diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2017-02-24 13:55:26 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2017-02-24 13:55:26 +0000 |
| commit | 63f495beb4007de5444614125fd6fd178ca6e2b1 (patch) | |
| tree | 4fa239a295b3c99663523b60760f94c9dfd9f9bb | |
| parent | 5842b55fd403ac0a16443aad58a8cf6d4c10cf77 (diff) | |
| parent | 92f2b88cea48c6aeba8de568a45f2ed958f3c298 (diff) | |
Merge remote-tracking branch 'remotes/kraxel/tags/pull-cve-2017-2620-20170224-1' into staging
cirrus: add blit_is_unsafe call to cirrus_bitblt_cputovideo (CVE-2017-2620)
# gpg: Signature made Fri 24 Feb 2017 13:42:39 GMT
# gpg: using RSA key 0x4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg: aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
# Primary key fingerprint: A032 8CFF B93A 17A7 9901 FE7D 4CB6 D8EE D3E8 7138
* remotes/kraxel/tags/pull-cve-2017-2620-20170224-1:
cirrus: add blit_is_unsafe call to cirrus_bitblt_cputovideo (CVE-2017-2620)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | hw/display/cirrus_vga.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c index 1deb52070a..b9e7cb1df1 100644 --- a/hw/display/cirrus_vga.c +++ b/hw/display/cirrus_vga.c @@ -900,6 +900,10 @@ static int cirrus_bitblt_cputovideo(CirrusVGAState * s) { int w; + if (blit_is_unsafe(s, true)) { + return 0; + } + s->cirrus_blt_mode &= ~CIRRUS_BLTMODE_MEMSYSSRC; s->cirrus_srcptr = &s->cirrus_bltbuf[0]; s->cirrus_srcptr_end = &s->cirrus_bltbuf[0]; @@ -925,6 +929,10 @@ static int cirrus_bitblt_cputovideo(CirrusVGAState * s) } s->cirrus_srccounter = s->cirrus_blt_srcpitch * s->cirrus_blt_height; } + + /* the blit_is_unsafe call above should catch this */ + assert(s->cirrus_blt_srcpitch <= CIRRUS_BLTBUFSIZE); + s->cirrus_srcptr = s->cirrus_bltbuf; s->cirrus_srcptr_end = s->cirrus_bltbuf + s->cirrus_blt_srcpitch; cirrus_update_memory_access(s); |