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author | Ricardo Neri <ricardo.neri-calderon@linux.intel.com> | 2017-11-20 19:04:36 -0800 |
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committer | Ingo Molnar <mingo@kernel.org> | 2017-11-21 08:13:43 +0100 |
commit | fd11a6496e12848d4eeb21029c2c288bbc638048 (patch) | |
tree | 51215487b69dc90c4e479ba56240d4a245604152 /arch/x86/kernel/umip.c | |
parent | b4c0a7326f5dc0ef7a64128b0ae7d081f4b2cbd1 (diff) | |
download | linux-stable-fd11a6496e12848d4eeb21029c2c288bbc638048.tar.gz linux-stable-fd11a6496e12848d4eeb21029c2c288bbc638048.tar.bz2 linux-stable-fd11a6496e12848d4eeb21029c2c288bbc638048.zip |
x86/umip: Print a warning into the syslog if UMIP-protected instructions are used
Print a rate-limited warning when a user-space program attempts to execute
any of the instructions that UMIP protects (i.e., SGDT, SIDT, SLDT, STR
and SMSW).
This is useful, because when CONFIG_X86_INTEL_UMIP=y is selected and
supported by the hardware, user space programs that try to execute such
instructions will receive a SIGSEGV signal that they might not expect.
In the specific cases for which emulation is provided (instructions SGDT,
SIDT and SMSW in protected and virtual-8086 modes), no signal is
generated. However, a warning is helpful to encourage updates in such
programs to avoid the use of such instructions.
Warnings are printed via a customized printk() function that also provides
information about the program that attempted to use the affected
instructions.
Utility macros are defined to wrap umip_printk() for the error and warning
kernel log levels.
While here, replace an existing call to the generic rate-limited pr_err()
with the new umip_pr_err().
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: ricardo.neri@intel.com
Link: http://lkml.kernel.org/r/1511233476-17088-1-git-send-email-ricardo.neri-calderon@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/umip.c')
-rw-r--r-- | arch/x86/kernel/umip.c | 62 |
1 files changed, 58 insertions, 4 deletions
diff --git a/arch/x86/kernel/umip.c b/arch/x86/kernel/umip.c index 1f1f2d54dab5..dabbac30acdf 100644 --- a/arch/x86/kernel/umip.c +++ b/arch/x86/kernel/umip.c @@ -82,6 +82,57 @@ #define UMIP_INST_SLDT 3 /* 0F 00 /0 */ #define UMIP_INST_STR 4 /* 0F 00 /1 */ +const char * const umip_insns[5] = { + [UMIP_INST_SGDT] = "SGDT", + [UMIP_INST_SIDT] = "SIDT", + [UMIP_INST_SMSW] = "SMSW", + [UMIP_INST_SLDT] = "SLDT", + [UMIP_INST_STR] = "STR", +}; + +#define umip_pr_err(regs, fmt, ...) \ + umip_printk(regs, KERN_ERR, fmt, ##__VA_ARGS__) +#define umip_pr_warning(regs, fmt, ...) \ + umip_printk(regs, KERN_WARNING, fmt, ##__VA_ARGS__) + +/** + * umip_printk() - Print a rate-limited message + * @regs: Register set with the context in which the warning is printed + * @log_level: Kernel log level to print the message + * @fmt: The text string to print + * + * Print the text contained in @fmt. The print rate is limited to bursts of 5 + * messages every two minutes. The purpose of this customized version of + * printk() is to print messages when user space processes use any of the + * UMIP-protected instructions. Thus, the printed text is prepended with the + * task name and process ID number of the current task as well as the + * instruction and stack pointers in @regs as seen when entering kernel mode. + * + * Returns: + * + * None. + */ +static __printf(3, 4) +void umip_printk(const struct pt_regs *regs, const char *log_level, + const char *fmt, ...) +{ + /* Bursts of 5 messages every two minutes */ + static DEFINE_RATELIMIT_STATE(ratelimit, 2 * 60 * HZ, 5); + struct task_struct *tsk = current; + struct va_format vaf; + va_list args; + + if (!__ratelimit(&ratelimit)) + return; + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + printk("%s" pr_fmt("%s[%d] ip:%lx sp:%lx: %pV"), log_level, tsk->comm, + task_pid_nr(tsk), regs->ip, regs->sp, &vaf); + va_end(args); +} + /** * identify_insn() - Identify a UMIP-protected instruction * @insn: Instruction structure with opcode and ModRM byte. @@ -236,10 +287,8 @@ static void force_sig_info_umip_fault(void __user *addr, struct pt_regs *regs) if (!(show_unhandled_signals && unhandled_signal(tsk, SIGSEGV))) return; - pr_err_ratelimited("%s[%d] umip emulation segfault ip:%lx sp:%lx error:%x in %lx\n", - tsk->comm, task_pid_nr(tsk), regs->ip, - regs->sp, X86_PF_USER | X86_PF_WRITE, - regs->ip); + umip_pr_err(regs, "segfault in emulation. error%x\n", + X86_PF_USER | X86_PF_WRITE); } /** @@ -326,10 +375,15 @@ bool fixup_umip_exception(struct pt_regs *regs) if (umip_inst < 0) return false; + umip_pr_warning(regs, "%s instruction cannot be used by applications.\n", + umip_insns[umip_inst]); + /* Do not emulate SLDT, STR or user long mode processes. */ if (umip_inst == UMIP_INST_STR || umip_inst == UMIP_INST_SLDT || user_64bit_mode(regs)) return false; + umip_pr_warning(regs, "For now, expensive software emulation returns the result.\n"); + if (emulate_umip_insn(&insn, umip_inst, dummy_data, &dummy_data_size)) return false; |