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| author | Arnd Bergmann <arnd@arndb.de> | 2006-10-02 02:18:26 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-02 07:57:23 -0700 |
| commit | 6760856791c6e527da678021ee6a67896549d4da (patch) | |
| tree | 31bf78dac3a2ea68282ae394aeedb15bc92ae7d7 /lib | |
| parent | 2453a3062d36f39f01302f9f1ad18e7a0c54fe38 (diff) | |
| download | linux-stable-6760856791c6e527da678021ee6a67896549d4da.tar.gz linux-stable-6760856791c6e527da678021ee6a67896549d4da.tar.bz2 linux-stable-6760856791c6e527da678021ee6a67896549d4da.zip | |
[PATCH] introduce kernel_execve
The use of execve() in the kernel is dubious, since it relies on the
__KERNEL_SYSCALLS__ mechanism that stores the result in a global errno
variable. As a first step of getting rid of this, change all users to a
global kernel_execve function that returns a proper error code.
This function is a terrible hack, and a later patch removes it again after the
kernel syscalls are gone.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Hirokazu Takata <takata.hirokazu@renesas.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Makefile | 2 | ||||
| -rw-r--r-- | lib/execve.c | 23 |
2 files changed, 25 insertions, 0 deletions
diff --git a/lib/Makefile b/lib/Makefile index ddf3e676e1f4..4d752be0edc0 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -35,6 +35,8 @@ ifneq ($(CONFIG_HAVE_DEC_LOCK),y) lib-y += dec_and_lock.o endif +lib-y += execve.o + obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o obj-$(CONFIG_CRC16) += crc16.o obj-$(CONFIG_CRC32) += crc32.o diff --git a/lib/execve.c b/lib/execve.c new file mode 100644 index 000000000000..2667ebc15045 --- /dev/null +++ b/lib/execve.c @@ -0,0 +1,23 @@ +#include <asm/bug.h> +#include <asm/uaccess.h> + +#define __KERNEL_SYSCALLS__ +static int errno __attribute__((unused)); +#include <asm/unistd.h> + +#ifdef _syscall3 +int kernel_execve (const char *filename, char *const argv[], char *const envp[]) + __attribute__((__weak__)); +int kernel_execve (const char *filename, char *const argv[], char *const envp[]) +{ + mm_segment_t fs = get_fs(); + int ret; + + WARN_ON(segment_eq(fs, USER_DS)); + ret = execve(filename, (char **)argv, (char **)envp); + if (ret) + ret = -errno; + + return ret; +} +#endif |