On Wed, Jul 15, 2020 at 5:22 PM Jessica Clarke wrote:
>
> [H.J. Lu Cc'ed as author of what looks like the problematic commit]
>
> On Wed, 15 Jul 2020 23:47:27 +0200 (CEST) Thorsten Glaser
> wrote:
> > Some more analysis:
> >
> > We enter libc from openssh code with the correct values in rsi and
[H.J. Lu Cc'ed as author of what looks like the problematic commit]
On Wed, 15 Jul 2020 23:47:27 +0200 (CEST) Thorsten Glaser
wrote:
> Some more analysis:
>
> We enter libc from openssh code with the correct values in rsi and rdi:
>
>
> (gdb) u
> => 0x56560e45 : call 0x5655d0b0
> (gdb)
Processing commands for cont...@bugs.debian.org:
> affects 965091 openssh-server
Bug #965091 [libc6] glibc: setgroups: Bad address [2.31/x32, regression from
2.30]
Added indication that 965091 affects openssh-server
> affects 965091 postfix
Bug #965091 [libc6] glibc: setgroups: Bad address [2.31/
> So something clearly changed…
Compiler output, most probably. I cannot reproduce it. I tried:
struct xid_command
{
int syscall_no;
long int id[3];
volatile int cntr;
volatile int error; /* -1: no call yet, 0: success seen, >0: error
seen.
Some more analysis:
We enter libc from openssh code with the correct values in rsi and rdi:
(gdb) u
=> 0x56560e45 : call 0x5655d0b0
(gdb) info r
rax0xfffe 65534
rbx0x5663a000 1449369600
rcx0x0 0
rdx0x0
Package: libc6
Version: 2.31-1
Severity: grave
Justification: renders package unusable
This is related to #965086 and #965087 (and, in fact, possibly
causing them). After a glibc upgrade half the system services
(postfix, sshd, apt-get(!)) don’t work any more.
Downgrading with dpkg -i the followi
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