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Fix faccessat(2) not reporting correct permissions.

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This commit is contained in:
Jonas 'Sortie' Termansen 2015-09-28 01:57:22 +02:00
parent 4c2a93ea02
commit 875ce1adf7
1 changed files with 24 additions and 3 deletions
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27
kernel/io.cpp
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@ -38,6 +38,7 @@
#include <sortix/stat.h>
#include <sortix/statvfs.h>
#include <sortix/uio.h>
#include <sortix/unistd.h>
#include <sortix/kernel/copy.h>
#include <sortix/kernel/descriptor.h>
@ -192,11 +193,12 @@ int sys_openat(int dirfd, const char* path, int flags, mode_t mode)
return ret;
}
// TODO: This is a hack! Stat the file in some manner and check permissions.
int sys_faccessat(int dirfd, const char* path, int /*mode*/, int flags)
int sys_faccessat(int dirfd, const char* path, int mode, int flags)
{
if ( flags & ~(AT_SYMLINK_NOFOLLOW | AT_EACCESS) )
return errno = EINVAL, -1;
if ( mode & ~(X_OK | W_OK | R_OK) )
return errno = EINVAL, -1;
char* pathcopy = GetStringFromUser(path);
if ( !pathcopy )
return -1;
@ -206,7 +208,26 @@ int sys_faccessat(int dirfd, const char* path, int /*mode*/, int flags)
int open_flags = O_READ | (flags & AT_SYMLINK_NOFOLLOW ? O_SYMLINK_NOFOLLOW : 0);
Ref<Descriptor> desc = from->open(&ctx, pathcopy, open_flags);
delete[] pathcopy;
return desc ? 0 : -1;
if ( !desc )
return -1;
ioctx_t kctx; SetupKernelIOCtx(&kctx);
struct stat st;
if ( desc->stat(&kctx, &st) < 0 )
return -1;
mode_t mask;
if ( kctx.uid == st.st_uid )
mask = 0700;
else if ( kctx.gid == st.st_gid )
mask = 0070;
else
mask = 0007;
if ( (mode & X_OK) && !(st.st_mode & 0111 & mask) )
return errno = EACCES, -1;
if ( (mode & W_OK) && !(st.st_mode & 0222 & mask) )
return errno = EACCES, -1;
if ( (mode & R_OK) && !(st.st_mode & 0444 & mask) )
return errno = EACCES, -1;
return 0;
}
int sys_unlinkat(int dirfd, const char* path, int flags)