| Message ID | 20240206161651.work.876-kees@kernel.org (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | 4bea747f3fbec33c16d369b2f51e55981d7c78d0 |
| Headers | show |
| Series | net/sun3_82586: Avoid reading past buffer in debug output | expand |
On Tue, Feb 06, 2024 at 08:16:54AM -0800, Kees Cook wrote: > Since NUM_XMIT_BUFFS is always 1, building m68k with sun3_defconfig and > -Warraybounds, this build warning is visible[1]: > > drivers/net/ethernet/i825xx/sun3_82586.c: In function 'sun3_82586_timeout': > drivers/net/ethernet/i825xx/sun3_82586.c:990:122: warning: array subscript 1 is above array bounds of 'volatile struct transmit_cmd_struct *[1]' [-Warray-bounds=] > 990 | printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status)); > | ~~~~~~~~~~~~^~~ > ... > drivers/net/ethernet/i825xx/sun3_82586.c:156:46: note: while referencing 'xmit_cmds' > 156 | volatile struct transmit_cmd_struct *xmit_cmds[NUM_XMIT_BUFFS]; > > Avoid accessing index 1 since it doesn't exist. > > Link: https://github.com/KSPP/linux/issues/325 [1] > Cc: Sam Creasey <sammy@sammy.net> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Eric Dumazet <edumazet@google.com> > Cc: Jakub Kicinski <kuba@kernel.org> > Cc: Paolo Abeni <pabeni@redhat.com> > Cc: Gustavo A. R. Silva <gustavoars@kernel.org> > Cc: netdev@vger.kernel.org > Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Simon Horman <horms@kernel.org> Tested-by: Simon Horman <horms@kernel.org> # build-tested ...
On 2/6/24 10:16, Kees Cook wrote: > Since NUM_XMIT_BUFFS is always 1, building m68k with sun3_defconfig and > -Warraybounds, this build warning is visible[1]: > > drivers/net/ethernet/i825xx/sun3_82586.c: In function 'sun3_82586_timeout': > drivers/net/ethernet/i825xx/sun3_82586.c:990:122: warning: array subscript 1 is above array bounds of 'volatile struct transmit_cmd_struct *[1]' [-Warray-bounds=] > 990 | printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status)); > | ~~~~~~~~~~~~^~~ > ... > drivers/net/ethernet/i825xx/sun3_82586.c:156:46: note: while referencing 'xmit_cmds' > 156 | volatile struct transmit_cmd_struct *xmit_cmds[NUM_XMIT_BUFFS]; > > Avoid accessing index 1 since it doesn't exist. > > Link: https://github.com/KSPP/linux/issues/325 [1] > Cc: Sam Creasey <sammy@sammy.net> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Eric Dumazet <edumazet@google.com> > Cc: Jakub Kicinski <kuba@kernel.org> > Cc: Paolo Abeni <pabeni@redhat.com> > Cc: Gustavo A. R. Silva <gustavoars@kernel.org> > Cc: netdev@vger.kernel.org > Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Thanks!
Hello: This patch was applied to netdev/net-next.git (main) by Jakub Kicinski <kuba@kernel.org>: On Tue, 6 Feb 2024 08:16:54 -0800 you wrote: > Since NUM_XMIT_BUFFS is always 1, building m68k with sun3_defconfig and > -Warraybounds, this build warning is visible[1]: > > drivers/net/ethernet/i825xx/sun3_82586.c: In function 'sun3_82586_timeout': > drivers/net/ethernet/i825xx/sun3_82586.c:990:122: warning: array subscript 1 is above array bounds of 'volatile struct transmit_cmd_struct *[1]' [-Warray-bounds=] > 990 | printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status)); > | ~~~~~~~~~~~~^~~ > ... > drivers/net/ethernet/i825xx/sun3_82586.c:156:46: note: while referencing 'xmit_cmds' > 156 | volatile struct transmit_cmd_struct *xmit_cmds[NUM_XMIT_BUFFS]; > > [...] Here is the summary with links: - net/sun3_82586: Avoid reading past buffer in debug output https://git.kernel.org/netdev/net-next/c/4bea747f3fbe You are awesome, thank you!
diff --git a/drivers/net/ethernet/i825xx/sun3_82586.c b/drivers/net/ethernet/i825xx/sun3_82586.c index 5e27470c6b1e..f2d4669c81cf 100644 --- a/drivers/net/ethernet/i825xx/sun3_82586.c +++ b/drivers/net/ethernet/i825xx/sun3_82586.c @@ -987,7 +987,7 @@ static void sun3_82586_timeout(struct net_device *dev, unsigned int txqueue) { #ifdef DEBUG printk("%s: xmitter timed out, try to restart! stat: %02x\n",dev->name,p->scb->cus); - printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status)); + printk("%s: command-stats: %04x\n", dev->name, swab16(p->xmit_cmds[0]->cmd_status)); printk("%s: check, whether you set the right interrupt number!\n",dev->name); #endif sun3_82586_close(dev);
Since NUM_XMIT_BUFFS is always 1, building m68k with sun3_defconfig and -Warraybounds, this build warning is visible[1]: drivers/net/ethernet/i825xx/sun3_82586.c: In function 'sun3_82586_timeout': drivers/net/ethernet/i825xx/sun3_82586.c:990:122: warning: array subscript 1 is above array bounds of 'volatile struct transmit_cmd_struct *[1]' [-Warray-bounds=] 990 | printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status)); | ~~~~~~~~~~~~^~~ ... drivers/net/ethernet/i825xx/sun3_82586.c:156:46: note: while referencing 'xmit_cmds' 156 | volatile struct transmit_cmd_struct *xmit_cmds[NUM_XMIT_BUFFS]; Avoid accessing index 1 since it doesn't exist. Link: https://github.com/KSPP/linux/issues/325 [1] Cc: Sam Creasey <sammy@sammy.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Cc: Gustavo A. R. Silva <gustavoars@kernel.org> Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> --- drivers/net/ethernet/i825xx/sun3_82586.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)