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CVE PROGRAM SOURCE RECORDUnscored

CVE-2023-53694

riscv: ftrace: Fixup panic by disabling preemption

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: riscv: ftrace: Fixup panic by disabling preemption In RISCV, we must use an AUIPC + JALR pair to encode an immediate, forming a jump that jumps to an address over 4K. This may cause errors if we want to enable kernel preemption and remove dependency from patching code with stop_machine(). For example, if a task was switched out on auipc. And, if we changed the ftrace function before it was switched back, then it would jump to an address that has updated 11:0 bits mixing with previous XLEN:12 part. p: patched area performed by dynamic ftrace ftrace_prologue: p| REG_S ra, -SZREG(sp) p| auipc ra, 0x? ------------> preempted ... change ftrace function ... p| jalr -?(ra) <------------- switched back p| REG_L ra, -SZREG(sp) func: xxx ret

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • afc76b8b80112189b6f11e67e19cf58301944814 to < 84cfcf240f4a577733b1d98fcd2611a611612b03affected
  • afc76b8b80112189b6f11e67e19cf58301944814 to < 20a7510e781084364691b4962de31de758194cc9affected
  • afc76b8b80112189b6f11e67e19cf58301944814 to < 8547649981e6631328cd64f583667501ae385531affected

Linux Linux

Default version status: affected

  • 5.12affected
  • 0 to < 5.12unaffected
  • 6.1.23 to ≤ 6.1.*unaffected
  • 6.2.3 to ≤ 6.2.*unaffected
  • 6.3 to ≤ *unaffected

References