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Commit d9838d86 authored by Bodo Stroesser's avatar Bodo Stroesser Committed by Linus Torvalds
Browse files

[PATCH] uml: allow host capability usage to be disabled 



Add new cmdline setups:
  - noprocmm
  - noptracefaultinfo
In case of testing, they can be used to switch off usage of
/proc/mm and PTRACE_FAULTINFO independently.

Signed-off-by: default avatarBodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: default avatarJeff Dike <jdike@addtoit.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 07bf731e

arch/um/os-Linux/start_up.c

+24 −0
Original line number Original line Diff line number Diff line
@@ -275,6 +275,30 @@ void os_early_checks(void) 
	check_ptrace();

	check_ptrace();

}

}





static int __init noprocmm_cmd_param(char *str, int* add)

{

	proc_mm = 0;

	return 0;

}



__uml_setup("noprocmm", noprocmm_cmd_param,

"noprocmm\n"

"    Turns off usage of /proc/mm, even if host supports it.\n"

"    To support /proc/mm, the host needs to be patched using\n"

"    the current skas3 patch.\n\n");



static int __init noptracefaultinfo_cmd_param(char *str, int* add)

{

	ptrace_faultinfo = 0;

	return 0;

}



__uml_setup("noptracefaultinfo", noptracefaultinfo_cmd_param,

"noptracefaultinfo\n"

"    Turns off usage of PTRACE_FAULTINFO, even if host supports\n"

"    it. To support PTRACE_FAULTINFO, the host needs to be patched\n"

"    using the current skas3 patch.\n\n");



#ifdef UML_CONFIG_MODE_SKAS

#ifdef UML_CONFIG_MODE_SKAS

static inline void check_skas3_ptrace_support(void)

static inline void check_skas3_ptrace_support(void)

{

{