/CVE-2024-43840
- https://security-tracker.debian.org/tracker/CVE-2024-43840
- https://ubuntu.com/security/CVE-2024-43840
- https://git.kernel.org/linus/19d3c179a37730caf600a97fed3794feac2b197b
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