lwn.git/arch/um/os-Linux/mem.c, branch v4.13-rc6

um: Use os_warn to print out pre-boot warning/error messages

2017-07-05T21:18:25+00:00

Use os_warn() instead of printf/fprintf to print out pre-boot warning/error messages to stderr. Note that the help message and version message are kept to print out to stdout, because user explicitly specifies those options to get such information. Signed-off-by: Masami Hiramatsu Signed-off-by: Richard Weinberger

um: Use os_info for the messages on normal path

2017-07-05T21:17:42+00:00

Use os_info() for printing out the messages on the normal execution path. Signed-off-by: Masami Hiramatsu Signed-off-by: Richard Weinberger

um: Use race-free temporary file creation

2016-01-10T20:49:50+00:00

Open the memory mapped file with the O_TMPFILE flag when available. Signed-off-by: Mickaël Salaün Cc: Jeff Dike Cc: Richard Weinberger Acked-by: Tristan Schmelcher Signed-off-by: Richard Weinberger

um: Do not set unsecure permission for temporary file

2016-01-10T20:49:50+00:00

Remove the insecure 0777 mode for temporary file to prohibit other users to change the executable mapped code. An attacker could gain access to the mapped file descriptor from the temporary file (before it is unlinked) in a read-only mode but it should not be accessible in write mode to avoid arbitrary code execution. To not change the hostfs behavior, the temporary file creation permission now depends on the current umask(2) and the implementation of mkstemp(3). Signed-off-by: Mickaël Salaün Cc: Jeff Dike Cc: Richard Weinberger Acked-by: Tristan Schmelcher Signed-off-by: Richard Weinberger

uml: Simplify tempdir logic.

2014-04-20T21:10:44+00:00

Inferring the mount hierarchy correctly from /proc/mounts is hard when MS_MOVE may have been used, and the previous code did it wrongly. This change simplifies the logic to only require that /dev/shm be _on_ tmpfs (which can be checked trivially with statfs) rather than that it be a _mountpoint_ of tmpfs, since there isn't a compelling reason to be that strict. We also now check for tmpfs on whatever directory we ultimately use so that the user is better informed. This change also moves the more standard TMPDIR environment variable check ahead of the others. Applies to 3.12. Signed-off-by: Tristan Schmelcher Signed-off-by: Richard Weinberger

uml: Fix which_tmpdir failure when /dev/shm is a symlink, and in other edge cases

2013-07-19T08:45:18+00:00

which_tmpdir did the wrong thing if /dev/shm was a symlink (e.g., to /run/shm), if there were multiple mounts on top of each other, if the mount(s) were obscured by a later mount, or if /dev/shm was a prefix of another mount point. This fixes these cases. Applies to 3.9.6. Signed-off-by: Tristan Schmelcher Signed-off-by: Richard Weinberger

um: get rid of pointless include "..." where include <...> will do

2012-10-09T20:28:45+00:00

Signed-off-by: Al Viro Signed-off-by: Richard Weinberger

um: -include user.h for USER_OBJ, trim includes

2011-11-02T13:14:44+00:00

Signed-off-by: Al Viro Signed-off-by: Richard Weinberger

uml: free resources

2011-07-26T03:57:13+00:00

When creating the temp file there's a memory and file descriptor leak upon error. Signed-off-by: Davidlohr Bueso Signed-off-by: Richard Weinberger Reviewed-by: Vitaliy Ivanov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

um: os-linux/mem.c needs sys/stat.h

2010-06-29T22:29:32+00:00

The os-linux/mem.c file calls fchmod function, which is declared in sys/stat.h header file, so include it. Fixes build breakage under FC13. Signed-off-by: Liu Aleaxander Acked-by: Boaz Harrosh Cc: Jeff Dike Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds