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restrict who can setxattr the pseudo file. closes #64

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This commit is contained in:
Antonio SJ Musumeci 2015-03-13 20:31:02 -04:00
parent 4ea49fcfbb
commit 4b204b8fba
2 changed files with 16 additions and 11 deletions
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6
src/getattr.cpp
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@ -48,10 +48,10 @@ _getattr_controlfile(struct stat &buf)
buf.st_dev = 0;
buf.st_ino = 0;
buf.st_mode = (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
buf.st_mode = (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH);
buf.st_nlink = 1;
buf.st_uid = ::geteuid();
buf.st_gid = ::getegid();
buf.st_uid = ::getuid();
buf.st_gid = ::getgid();
buf.st_rdev = 0;
buf.st_size = 0;
buf.st_blksize = 1024;

21
src/setxattr.cpp
View File

@ -282,18 +282,23 @@ namespace mergerfs
size_t attrvalsize,
int flags)
{
const config::Config &config = config::get();
const config::Config &config = config::get();
const struct fuse_context *fc = fuse_get_context();
if(fusepath == config.controlfile)
return _setxattr_controlfile(config::get_writable(),
attrname,
string(attrval,attrvalsize),
flags);
{
if((fc->uid != ::getuid()) && (fc->gid != ::getgid()))
return -EPERM;
return _setxattr_controlfile(config::get_writable(),
attrname,
string(attrval,attrvalsize),
flags);
}
{
const struct fuse_context *fc = fuse_get_context();
const ugid::SetResetGuard ugid(fc->uid,fc->gid);
const rwlock::ReadGuard readlock(&config.srcmountslock);
const ugid::SetResetGuard ugid(fc->uid,fc->gid);
const rwlock::ReadGuard readlock(&config.srcmountslock);
return _setxattr(*config.setxattr,
config.srcmounts,