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linux-user/strace: add fsmount series of syscalls

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Following the addition of fsmount(2) series of syscalls in the syscall
handler, strace support is added, with a dedicated function to print the
parameters of fsconfig(2), which contains parameters that can be
interpreted as multiple types.

Snippet of the strace dump when running `mount -t tmpfs tmpfs /media`:

18 fsopen(tmpfs,1) = 3
18 read(3,0x407fcf1c,8191) = -1 errno=61 (No data available)
18 fsconfig(3,FSCONFIG_SET_STRING,"source","tmpfs",0) = 0
18 read(3,0x407fce3c,8191) = -1 errno=61 (No data available)
18 fsconfig(3,FSCONFIG_CMD_CREATE,NULL,NULL,0) = 0
18 read(3,0x407fce3c,8191) = -1 errno=61 (No data available)
18 fsmount(3,1,0) = 4
18 read(3,0x407fce3c,8191) = -1 errno=61 (No data available)
18 statx(4,"",AT_EMPTY_PATH|AT_STATX_SYNC_AS_STAT,0x1000,0x407fee98) = 0
18 move_mount(4,,-100,/media,4) = 0
18 read(3,0x407fcfcc,8191) = -1 errno=61 (No data available)
18 close(3) = 0
18 close(4) = 0

v2: Fixed build on RHEL9 due to missing syscalls (Helge)

Signed-off-by: Xinhui Yang <cyan@cyano.uk>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Xinhui Yang
2026-05-29 14:53:21 +08:00
committed by Helge Deller
parent 767c32fe69
commit 6e0aa9f6c7
2 changed files with 120 additions and 0 deletions
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105
linux-user/strace.c
View File

@@ -4344,6 +4344,111 @@ print_statx(CPUArchState *cpu_env, const struct syscallname *name,
}
#endif
#if defined(TARGET_NR_fsconfig) && defined(NR_fsconfig)
static void
print_fsconfig_cmd_name(int cmd)
{
switch (cmd) {
case FSCONFIG_SET_FLAG:
qemu_log("%s%s", "FSCONFIG_SET_FLAG", get_comma(0));
break;
case FSCONFIG_SET_STRING:
qemu_log("%s%s", "FSCONFIG_SET_STRING", get_comma(0));
break;
case FSCONFIG_SET_BINARY:
qemu_log("%s%s", "FSCONFIG_SET_BINARY", get_comma(0));
break;
case FSCONFIG_SET_PATH:
qemu_log("%s%s", "FSCONFIG_SET_PATH", get_comma(0));
break;
case FSCONFIG_SET_PATH_EMPTY:
qemu_log("%s%s", "FSCONFIG_SET_PATH_EMPTY", get_comma(0));
break;
case FSCONFIG_SET_FD:
qemu_log("%s%s", "FSCONFIG_SET_FD", get_comma(0));
break;
case FSCONFIG_CMD_CREATE:
qemu_log("%s%s", "FSCONFIG_CMD_CREATE", get_comma(0));
break;
case FSCONFIG_CMD_RECONFIGURE:
qemu_log("%s%s", "FSCONFIG_CMD_RECONFIGURE", get_comma(0));
break;
#ifdef FSCONFIG_CMD_CREATE_EXCL
case FSCONFIG_CMD_CREATE_EXCL:
/* Only available since Linux 6.6. */
qemu_log("%s%s", "FSCONFIG_CMD_CREATE_EXCL", get_comma(0));
break;
#endif
default:
qemu_log("%s (%d)%s", "UNKNOWN_CMD", cmd, get_comma(0));
break;
}
}
static void
print_fsconfig(CPUArchState *cpu_env, const struct syscallname *name,
abi_long arg0, abi_long arg1, abi_long arg2,
abi_long arg3, abi_long arg4, abi_long arg5)
{
/*
* fsconfig(int fd, int cmd, char* key, void* value, int aux)
* Where:
* fd: file descriptor returned by fsopen().
* cmd: integer constant specifying a command.
* key: a string, can be NULL on certain commands.
* value: any data in a buffer, can be NULL, raw buffer or a string.
* aux: axillary values such as flags for FSCONFIG_SET_PATH.
*/
int cmd = (int) arg1;
print_syscall_prologue(name);
print_raw_param("%d", arg0, 0);
print_fsconfig_cmd_name(cmd);
/* Process arg2 (key). */
switch (cmd) {
case FSCONFIG_SET_FLAG:
case FSCONFIG_SET_STRING:
case FSCONFIG_SET_BINARY:
case FSCONFIG_SET_PATH:
case FSCONFIG_SET_PATH_EMPTY:
case FSCONFIG_SET_FD:
print_string(arg2, 0);
break;
default:
print_pointer(arg2, 0);
break;
}
/* Process arg3 (value). */
switch (cmd) {
case FSCONFIG_SET_STRING:
case FSCONFIG_SET_PATH:
case FSCONFIG_SET_PATH_EMPTY:
print_string(arg3, 0);
break;
default:
print_pointer(arg3, 0);
break;
}
/*
* Process arg4 (aux).
* On FSCONFIG_SET_PATH and FSCONFIG_SET_PATH_EMPTY, aux can
* be either 0 or AT_FDCWD.
* On FSCONFIG_SET_BINARY, aux is an integer to state the length
* of the buffer pointed by arg3.
* Otherwise, it must be 0.
*/
switch (cmd) {
case FSCONFIG_SET_PATH:
case FSCONFIG_SET_PATH_EMPTY:
print_at_dirfd(arg4, 1);
break;
default:
print_raw_param("%d", arg4, 1);
break;
}
print_syscall_epilogue(name);
}
#endif
#ifdef TARGET_NR_ioctl
static void
print_ioctl(CPUArchState *cpu_env, const struct syscallname *name,

15
linux-user/strace.list
View File

@@ -1722,3 +1722,18 @@
#ifdef TARGET_NR_rseq
{ TARGET_NR_rseq, "rseq" , "%s(%p,%u,%d,%#x)", NULL, NULL },
#endif
#ifdef TARGET_NR_fsopen
{ TARGET_NR_fsopen, "fsopen", "%s(%s,%d)", NULL, NULL },
#endif
#if defined(TARGET_NR_fsconfig) && defined(NR_fsconfig)
{ TARGET_NR_fsconfig, "fsconfig", NULL, print_fsconfig, NULL },
#endif
#ifdef TARGET_NR_fsmount
{ TARGET_NR_fsmount, "fsmount", "%s(%d,%d,%d)", NULL, NULL },
#endif
#ifdef TARGET_NR_move_mount
{ TARGET_NR_move_mount, "move_mount", "%s(%d,%s,%d,%s,%d)", NULL, NULL },
#endif
#ifdef TARGET_NR_fspick
{ TARGET_NR_fspick, "fspick", "%s(%d,%s,%d)", NULL, NULL },
#endif