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take fdpic-related parts of elf_prstatus out 

The only architecture where we might end up using both is arm,
and there we definitely don't want fdpic-related fields in
elf_prstatus - coredump layout of ELF binaries should not
depend upon having the kernel built with the support of ELF_FDPIC
ones.  Just move the fdpic-modified variant into binfmt_elf_fdpic.c
(and call it elf_prstatus_fdpic there)

[name stolen from nico]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-06-14 09:52:06 -04:00
parent 1e6b57d642
commit 16aead8101
3 changed files with 29 additions and 17 deletions
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32
fs/binfmt_elf_fdpic.c
View File

@ -1189,6 +1189,32 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
*/
#ifdef CONFIG_ELF_CORE
struct elf_prstatus_fdpic
{
struct elf_siginfo pr_info; /* Info associated with signal */
short pr_cursig; /* Current signal */
unsigned long pr_sigpend; /* Set of pending signals */
unsigned long pr_sighold; /* Set of held signals */
pid_t pr_pid;
pid_t pr_ppid;
pid_t pr_pgrp;
pid_t pr_sid;
struct __kernel_old_timeval pr_utime; /* User time */
struct __kernel_old_timeval pr_stime; /* System time */
struct __kernel_old_timeval pr_cutime; /* Cumulative user time */
struct __kernel_old_timeval pr_cstime; /* Cumulative system time */
elf_gregset_t pr_reg; /* GP registers */
/* When using FDPIC, the loadmap addresses need to be communicated
* to GDB in order for GDB to do the necessary relocations. The
* fields (below) used to communicate this information are placed
* immediately after ``pr_reg'', so that the loadmap addresses may
* be viewed as part of the register set if so desired.
*/
unsigned long pr_exec_fdpic_loadmap;
unsigned long pr_interp_fdpic_loadmap;
int pr_fpvalid; /* True if math co-processor being used. */
};
/*
* Decide whether a segment is worth dumping; default is yes to be
* sure (missing info is worse than too much; etc).
@ -1345,7 +1371,7 @@ static inline void fill_note(struct memelfnote *note, const char *name, int type
* fill up all the fields in prstatus from the given task struct, except
* registers which need to be filled up separately.
*/
static void fill_prstatus(struct elf_prstatus *prstatus,
static void fill_prstatus(struct elf_prstatus_fdpic *prstatus,
struct task_struct *p, long signr)
{
prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
@ -1428,7 +1454,7 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
struct elf_thread_status
{
struct list_head list;
struct elf_prstatus prstatus; /* NT_PRSTATUS */
struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */
elf_fpregset_t fpu; /* NT_PRFPREG */
struct task_struct *thread;
#ifdef ELF_CORE_COPY_XFPREGS
@ -1562,7 +1588,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
loff_t offset = 0, dataoff;
int numnote;
struct memelfnote *notes = NULL;
struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
struct elf_prstatus_fdpic *prstatus = NULL; /* NT_PRSTATUS */
struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
LIST_HEAD(thread_list);
struct list_head *t;

4
include/linux/elfcore-compat.h
View File

@ -32,10 +32,6 @@ struct compat_elf_prstatus
struct old_timeval32 pr_cutime;
struct old_timeval32 pr_cstime;
compat_elf_gregset_t pr_reg;
#ifdef CONFIG_BINFMT_ELF_FDPIC
compat_ulong_t pr_exec_fdpic_loadmap;
compat_ulong_t pr_interp_fdpic_loadmap;
#endif
compat_int_t pr_fpvalid;
};

10
include/linux/elfcore.h
View File

@ -44,16 +44,6 @@ struct elf_prstatus
struct __kernel_old_timeval pr_cutime; /* Cumulative user time */
struct __kernel_old_timeval pr_cstime; /* Cumulative system time */
elf_gregset_t pr_reg; /* GP registers */
#ifdef CONFIG_BINFMT_ELF_FDPIC
/* When using FDPIC, the loadmap addresses need to be communicated
* to GDB in order for GDB to do the necessary relocations. The
* fields (below) used to communicate this information are placed
* immediately after ``pr_reg'', so that the loadmap addresses may
* be viewed as part of the register set if so desired.
*/
unsigned long pr_exec_fdpic_loadmap;
unsigned long pr_interp_fdpic_loadmap;
#endif
int pr_fpvalid; /* True if math co-processor being used. */
};