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| author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2006-11-25 11:09:39 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-11-25 13:28:34 -0800 |
| commit | 5d48545e5e88ab7a27ba6a5cb1e8fff617754b61 (patch) | |
| tree | 2da1a8d8e1ca4088cd91cc080f424b3e25e9423f /arch/um/os-Linux/Makefile | |
| parent | 9dce447a542d8b4bedf13d6a4c4fc6737240372e (diff) | |
| download | kernel_samsung_smdk4412-5d48545e5e88ab7a27ba6a5cb1e8fff617754b61.zip kernel_samsung_smdk4412-5d48545e5e88ab7a27ba6a5cb1e8fff617754b61.tar.gz kernel_samsung_smdk4412-5d48545e5e88ab7a27ba6a5cb1e8fff617754b61.tar.bz2 | |
[PATCH] uml: make execvp safe for our usage
Reimplement execvp for our purposes - after we call fork() it is fundamentally
unsafe to use the kernel allocator - current is not valid there. So we simply
pass to our modified execvp() a preallocated buffer. This fixes a real bug
and works very well in testing (I've seen indirectly warning messages from the
forked thread - they went on the pipe connected to its stdout and where read
as a number by UML, when calling read_output(). I verified the obtained
number corresponded to "BUG:").
The added use of __cant_sleep() is not a new bug since __cant_sleep() is
already used in the same function - passing an atomicity parameter would be
better but it would require huge change, stating that this function must not
be called in atomic context and can sleep is a better idea (will make sure of
this gradually).
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/os-Linux/Makefile')
| -rw-r--r-- | arch/um/os-Linux/Makefile | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile index b418392..2f8c794 100644 --- a/arch/um/os-Linux/Makefile +++ b/arch/um/os-Linux/Makefile @@ -3,8 +3,8 @@ # Licensed under the GPL # -obj-y = aio.o elf_aux.o file.o helper.o irq.o main.o mem.o process.o sigio.o \ - signal.o start_up.o time.o trap.o tty.o uaccess.o umid.o tls.o \ +obj-y = aio.o elf_aux.o execvp.o file.o helper.o irq.o main.o mem.o process.o \ + sigio.o signal.o start_up.o time.o trap.o tty.o uaccess.o umid.o tls.o \ user_syms.o util.o drivers/ sys-$(SUBARCH)/ obj-$(CONFIG_MODE_SKAS) += skas/ @@ -15,9 +15,9 @@ user-objs-$(CONFIG_MODE_TT) += tt.o obj-$(CONFIG_TTY_LOG) += tty_log.o user-objs-$(CONFIG_TTY_LOG) += tty_log.o -USER_OBJS := $(user-objs-y) aio.o elf_aux.o file.o helper.o irq.o main.o mem.o \ - process.o sigio.o signal.o start_up.o time.o trap.o tty.o tls.o \ - uaccess.o umid.o util.o +USER_OBJS := $(user-objs-y) aio.o elf_aux.o execvp.o file.o helper.o irq.o \ + main.o mem.o process.o sigio.o signal.o start_up.o time.o trap.o tty.o \ + tls.o uaccess.o umid.o util.o CFLAGS_user_syms.o += -DSUBARCH_$(SUBARCH) |