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authorJeff Dike <jdike@addtoit.com>2008-02-04 22:30:58 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:28 -0800
commit3e6f2ac480ce398ade2fd6b5e02d00d1265f1e0f (patch)
tree25f5589189170c20a765d4e6f0c56b42ad58ea20 /arch/um/include
parentd25f2e1235aab716c9fd6ba36c42503627a3a0e3 (diff)
uml: kill processes instead of panicing kernel
UML was panicing in the case of failures of libc calls which shouldn't happen. This is an overreaction since a failure from libc doesn't normally mean that kernel data structures are in an unknown state. Instead, the current process should just be killed if there is no way to recover. The case that prompted this was a failure of PTRACE_SETREGS restoring the same state that was read by PTRACE_GETREGS. It appears that when a process tries to load a bogus value into a segment register, it segfaults (as expected) and the value is actually loaded and is seen by PTRACE_GETREGS (not expected). This case is fixed by forcing a fatal SIGSEGV on the process so that it immediately dies. fatal_sigsegv was added for this purpose. It was declared as noreturn, so in order to pursuade gcc that it actually does not return, I added a call to os_dump_core (and declared it noreturn) so that I get a core file if somehow the process survives. All other calls in arch/um/os-Linux/skas/process.c got the same treatment, with failures causing the process to die instead of a kernel panic, with some exceptions. userspace_tramp exits with status 1 if anything goes wrong there. That will cause start_userspace to return an error. copy_context_skas0 and map_stub_pages also now return errors instead of panicing. Callers of thes functions were changed to check for errors and do something appropriate. Usually that's to return an error to their callers. check_skas3_ptrace_faultinfo just exits since that's too early to do anything else. save_registers, restore_registers, and init_registers now return status instead of panicing on failure, with their callers doing something appropriate. There were also duplicate declarations of save_registers and restore_registers in os.h - these are gone. I noticed and fixed up some whitespace damage. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/include')
-rw-r--r--arch/um/include/kern_util.h1
-rw-r--r--arch/um/include/os.h8
-rw-r--r--arch/um/include/registers.h6
3 files changed, 7 insertions, 8 deletions
diff --git a/arch/um/include/kern_util.h b/arch/um/include/kern_util.h
index 8fadf8962e3e..625ca2924a56 100644
--- a/arch/um/include/kern_util.h
+++ b/arch/um/include/kern_util.h
@@ -62,6 +62,7 @@ extern int singlestepping(void *t);
extern void segv_handler(int sig, struct uml_pt_regs *regs);
extern void bus_handler(int sig, struct uml_pt_regs *regs);
extern void winch(int sig, struct uml_pt_regs *regs);
+extern void fatal_sigsegv(void) __attribute__ ((noreturn));
#endif
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 69c0d4ad0e52..9428d34792ca 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -238,7 +238,7 @@ extern int raw(int fd);
extern void setup_machinename(char *machine_out);
extern void setup_hostinfo(char *buf, int len);
extern int setjmp_wrapper(void (*proc)(void *, void *), ...);
-extern void os_dump_core(void);
+extern void os_dump_core(void) __attribute__ ((noreturn));
/* time.c */
extern void idle_sleep(unsigned long long nsecs);
@@ -267,11 +267,9 @@ extern int protect(struct mm_id * mm_idp, unsigned long addr,
extern int is_skas_winch(int pid, int fd, void *data);
extern int start_userspace(unsigned long stub_stack);
extern int copy_context_skas0(unsigned long stack, int pid);
-extern void save_registers(int pid, struct uml_pt_regs *regs);
-extern void restore_registers(int pid, struct uml_pt_regs *regs);
extern void userspace(struct uml_pt_regs *regs);
-extern void map_stub_pages(int fd, unsigned long code,
- unsigned long data, unsigned long stack);
+extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
+ unsigned long stack);
extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
extern void switch_threads(jmp_buf *me, jmp_buf *you);
extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
diff --git a/arch/um/include/registers.h b/arch/um/include/registers.h
index 6df37480cb8c..9ea1ae3c8f46 100644
--- a/arch/um/include/registers.h
+++ b/arch/um/include/registers.h
@@ -13,9 +13,9 @@ extern int save_fp_registers(int pid, unsigned long *fp_regs);
extern int restore_fp_registers(int pid, unsigned long *fp_regs);
extern int save_fpx_registers(int pid, unsigned long *fp_regs);
extern int restore_fpx_registers(int pid, unsigned long *fp_regs);
-extern void save_registers(int pid, struct uml_pt_regs *regs);
-extern void restore_registers(int pid, struct uml_pt_regs *regs);
-extern void init_registers(int pid);
+extern int save_registers(int pid, struct uml_pt_regs *regs);
+extern int restore_registers(int pid, struct uml_pt_regs *regs);
+extern int init_registers(int pid);
extern void get_safe_registers(unsigned long *regs);
extern unsigned long get_thread_reg(int reg, jmp_buf *buf);