* driver/video/fbdev/aty/atyfb_base.c: atyfb_ioctl() stack infoleak
@ 2017-08-03 14:01 sohu0106
0 siblings, 0 replies; only message in thread
From: sohu0106 @ 2017-08-03 14:01 UTC (permalink / raw)
To: linux-fbdev; +Cc: linux-kernel, torvalds
driver/video/fbdev/aty/atyfb_base.c
In atyfb_ioctl() structure atyclk is copied to userland with padding bytes after "vclk_post_div" field unitialized. It leads to leaking of contents of kernel stack memory.
3 drivers/video/fbdev/aty/atyfb_base.c
@@ -1857,6 +1857,9 @@ static int atyfb_ioctl(struct fb_info *info, u_int cmd, u_long arg)
if (M64_HAS(INTEGRATED)) {
struct atyclk clk;
union aty_pll *pll = &par->pll;
+
+ memset( &clk, 0, sizeof(struct atyclk) );
+
u32 dsp_config = pll->ct.dsp_config;
u32 dsp_on_off = pll->ct.dsp_on_off;
clk.ref_clk_per = par->ref_clk_per;
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2017-08-03 14:01 driver/video/fbdev/aty/atyfb_base.c: atyfb_ioctl() stack infoleak sohu0106
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