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pstree: make it NOEXEC

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While at it, documet why ps can't be NOEXEC.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-08-05 22:25:00 +02:00
parent 99125c0495
commit 00c1811d87
3 changed files with 16 additions and 15 deletions
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4
NOFORK_NOEXEC.lst
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@ -269,9 +269,9 @@ poweroff - rare
powertop - interactive, longterm
printenv - NOFORK
printf - NOFORK
ps - noexec candidate
ps - looks for AT_CLKTCK elf aux vector, therefore can't be noexec
pscan - longterm
pstree
pstree - noexec
pwd - NOFORK
pwdx - NOFORK
raidautorun

24
procps/ps.c
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@ -15,7 +15,7 @@
//config: ps gives a snapshot of the current processes.
//config:
//config:config FEATURE_PS_WIDE
//config: bool "Enable wide output option (-w)"
//config: bool "Enable wide output (-w)"
//config: default y
//config: depends on PS && !DESKTOP
//config: help
@ -24,7 +24,7 @@
//config: than once, the length is unlimited.
//config:
//config:config FEATURE_PS_LONG
//config: bool "Enable long output option (-l)"
//config: bool "Enable long output (-l)"
//config: default y
//config: depends on PS && !DESKTOP
//config: help
@ -32,11 +32,16 @@
//config: Adds fields PPID, RSS, START, TIME & TTY
//config:
//config:config FEATURE_PS_TIME
//config: bool "Support -o time and -o etime output specifiers"
//config: bool "Enable -o time and -o etime specifiers"
//config: default y
//config: depends on PS && DESKTOP
//config: select PLATFORM_LINUX
//config:
//config:config FEATURE_PS_ADDITIONAL_COLUMNS
//config: bool "Enable -o rgroup, -o ruser, -o nice specifiers"
//config: default y
//config: depends on PS && DESKTOP
//config:
//config:config FEATURE_PS_UNUSUAL_SYSTEMS
//config: bool "Support Linux prior to 2.4.0 and non-ELF systems"
//config: default n
@ -44,13 +49,9 @@
//config: help
//config: Include support for measuring HZ on old kernels and non-ELF systems
//config: (if you are on Linux 2.4.0+ and use ELF, you don't need this)
//config:
//config:config FEATURE_PS_ADDITIONAL_COLUMNS
//config: bool "Support -o rgroup, -o ruser, -o nice specifiers"
//config: default y
//config: depends on PS && DESKTOP
//applet:IF_PS(APPLET(ps, BB_DIR_BIN, BB_SUID_DROP))
/* can't be NOEXEC: uses ELF aux vector. To have it, we must be a normal, execed process */
//kbuild:lib-$(CONFIG_PS) += ps.o
@ -202,6 +203,7 @@ struct globals {
#if ENABLE_FEATURE_PS_TIME
/* for ELF executables, notes are pushed before environment and args */
/* try "LD_SHOW_AUXV=1 /bin/true" */
static uintptr_t find_elf_note(uintptr_t findme)
{
uintptr_t *ep = (uintptr_t *) environ;
@ -217,7 +219,7 @@ static uintptr_t find_elf_note(uintptr_t findme)
return -1;
}
#if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
# if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
static unsigned get_HZ_by_waiting(void)
{
struct timeval tv1, tv2;
@ -260,13 +262,13 @@ static unsigned get_HZ_by_waiting(void)
return r;
}
#else
# else
static inline unsigned get_HZ_by_waiting(void)
{
/* Better method? */
return 100;
}
#endif
# endif
static unsigned get_kernel_HZ(void)
{

3
procps/pstree.c
View File

@ -9,14 +9,13 @@
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config PSTREE
//config: bool "pstree (9.4 kb)"
//config: default y
//config: help
//config: Display a tree of processes.
//applet:IF_PSTREE(APPLET(pstree, BB_DIR_USR_BIN, BB_SUID_DROP))
//applet:IF_PSTREE(APPLET_NOEXEC(pstree, pstree, BB_DIR_USR_BIN, BB_SUID_DROP, pstree))
//kbuild:lib-$(CONFIG_PSTREE) += pstree.o