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Message-ID: <202404302220.EkdfEBSB-lkp@intel.com>
Date: Tue, 30 Apr 2024 22:53:34 +0800
From: kernel test robot <lkp@...el.com>
To: Ingo Molnar <mingo@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: oe-kbuild-all@...ts.linux.dev, LKML <linux-kernel@...r.kernel.org>,
Hillf Danton <hdanton@...a.com>,
Andy Lutomirski <luto@...capital.net>, Peter Anvin <hpa@...or.com>,
Adrian Bunk <bunk@...nel.org>,
syzbot <syzbot+83e7f982ca045ab4405c@...kaller.appspotmail.com>,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
andrii@...nel.org, bpf@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] x86/mm: Remove broken vsyscall emulation code from the
page fault code
Hi Ingo,
kernel test robot noticed the following build warnings:
[auto build test WARNING on linux/master]
[also build test WARNING on tip/x86/mm linus/master v6.9-rc6 next-20240430]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Ingo-Molnar/x86-mm-Remove-broken-vsyscall-emulation-code-from-the-page-fault-code/20240430-135258
base: linux/master
patch link: https://lore.kernel.org/r/Zi9Ts1HcqiKzy9GX%40gmail.com
patch subject: [PATCH] x86/mm: Remove broken vsyscall emulation code from the page fault code
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20240430/202404302220.EkdfEBSB-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240430/202404302220.EkdfEBSB-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404302220.EkdfEBSB-lkp@intel.com/
All warnings (new ones prefixed by >>):
arch/x86/entry/vsyscall/vsyscall_64.c: In function 'emulate_vsyscall':
>> arch/x86/entry/vsyscall/vsyscall_64.c:118:29: warning: variable 'tsk' set but not used [-Wunused-but-set-variable]
118 | struct task_struct *tsk;
| ^~~
vim +/tsk +118 arch/x86/entry/vsyscall/vsyscall_64.c
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 114
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 115 bool emulate_vsyscall(unsigned long error_code,
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 116 struct pt_regs *regs, unsigned long address)
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 117 {
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 @118 struct task_struct *tsk;
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 119 unsigned long caller;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 120 int vsyscall_nr, syscall_nr, tmp;
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 121 long ret;
fa697140f9a201 arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-05 122 unsigned long orig_dx;
7460ed2844ffad arch/x86_64/kernel/vsyscall.c John Stultz 2007-02-16 123
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 124 /* Write faults or kernel-privilege faults never get fixed up. */
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 125 if ((error_code & (X86_PF_WRITE | X86_PF_USER)) != X86_PF_USER)
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 126 return false;
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 127
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 128 if (!(error_code & X86_PF_INSTR)) {
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 129 /* Failed vsyscall read */
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 130 if (vsyscall_mode == EMULATE)
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 131 return false;
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 132
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 133 /*
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 134 * User code tried and failed to read the vsyscall page.
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 135 */
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 136 warn_bad_vsyscall(KERN_INFO, regs, "vsyscall read attempt denied -- look up the vsyscall kernel parameter if you need a workaround");
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 137 return false;
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 138 }
918ce325098a4e arch/x86/entry/vsyscall/vsyscall_64.c Andy Lutomirski 2019-06-26 139
c9712944b2a123 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-07-13 140 /*
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 141 * No point in checking CS -- the only way to get here is a user mode
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 142 * trap to a high address, which means that we're in 64-bit user code.
c9712944b2a123 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-07-13 143 */
7460ed2844ffad arch/x86_64/kernel/vsyscall.c John Stultz 2007-02-16 144
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 145 WARN_ON_ONCE(address != regs->ip);
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 146
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 147 if (vsyscall_mode == NONE) {
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 148 warn_bad_vsyscall(KERN_INFO, regs,
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 149 "vsyscall attempted with vsyscall=none");
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 150 return false;
c9712944b2a123 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-07-13 151 }
7460ed2844ffad arch/x86_64/kernel/vsyscall.c John Stultz 2007-02-16 152
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 153 vsyscall_nr = addr_to_vsyscall_nr(address);
c149a665ac488e arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-03 154
c149a665ac488e arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-03 155 trace_emulate_vsyscall(vsyscall_nr);
c149a665ac488e arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-03 156
c9712944b2a123 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-07-13 157 if (vsyscall_nr < 0) {
c9712944b2a123 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-07-13 158 warn_bad_vsyscall(KERN_WARNING, regs,
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 159 "misaligned vsyscall (exploit attempt or buggy program) -- look up the vsyscall kernel parameter if you need a workaround");
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 160 goto sigsegv;
7460ed2844ffad arch/x86_64/kernel/vsyscall.c John Stultz 2007-02-16 161 }
7460ed2844ffad arch/x86_64/kernel/vsyscall.c John Stultz 2007-02-16 162
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 163 if (get_user(caller, (unsigned long __user *)regs->sp) != 0) {
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 164 warn_bad_vsyscall(KERN_WARNING, regs,
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 165 "vsyscall with bad stack (exploit attempt?)");
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 166 goto sigsegv;
^1da177e4c3f41 arch/x86_64/kernel/vsyscall.c Linus Torvalds 2005-04-16 167 }
^1da177e4c3f41 arch/x86_64/kernel/vsyscall.c Linus Torvalds 2005-04-16 168
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 169 tsk = current;
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 170
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 171 /*
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 172 * Check for access_ok violations and find the syscall nr.
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 173 *
46ed99d1b7c929 arch/x86/kernel/vsyscall_64.c Emil Goode 2012-04-01 174 * NULL is a valid user pointer (in the access_ok sense) on 32-bit and
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 175 * 64-bit, so we don't need to special-case it here. For all the
46ed99d1b7c929 arch/x86/kernel/vsyscall_64.c Emil Goode 2012-04-01 176 * vsyscalls, NULL means "don't write anything" not "write it at
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 177 * address 0".
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 178 */
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 179 switch (vsyscall_nr) {
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 180 case 0:
ddccf40fe82b7a arch/x86/entry/vsyscall/vsyscall_64.c Arnd Bergmann 2017-11-23 181 if (!write_ok_or_segv(regs->di, sizeof(struct __kernel_old_timeval)) ||
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 182 !write_ok_or_segv(regs->si, sizeof(struct timezone))) {
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 183 ret = -EFAULT;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 184 goto check_fault;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 185 }
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 186
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 187 syscall_nr = __NR_gettimeofday;
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 188 break;
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 189
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 190 case 1:
21346564ccad17 arch/x86/entry/vsyscall/vsyscall_64.c Arnd Bergmann 2019-11-05 191 if (!write_ok_or_segv(regs->di, sizeof(__kernel_old_time_t))) {
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 192 ret = -EFAULT;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 193 goto check_fault;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 194 }
5651721edec25b arch/x86/kernel/vsyscall_64.c Will Drewry 2012-07-13 195
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 196 syscall_nr = __NR_time;
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 197 break;
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 198
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 199 case 2:
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 200 if (!write_ok_or_segv(regs->di, sizeof(unsigned)) ||
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 201 !write_ok_or_segv(regs->si, sizeof(unsigned))) {
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 202 ret = -EFAULT;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 203 goto check_fault;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 204 }
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 205
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 206 syscall_nr = __NR_getcpu;
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 207 break;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 208 }
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 209
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 210 /*
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 211 * Handle seccomp. regs->ip must be the original value.
5fb94e9ca333f0 arch/x86/entry/vsyscall/vsyscall_64.c Mauro Carvalho Chehab 2018-05-08 212 * See seccomp_send_sigsys and Documentation/userspace-api/seccomp_filter.rst.
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 213 *
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 214 * We could optimize the seccomp disabled case, but performance
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 215 * here doesn't matter.
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 216 */
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 217 regs->orig_ax = syscall_nr;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 218 regs->ax = -ENOSYS;
fefad9ef58ffc2 arch/x86/entry/vsyscall/vsyscall_64.c Christian Brauner 2019-09-24 219 tmp = secure_computing();
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 220 if ((!tmp && regs->orig_ax != syscall_nr) || regs->ip != address) {
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 221 warn_bad_vsyscall(KERN_DEBUG, regs,
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 222 "seccomp tried to change syscall nr or ip");
fcb116bc43c8c3 arch/x86/entry/vsyscall/vsyscall_64.c Eric W. Biederman 2021-11-18 223 force_exit_sig(SIGSYS);
695dd0d634df89 arch/x86/entry/vsyscall/vsyscall_64.c Eric W. Biederman 2021-10-20 224 return true;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 225 }
26893107aa717c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2014-11-04 226 regs->orig_ax = -1;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 227 if (tmp)
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 228 goto do_ret; /* skip requested */
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 229
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 230 /*
198d72414c92c7 arch/x86/entry/vsyscall/vsyscall_64.c Ingo Molnar 2024-04-29 231 * With a real vsyscall, page faults cause SIGSEGV.
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 232 */
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 233 ret = -EFAULT;
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 234 switch (vsyscall_nr) {
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 235 case 0:
fa697140f9a201 arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-05 236 /* this decodes regs->di and regs->si on its own */
d5a00528b58cdb arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-09 237 ret = __x64_sys_gettimeofday(regs);
5651721edec25b arch/x86/kernel/vsyscall_64.c Will Drewry 2012-07-13 238 break;
5651721edec25b arch/x86/kernel/vsyscall_64.c Will Drewry 2012-07-13 239
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 240 case 1:
fa697140f9a201 arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-05 241 /* this decodes regs->di on its own */
d5a00528b58cdb arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-09 242 ret = __x64_sys_time(regs);
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 243 break;
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 244
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 245 case 2:
fa697140f9a201 arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-05 246 /* while we could clobber regs->dx, we didn't in the past... */
fa697140f9a201 arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-05 247 orig_dx = regs->dx;
fa697140f9a201 arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-05 248 regs->dx = 0;
fa697140f9a201 arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-05 249 /* this decodes regs->di, regs->si and regs->dx on its own */
d5a00528b58cdb arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-09 250 ret = __x64_sys_getcpu(regs);
fa697140f9a201 arch/x86/entry/vsyscall/vsyscall_64.c Dominik Brodowski 2018-04-05 251 regs->dx = orig_dx;
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 252 break;
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 253 }
8c73626ab28527 arch/x86/kernel/vsyscall_64.c John Stultz 2010-07-13 254
87b526d349b04c arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2012-10-01 255 check_fault:
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 256 if (ret == -EFAULT) {
4fc3490114bb15 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-11-07 257 /* Bad news -- userspace fed a bad pointer to a vsyscall. */
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 258 warn_bad_vsyscall(KERN_INFO, regs,
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 259 "vsyscall fault (exploit attempt?)");
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 260 goto sigsegv;
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 261 }
8c73626ab28527 arch/x86/kernel/vsyscall_64.c John Stultz 2010-07-13 262
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 263 regs->ax = ret;
8c73626ab28527 arch/x86/kernel/vsyscall_64.c John Stultz 2010-07-13 264
5651721edec25b arch/x86/kernel/vsyscall_64.c Will Drewry 2012-07-13 265 do_ret:
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 266 /* Emulate a ret instruction. */
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 267 regs->ip = caller;
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 268 regs->sp += 8;
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 269 return true;
c08c820508233b arch/x86_64/kernel/vsyscall.c Vojtech Pavlik 2006-09-26 270
5cec93c216db77 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-06-05 271 sigsegv:
3cf5d076fb4d48 arch/x86/entry/vsyscall/vsyscall_64.c Eric W. Biederman 2019-05-23 272 force_sig(SIGSEGV);
3ae36655b97a03 arch/x86/kernel/vsyscall_64.c Andy Lutomirski 2011-08-10 273 return true;
^1da177e4c3f41 arch/x86_64/kernel/vsyscall.c Linus Torvalds 2005-04-16 274 }
^1da177e4c3f41 arch/x86_64/kernel/vsyscall.c Linus Torvalds 2005-04-16 275
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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