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| author |   Mickaël Salaün <mic@digikod.net> | 2015-12-22 22:15:10 +0100 |
|---|---|---|
| committer |   Richard Weinberger <richard@nod.at> | 2016-01-10 21:49:50 +0100 |
| commit | 3e46b25376321db119bc8507ce8c8841c580e736 (patch) | |
| tree | 808f88738a6caae1bc28e10238f815471c0eca54 /arch/um | |
| parent | um: Do not set unsecure permission for temporary file (diff) | |
| download | linux-dev-3e46b25376321db119bc8507ce8c8841c580e736.tar.xz linux-dev-3e46b25376321db119bc8507ce8c8841c580e736.zip | |
um: Use race-free temporary file creation
Open the memory mapped file with the O_TMPFILE flag when available.
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Acked-by: Tristan Schmelcher <tschmelcher@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/os-Linux/mem.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c index 840d573f7e38..8b1767668515 100644 --- a/arch/um/os-Linux/mem.c +++ b/arch/um/os-Linux/mem.c @@ -106,6 +106,17 @@ static int __init make_tempfile(const char *template) } } +#ifdef O_TMPFILE + fd = open(tempdir, O_CLOEXEC | O_RDWR | O_EXCL | O_TMPFILE, 0700); + /* + * If the running system does not support O_TMPFILE flag then retry + * without it. + */ + if (fd != -1 || (errno != EINVAL && errno != EISDIR && + errno != EOPNOTSUPP)) + return fd; +#endif + tempname = malloc(strlen(tempdir) + strlen(template) + 1); if (tempname == NULL) return -1; |