Author: kevans
Date: Wed Feb 19 14:32:55 2020
New Revision: 358109
URL: https://svnweb.freebsd.org/changeset/base/358109
Log:
kdump: decode SHM_ANON as first arg to legacy shm_open(2)
The first argument to shm_open(2) as well as shm_open2(2) may be a path or
SHM_ANON. Decode SHM_ANON, at least- paths will show up as namei results in
kdump output, which may be sufficient; in those cases, we'll have printed an
address.
Future commits will add support for shm_open2() to libsysdecode/truss/kdump.
Reported by: kaktus
MFC after: 3 days
Modified:
head/usr.bin/kdump/kdump.c
Modified: head/usr.bin/kdump/kdump.c
==============================================================================
--- head/usr.bin/kdump/kdump.c Wed Feb 19 14:29:47 2020 (r358108)
+++ head/usr.bin/kdump/kdump.c Wed Feb 19 14:32:55 2020 (r358109)
@@ -55,6 +55,7 @@ __FBSDID("$FreeBSD$");
#include <sys/uio.h>
#include <sys/event.h>
#include <sys/ktrace.h>
+#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
@@ -1248,7 +1249,12 @@ ktrsyscall(struct ktr_syscall *ktr, u_int sv_flags)
break;
#ifdef SYS_freebsd12_shm_open
case SYS_freebsd12_shm_open:
- print_number(ip, narg, c);
+ if (ip[0] == (uintptr_t)SHM_ANON) {
+ printf("(SHM_ANON");
+ ip++;
+ } else {
+ print_number(ip, narg, c);
+ }
putchar(',');
print_mask_arg(sysdecode_open_flags, ip[0]);
putchar(',');
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