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| author | Gustavo A. R. Silva <[email protected]> | 2018-12-18 11:52:16 -0600 |
|---|---|---|
| committer | Takashi Iwai <[email protected]> | 2018-12-19 14:34:02 +0100 |
| commit | 5ae4f61f012a097df93de2285070ec8e34716d29 (patch) | |
| tree | 7e52e848a4414c037abc6ecdae46ca6ecd40a9e8 /scripts/bpf_helpers_doc.py | |
| parent | 0b84304ef5da92add8dc75a1b07879c5374cdb05 (diff) | |
ALSA: emu10k1: Fix potential Spectre v1 vulnerabilities
ipcm->substream is indirectly controlled by user-space, hence leading to
a potential exploitation of the Spectre variant 1 vulnerability.
This issue was detected with the help of Smatch:
sound/pci/emu10k1/emufx.c:1031 snd_emu10k1_ipcm_poke() warn: potential spectre issue 'emu->fx8010.pcm' [r] (local cap)
sound/pci/emu10k1/emufx.c:1075 snd_emu10k1_ipcm_peek() warn: potential spectre issue 'emu->fx8010.pcm' [r] (local cap)
Fix this by sanitizing ipcm->substream before using it to index emu->fx8010.pcm
Notice that given that speculation windows are large, the policy is
to kill the speculation on the first load and not worry if it can be
completed with a dependent load/store [1].
[1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2
Cc: [email protected]
Signed-off-by: Gustavo A. R. Silva <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Diffstat (limited to 'scripts/bpf_helpers_doc.py')
0 files changed, 0 insertions, 0 deletions