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linux-user: Add strace support for printing arguments of syscalls used to lock and unlock memory 

This patch implements strace argument printing functionality for following syscalls:

    * mlock, munlock, mlockall, munlockall - lock and unlock memory

       int mlock(const void *addr, size_t len)
       int munlock(const void *addr, size_t len)
       int mlockall(int flags)
       int munlockall(void)
       man page: https://man7.org/linux/man-pages/man2/mlock.2.html

Implementation notes:

    Syscall mlockall() takes an argument that is composed of predefined values
    which represent flags that determine the type of locking operation that is
    to be performed. For that reason, a printing function "print_mlockall" was
    stated in file "strace.list". This printing function uses an already existing
    function "print_flags()" to print the "flags" argument.  These flags are stated
    inside an array "mlockall_flags" that contains values of type "struct flags".
    These values are instantiated using an existing macro "FLAG_TARGET()" that
    crates aproppriate target flag values based on those defined in files
    '/target_syscall.h'. These target flag values were changed from
    "TARGET_MLOCKALL_MCL*" to "TARGET_MCL_*" so that they can be aproppriately set
    and recognised in "strace.c" with "FLAG_TARGET()". Value for "MCL_ONFAULT"
    was added in this patch. This value was also added in "syscall.c" in function
    "target_to_host_mlockall_arg()". Because this flag value was added in kernel
    version 4.4, it is enwrapped in an #ifdef directive (both in "syscall.c" and
    in "strace.c") as to support older kernel versions.
    The other syscalls have only primitive argument types, so the
    rest of the implementation was handled by stating an appropriate
    printing format in file "strace.list". Syscall mlock2() is not implemented in
    "syscall.c" and thus it's argument printing is not implemented in this patch.

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200811164553.27713-4-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Filip Bozuta 2020-08-11 18:45:51 +02:00 committed by Laurent Vivier
parent 7c89f34383
commit 02e5d7d78e
24 changed files with 97 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
linux-user/aarch64/target_syscall.h
View File

@ -16,8 +16,9 @@ struct target_pt_regs {
#define UNAME_MINIMUM_RELEASE "3.8.0"
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define TARGET_PR_SVE_SET_VL 50
#define TARGET_PR_SVE_GET_VL 51

5
linux-user/alpha/target_syscall.h
View File

@ -258,7 +258,8 @@ struct target_pt_regs {
#define TARGET_UAC_NOFIX 2
#define TARGET_UAC_SIGBUS 4
#define TARGET_MINSIGSTKSZ 4096
#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
#define TARGET_MLOCKALL_MCL_FUTURE 0x4000
#define TARGET_MCL_CURRENT 0x2000
#define TARGET_MCL_FUTURE 0x4000
#define TARGET_MCL_ONFAULT 0x8000
#endif /* ALPHA_TARGET_SYSCALL_H */

6
linux-user/arm/target_syscall.h
View File

@ -28,8 +28,10 @@ struct target_pt_regs {
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define TARGET_WANT_OLD_SYS_SELECT
#define TARGET_FORCE_SHMLBA

5
linux-user/cris/target_syscall.h
View File

@ -40,7 +40,8 @@ struct target_pt_regs {
#define TARGET_CLONE_BACKWARDS2
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#endif

5
linux-user/hppa/target_syscall.h
View File

@ -23,8 +23,9 @@ struct target_pt_regs {
#define UNAME_MINIMUM_RELEASE "2.6.32"
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#undef TARGET_ENOMSG
#define TARGET_ENOMSG 35

5
linux-user/i386/target_syscall.h
View File

@ -151,8 +151,9 @@ struct target_vm86plus_struct {
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define TARGET_WANT_OLD_SYS_SELECT
#endif /* I386_TARGET_SYSCALL_H */

6
linux-user/m68k/target_syscall.h
View File

@ -21,9 +21,9 @@ struct target_pt_regs {
#define UNAME_MINIMUM_RELEASE "2.6.32"
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define TARGET_WANT_OLD_SYS_SELECT
#endif /* M68K_TARGET_SYSCALL_H */

5
linux-user/microblaze/target_syscall.h
View File

@ -50,8 +50,9 @@ struct target_pt_regs {
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define TARGET_WANT_NI_OLD_SELECT

5
linux-user/mips/target_syscall.h
View File

@ -234,8 +234,9 @@ struct target_pt_regs {
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define TARGET_FORCE_SHMLBA

5
linux-user/mips64/target_syscall.h
View File

@ -231,8 +231,9 @@ struct target_pt_regs {
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define TARGET_FORCE_SHMLBA

5
linux-user/nios2/target_syscall.h
View File

@ -31,7 +31,8 @@ struct target_pt_regs {
};
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#endif /* NIOS2_TARGET_SYSCALL_H */

5
linux-user/openrisc/target_syscall.h
View File

@ -16,8 +16,9 @@ struct target_pt_regs {
#define UNAME_MINIMUM_RELEASE "2.6.32"
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define MMAP_SHIFT TARGET_PAGE_BITS

5
linux-user/ppc/target_syscall.h
View File

@ -72,8 +72,9 @@ struct target_revectored_struct {
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
#define TARGET_MLOCKALL_MCL_FUTURE 0x4000
#define TARGET_MCL_CURRENT 0x2000
#define TARGET_MCL_FUTURE 0x4000
#define TARGET_MCL_ONFAULT 0x8000
#define TARGET_WANT_NI_OLD_SELECT
#endif /* PPC_TARGET_SYSCALL_H */

5
linux-user/riscv/target_syscall.h
View File

@ -51,8 +51,9 @@ struct target_pt_regs {
#define UNAME_MINIMUM_RELEASE "4.15.0"
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
/* clone(flags, newsp, ptidptr, tls, ctidptr) for RISC-V */
/* This comes from linux/kernel/fork.c, CONFIG_CLONE_BACKWARDS */

5
linux-user/s390x/target_syscall.h
View File

@ -28,7 +28,8 @@ struct target_pt_regs {
#define TARGET_CLONE_BACKWARDS2
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#endif /* S390X_TARGET_SYSCALL_H */

5
linux-user/sh4/target_syscall.h
View File

@ -16,8 +16,9 @@ struct target_pt_regs {
#define UNAME_MINIMUM_RELEASE "2.6.32"
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define TARGET_FORCE_SHMLBA

5
linux-user/sparc/target_syscall.h
View File

@ -21,8 +21,9 @@ struct target_pt_regs {
*/
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 4096
#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
#define TARGET_MLOCKALL_MCL_FUTURE 0x4000
#define TARGET_MCL_CURRENT 0x2000
#define TARGET_MCL_FUTURE 0x4000
#define TARGET_MCL_ONFAULT 0x8000
/* For SPARC SHMLBA is determined at runtime in the kernel, and
* libc has to runtime-detect it using the hwcaps (see glibc

5
linux-user/sparc64/target_syscall.h
View File

@ -22,8 +22,9 @@ struct target_pt_regs {
*/
#define TARGET_CLONE_BACKWARDS
#define TARGET_MINSIGSTKSZ 4096
#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
#define TARGET_MLOCKALL_MCL_FUTURE 0x4000
#define TARGET_MCL_CURRENT 0x2000
#define TARGET_MCL_FUTURE 0x4000
#define TARGET_MCL_ONFAULT 0x8000
#define TARGET_FORCE_SHMLBA

21
linux-user/strace.c
View File

@ -1198,6 +1198,15 @@ UNUSED static struct flags falloc_flags[] = {
#endif
};
UNUSED static struct flags mlockall_flags[] = {
FLAG_TARGET(MCL_CURRENT),
FLAG_TARGET(MCL_FUTURE),
#ifdef MCL_ONFAULT
FLAG_TARGET(MCL_ONFAULT),
#endif
FLAG_END,
};
/*
* print_xxx utility functions. These are used to print syscall
* parameters in certain format. All of these have parameter
@ -2009,6 +2018,18 @@ print_ftruncate64(void *cpu_env, const struct syscallname *name,
}
#endif
#ifdef TARGET_NR_mlockall
static void
print_mlockall(void *cpu_env, const struct syscallname *name,
abi_long arg0, abi_long arg1, abi_long arg2,
abi_long arg3, abi_long arg4, abi_long arg5)
{
print_syscall_prologue(name);
print_flags(mlockall_flags, arg0, 1);
print_syscall_epilogue(name);
}
#endif
#if defined(TARGET_NR_socket)
static void
print_socket(void *cpu_env, const struct syscallname *name,

8
linux-user/strace.list
View File

@ -568,13 +568,13 @@
{ TARGET_NR_mknodat, "mknodat" , NULL, print_mknodat, NULL },
#endif
#ifdef TARGET_NR_mlock
{ TARGET_NR_mlock, "mlock" , NULL, NULL, NULL },
{ TARGET_NR_mlock, "mlock" , "%s(%p," TARGET_FMT_lu ")", NULL, NULL },
#endif
#ifdef TARGET_NR_mlock2
{ TARGET_NR_mlock2, "mlock2" , NULL, NULL, NULL },
#endif
#ifdef TARGET_NR_mlockall
{ TARGET_NR_mlockall, "mlockall" , NULL, NULL, NULL },
{ TARGET_NR_mlockall, "mlockall" , NULL, print_mlockall, NULL },
#endif
#ifdef TARGET_NR_mmap
{ TARGET_NR_mmap, "mmap" , NULL, print_mmap, print_syscall_ret_addr },
@ -637,10 +637,10 @@
{ TARGET_NR_multiplexer, "multiplexer" , NULL, NULL, NULL },
#endif
#ifdef TARGET_NR_munlock
{ TARGET_NR_munlock, "munlock" , NULL, NULL, NULL },
{ TARGET_NR_munlock, "munlock" , "%s(%p," TARGET_FMT_lu ")", NULL, NULL },
#endif
#ifdef TARGET_NR_munlockall
{ TARGET_NR_munlockall, "munlockall" , NULL, NULL, NULL },
{ TARGET_NR_munlockall, "munlockall" , "%s()", NULL, NULL },
#endif
#ifdef TARGET_NR_munmap
{ TARGET_NR_munmap, "munmap" , NULL, print_munmap, NULL },

10
linux-user/syscall.c
View File

@ -6975,12 +6975,18 @@ static inline int target_to_host_mlockall_arg(int arg)
{
int result = 0;
if (arg & TARGET_MLOCKALL_MCL_CURRENT) {
if (arg & TARGET_MCL_CURRENT) {
result |= MCL_CURRENT;
}
if (arg & TARGET_MLOCKALL_MCL_FUTURE) {
if (arg & TARGET_MCL_FUTURE) {
result |= MCL_FUTURE;
}
#ifdef MCL_ONFAULT
if (arg & TARGET_MCL_ONFAULT) {
result |= MCL_ONFAULT;
}
#endif
return result;
}
#endif

5
linux-user/tilegx/target_syscall.h
View File

@ -34,8 +34,9 @@ struct target_pt_regs {
tilegx_reg_t pad[2];
};
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
/* For faultnum */
#define TARGET_INT_SWINT_1 14

5
linux-user/x86_64/target_syscall.h
View File

@ -101,7 +101,8 @@ struct target_msqid64_ds {
#define TARGET_ARCH_GET_FS 0x1003
#define TARGET_ARCH_GET_GS 0x1004
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#endif /* X86_64_TARGET_SYSCALL_H */

5
linux-user/xtensa/target_syscall.h
View File

@ -43,7 +43,8 @@ struct target_pt_regs {
xtensa_reg_t areg[16];
};
#define TARGET_MLOCKALL_MCL_CURRENT 1
#define TARGET_MLOCKALL_MCL_FUTURE 2
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#endif