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Intel ID: PSIRT-TA-201910-001

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CVEID: CVE-2019-14615
 
 Summary of Vulnerability
 ------------------------
 Insufficient control flow in certain data structures for some Intel(R)
 Processors with Intel Processor Graphics may allow an unauthenticated
 user to potentially enable information disclosure via local access
 
 Products affected:
 ------------------
 Intel CPU’s with Gen7, Gen7.5 and Gen9 Graphics.
 
 Public Disclosure Schedule:
 ---------------------------
 Intel is pursuing a coordinated disclosure of this vulnerability.
 
 The targeted public disclosure date is January 14 2020
 
 Mitigation Summary
 ------------------
 This patch provides mitigation for Gen9 hardware only.
 Patches for Gen7 and Gen7.5 will be provided later.
 Note that Gen8 is not impacted due to a previously implemented
 workaround.
 
 The mitigation involves using an existing hardware feature to forcibly
 clear down all EU state at each context switch.
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Merge tag 'Intel-CVE-2019-14615' from bundle by Akeem Abodunrin.

Merge Intel Gen9 graphics fix from Akeem Abodunrin:
 "Insufficient control flow in certain data structures for some Intel
  Processors with Intel Processor Graphics may allow an unauthenticated
  user to potentially enable information disclosure via local access

  This provides mitigation for Gen9 hardware. Note that Gen8 is not
  impacted due to a previously implemented workaround.

  The mitigation involves using an existing hardware feature to forcibly
  clear down all EU state at each context switch"

* tag 'Intel-CVE-2019-14615' of emailed bundle from Akeem G Abodunrin <akeem.g.abodunrin@intel.com>:
  drm/i915/gen9: Clear residual context state on context switch
This commit is contained in:
Linus Torvalds 2020-01-13 18:40:57 -08:00
commit 63d264fe08
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/gt/intel_lrc.c
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@ -2664,6 +2664,14 @@ static u32 *gen9_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch)
/* WaFlushCoherentL3CacheLinesAtContextSwitch:skl,bxt,glk */
batch = gen8_emit_flush_coherentl3_wa(engine, batch);
/* WaClearSlmSpaceAtContextSwitch:skl,bxt,kbl,glk,cfl */
batch = gen8_emit_pipe_control(batch,
PIPE_CONTROL_FLUSH_L3 |
PIPE_CONTROL_STORE_DATA_INDEX |
PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_QW_WRITE,
LRC_PPHWSP_SCRATCH_ADDR);
batch = emit_lri(batch, lri, ARRAY_SIZE(lri));
/* WaMediaPoolStateCmdInWABB:bxt,glk */