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| author | Michal Hocko <mhocko@suse.com> | 2016-05-23 15:35:51 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-05-23 16:45:25 +0200 |
| commit | cf0d44d513f275be9ce42158079d4257e8973889 (patch) | |
| tree | e2a6d7b9108260e8ab0aa327a129422fb089862d /arch/s390/mm | |
| parent | e9bc15f28e5f0db44aba609780d6850eabefbf11 (diff) | |
| download | linux-cf0d44d513f275be9ce42158079d4257e8973889.tar.bz2 | |
s390: fix info leak in do_sigsegv
Aleksa has reported incorrect si_errno value when stracing task which
received SIGSEGV:
[pid 20799] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_errno=2510266, si_addr=0x100000000000000}
The reason seems to be that do_sigsegv is not initializing siginfo
structure defined on the stack completely so it will leak 4B of
the previous stack content. Fix it simply by initializing si_errno
to 0 (same as do_sigbus does already).
Cc: stable # introduced pre-git times
Reported-by: Aleksa Sarai <asarai@suse.de>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/fault.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 7a3144017301..19288c1b36d3 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -250,6 +250,7 @@ static noinline void do_sigsegv(struct pt_regs *regs, int si_code) report_user_fault(regs, SIGSEGV, 1); si.si_signo = SIGSEGV; + si.si_errno = 0; si.si_code = si_code; si.si_addr = (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK); force_sig_info(SIGSEGV, &si, current); |