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author | 2018-01-22 14:37:25 -0600 | |
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committer | 2018-01-22 19:07:11 -0600 | |
commit | f71dd7dc2dc989dc712b246a74d243e4b2c5f8a7 (patch) | |
tree | c126cf571c0a25c540210fa7bfe8f03b19d0c2a4 /kernel/signal.c | |
parent | signal/powerpc: Remove unnecessary signal_code parameter of do_send_trap (diff) | |
download | linux-f71dd7dc2dc989dc712b246a74d243e4b2c5f8a7.tar.gz linux-f71dd7dc2dc989dc712b246a74d243e4b2c5f8a7.tar.bz2 linux-f71dd7dc2dc989dc712b246a74d243e4b2c5f8a7.zip |
signal/ptrace: Add force_sig_ptrace_errno_trap and use it where needed
There are so many places that build struct siginfo by hand that at
least one of them is bound to get it wrong. A handful of cases in the
kernel arguably did just that when using the errno field of siginfo to
pass no errno values to userspace. The usage is limited to a single
si_code so at least does not mess up anything else.
Encapsulate this questionable pattern in a helper function so
that the userspace ABI is preserved.
Update all of the places that use this pattern to use the new helper
function.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r-- | kernel/signal.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 4f6300ef8062..e549174c0831 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1599,6 +1599,21 @@ int force_sig_pkuerr(void __user *addr, u32 pkey) } #endif +/* For the crazy architectures that include trap information in + * the errno field, instead of an actual errno value. + */ +int force_sig_ptrace_errno_trap(int errno, void __user *addr) +{ + struct siginfo info; + + clear_siginfo(&info); + info.si_signo = SIGTRAP; + info.si_errno = errno; + info.si_code = TRAP_HWBKPT; + info.si_addr = addr; + return force_sig_info(info.si_signo, &info, current); +} + int kill_pgrp(struct pid *pid, int sig, int priv) { int ret; |