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6ac05e832a
Architectures that support address tagging, such as arm64, may want to expose fault address tag bits to the signal handler to help diagnose memory errors. However, these bits have not been previously set, and their presence may confuse unaware user applications. Therefore, introduce a SA_EXPOSE_TAGBITS flag bit in sa_flags that a signal handler may use to explicitly request that the bits are set. The generic signal handler APIs expect to receive tagged addresses. Architectures may specify how to untag addresses in the case where SA_EXPOSE_TAGBITS is clear by defining the arch_untagged_si_addr function. Signed-off-by: Peter Collingbourne <pcc@google.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Link: https://linux-review.googlesource.com/id/I16dd0ed2081f091fce97be0190cb8caa874c26cb Link: https://lkml.kernel.org/r/13cf24d00ebdd8e1f55caf1821c7c29d54100191.1605904350.git.pcc@google.com Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
83 lines
1.6 KiB
C
83 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SIGNAL_TYPES_H
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#define _LINUX_SIGNAL_TYPES_H
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/*
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* Basic signal handling related data type definitions:
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*/
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#include <linux/list.h>
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#include <uapi/linux/signal.h>
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typedef struct kernel_siginfo {
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__SIGINFO;
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} kernel_siginfo_t;
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/*
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* Real Time signals may be queued.
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*/
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struct sigqueue {
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struct list_head list;
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int flags;
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kernel_siginfo_t info;
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struct user_struct *user;
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};
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/* flags values. */
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#define SIGQUEUE_PREALLOC 1
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struct sigpending {
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struct list_head list;
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sigset_t signal;
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};
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struct sigaction {
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#ifndef __ARCH_HAS_IRIX_SIGACTION
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__sighandler_t sa_handler;
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unsigned long sa_flags;
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#else
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unsigned int sa_flags;
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__sighandler_t sa_handler;
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#endif
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#ifdef __ARCH_HAS_SA_RESTORER
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__sigrestore_t sa_restorer;
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#endif
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sigset_t sa_mask; /* mask last for extensibility */
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};
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struct k_sigaction {
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struct sigaction sa;
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#ifdef __ARCH_HAS_KA_RESTORER
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__sigrestore_t ka_restorer;
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#endif
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};
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#ifdef CONFIG_OLD_SIGACTION
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struct old_sigaction {
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__sighandler_t sa_handler;
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old_sigset_t sa_mask;
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unsigned long sa_flags;
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__sigrestore_t sa_restorer;
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};
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#endif
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struct ksignal {
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struct k_sigaction ka;
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kernel_siginfo_t info;
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int sig;
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};
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#ifndef __ARCH_UAPI_SA_FLAGS
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#ifdef SA_RESTORER
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#define __ARCH_UAPI_SA_FLAGS SA_RESTORER
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#else
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#define __ARCH_UAPI_SA_FLAGS 0
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#endif
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#endif
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#define UAPI_SA_FLAGS \
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(SA_NOCLDSTOP | SA_NOCLDWAIT | SA_SIGINFO | SA_ONSTACK | SA_RESTART | \
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SA_NODEFER | SA_RESETHAND | SA_EXPOSE_TAGBITS | __ARCH_UAPI_SA_FLAGS)
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#endif /* _LINUX_SIGNAL_TYPES_H */
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