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ELF/BFD: Fix padding in `elf_external_linux_prpsinfo64'

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Fix commit 70a38d42c5 ("New entry points for writing Linux NT_PRPSINFO
notes."), <https://sourceware.org/ml/binutils/2013-02/msg00023.html>,
and move the padding of the `elf_external_linux_prpsinfo64' structure to
match the corresponding 64-bit Linux kernel `elf_prpsinfo' structure.

The 64-bit kernel structure is defined as follows:

(gdb) ptype struct elf_prpsinfo
type = struct elf_prpsinfo {
    char pr_state;
    char pr_sname;
    char pr_zomb;
    char pr_nice;
    unsigned long pr_flag;
    __kernel_uid_t pr_uid;
    __kernel_gid_t pr_gid;
    pid_t pr_pid;
    pid_t pr_ppid;
    pid_t pr_pgrp;
    pid_t pr_sid;
    char pr_fname[16];
    char pr_psargs[80];
}
(gdb) print /x &((struct elf_prpsinfo *)0)->pr_nice
$1 = 0x3
(gdb) print /x &((struct elf_prpsinfo *)0)->pr_flag
$2 = 0x8
(gdb) print /x &((struct elf_prpsinfo *)0)->pr_uid
$3 = 0x10
(gdb) print sizeof(((struct elf_prpsinfo *)0)->pr_flag)
$4 = 8
(gdb)

with implicit padding present before the `pr_flag' member, to correctly
align it to a multiple of 8.  Conversely `elf_external_linux_prpsinfo64'
has padding after its `pr_flag' member:

(top-gdb) ptype struct elf_external_linux_prpsinfo64
type = struct elf_external_linux_prpsinfo64 {
    char pr_state;
    char pr_sname;
    char pr_zomb;
    char pr_nice;
    char pr_flag[8];
    char gap[4];
    char pr_uid[4];
    char pr_gid[4];
    char pr_pid[4];
    char pr_ppid[4];
    char pr_pgrp[4];
    char pr_sid[4];
    char pr_fname[16];
    char pr_psargs[80];
}
(top-gdb) print /x &((struct elf_external_linux_prpsinfo64 *)0)->pr_nice
$1 = 0x3
(top-gdb) print /x &((struct elf_external_linux_prpsinfo64 *)0)->pr_flag
$2 = 0x4
(top-gdb) print /x &((struct elf_external_linux_prpsinfo64 *)0)->pr_uid
$3 = 0x10
(top-gdb)

and consequently `pr_flag' is misplaced.  Move `gap' ahead of `pr_flag'
then.

	bfd/
	* elf-linux-core.h (elf_external_linux_prpsinfo64): Move the
	`gap' member ahead of `pr_flag'.
This commit is contained in:
Maciej W. Rozycki 2017-10-11 15:01:40 +01:00
parent 458ca1d02e
commit 72bc1bb934
2 changed files with 6 additions and 1 deletions
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5
bfd/ChangeLog
View File

@ -1,3 +1,8 @@
2017-10-11 Maciej W. Rozycki <macro@imgtec.com>
* elf-linux-core.h (elf_external_linux_prpsinfo64): Move the
`gap' member ahead of `pr_flag'.
2017-10-11 Pedro Alves <palves@redhat.com>
* bfd.c (_doprnt): Rename to ...

2
bfd/elf-linux-core.h
View File

@ -85,8 +85,8 @@ struct elf_external_linux_prpsinfo64
char pr_sname; /* Char for pr_state. */
char pr_zomb; /* Zombie. */
char pr_nice; /* Nice val. */
char pr_flag[8]; /* Flags. */
char gap[4];
char pr_flag[8]; /* Flags. */
char pr_uid[4];
char pr_gid[4];
char pr_pid[4];