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Diffstat (limited to 'fs/readdir.c')
-rw-r--r--fs/readdir.c89
1 files changed, 45 insertions, 44 deletions
diff --git a/fs/readdir.c b/fs/readdir.c
index 278bc0254732..7764b8638978 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -22,8 +22,6 @@
#include <linux/compat.h>
#include <linux/uaccess.h>
-#include <asm/unaligned.h>
-
/*
* Some filesystems were never converted to '->iterate_shared()'
* and their directory iterators want the inode lock held for
@@ -72,7 +70,7 @@ int wrap_directory_iterator(struct file *file,
EXPORT_SYMBOL(wrap_directory_iterator);
/*
- * Note the "unsafe_put_user() semantics: we goto a
+ * Note the "unsafe_put_user()" semantics: we goto a
* label for errors.
*/
#define unsafe_copy_dirent_name(_dst, _src, _len, label) do { \
@@ -221,20 +219,20 @@ SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
struct old_linux_dirent __user *, dirent, unsigned int, count)
{
int error;
- struct fd f = fdget_pos(fd);
+ CLASS(fd_pos, f)(fd);
struct readdir_callback buf = {
.ctx.actor = fillonedir,
+ .ctx.count = 1, /* Hint to fs: just one entry. */
.dirent = dirent
};
- if (!f.file)
+ if (fd_empty(f))
return -EBADF;
- error = iterate_dir(f.file, &buf.ctx);
+ error = iterate_dir(fd_file(f), &buf.ctx);
if (buf.result)
error = buf.result;
- fdput_pos(f);
return error;
}
@@ -255,7 +253,6 @@ struct getdents_callback {
struct dir_context ctx;
struct linux_dirent __user * current_dir;
int prev_reclen;
- int count;
int error;
};
@@ -269,12 +266,16 @@ static bool filldir(struct dir_context *ctx, const char *name, int namlen,
int reclen = ALIGN(offsetof(struct linux_dirent, d_name) + namlen + 2,
sizeof(long));
int prev_reclen;
+ unsigned int flags = d_type;
+
+ BUILD_BUG_ON(FILLDIR_FLAG_NOINTR & S_DT_MASK);
+ d_type &= S_DT_MASK;
buf->error = verify_dirent_name(name, namlen);
if (unlikely(buf->error))
return false;
buf->error = -EINVAL; /* only used if we fail.. */
- if (reclen > buf->count)
+ if (reclen > ctx->count)
return false;
d_ino = ino;
if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
@@ -282,7 +283,7 @@ static bool filldir(struct dir_context *ctx, const char *name, int namlen,
return false;
}
prev_reclen = buf->prev_reclen;
- if (prev_reclen && signal_pending(current))
+ if (!(flags & FILLDIR_FLAG_NOINTR) && prev_reclen && signal_pending(current))
return false;
dirent = buf->current_dir;
prev = (void __user *) dirent - prev_reclen;
@@ -299,7 +300,7 @@ static bool filldir(struct dir_context *ctx, const char *name, int namlen,
buf->current_dir = (void __user *)dirent + reclen;
buf->prev_reclen = reclen;
- buf->count -= reclen;
+ ctx->count -= reclen;
return true;
efault_end:
user_write_access_end();
@@ -311,19 +312,18 @@ efault:
SYSCALL_DEFINE3(getdents, unsigned int, fd,
struct linux_dirent __user *, dirent, unsigned int, count)
{
- struct fd f;
+ CLASS(fd_pos, f)(fd);
struct getdents_callback buf = {
.ctx.actor = filldir,
- .count = count,
+ .ctx.count = count,
.current_dir = dirent
};
int error;
- f = fdget_pos(fd);
- if (!f.file)
+ if (fd_empty(f))
return -EBADF;
- error = iterate_dir(f.file, &buf.ctx);
+ error = iterate_dir(fd_file(f), &buf.ctx);
if (error >= 0)
error = buf.error;
if (buf.prev_reclen) {
@@ -333,9 +333,8 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
if (put_user(buf.ctx.pos, &lastdirent->d_off))
error = -EFAULT;
else
- error = count - buf.count;
+ error = count - buf.ctx.count;
}
- fdput_pos(f);
return error;
}
@@ -343,7 +342,6 @@ struct getdents_callback64 {
struct dir_context ctx;
struct linux_dirent64 __user * current_dir;
int prev_reclen;
- int count;
int error;
};
@@ -356,15 +354,19 @@ static bool filldir64(struct dir_context *ctx, const char *name, int namlen,
int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
sizeof(u64));
int prev_reclen;
+ unsigned int flags = d_type;
+
+ BUILD_BUG_ON(FILLDIR_FLAG_NOINTR & S_DT_MASK);
+ d_type &= S_DT_MASK;
buf->error = verify_dirent_name(name, namlen);
if (unlikely(buf->error))
return false;
buf->error = -EINVAL; /* only used if we fail.. */
- if (reclen > buf->count)
+ if (reclen > ctx->count)
return false;
prev_reclen = buf->prev_reclen;
- if (prev_reclen && signal_pending(current))
+ if (!(flags & FILLDIR_FLAG_NOINTR) && prev_reclen && signal_pending(current))
return false;
dirent = buf->current_dir;
prev = (void __user *)dirent - prev_reclen;
@@ -381,7 +383,7 @@ static bool filldir64(struct dir_context *ctx, const char *name, int namlen,
buf->prev_reclen = reclen;
buf->current_dir = (void __user *)dirent + reclen;
- buf->count -= reclen;
+ ctx->count -= reclen;
return true;
efault_end:
@@ -394,19 +396,18 @@ efault:
SYSCALL_DEFINE3(getdents64, unsigned int, fd,
struct linux_dirent64 __user *, dirent, unsigned int, count)
{
- struct fd f;
+ CLASS(fd_pos, f)(fd);
struct getdents_callback64 buf = {
.ctx.actor = filldir64,
- .count = count,
+ .ctx.count = count,
.current_dir = dirent
};
int error;
- f = fdget_pos(fd);
- if (!f.file)
+ if (fd_empty(f))
return -EBADF;
- error = iterate_dir(f.file, &buf.ctx);
+ error = iterate_dir(fd_file(f), &buf.ctx);
if (error >= 0)
error = buf.error;
if (buf.prev_reclen) {
@@ -417,9 +418,8 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
if (put_user(d_off, &lastdirent->d_off))
error = -EFAULT;
else
- error = count - buf.count;
+ error = count - buf.ctx.count;
}
- fdput_pos(f);
return error;
}
@@ -479,20 +479,20 @@ COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
{
int error;
- struct fd f = fdget_pos(fd);
+ CLASS(fd_pos, f)(fd);
struct compat_readdir_callback buf = {
.ctx.actor = compat_fillonedir,
+ .ctx.count = 1, /* Hint to fs: just one entry. */
.dirent = dirent
};
- if (!f.file)
+ if (fd_empty(f))
return -EBADF;
- error = iterate_dir(f.file, &buf.ctx);
+ error = iterate_dir(fd_file(f), &buf.ctx);
if (buf.result)
error = buf.result;
- fdput_pos(f);
return error;
}
@@ -507,7 +507,6 @@ struct compat_getdents_callback {
struct dir_context ctx;
struct compat_linux_dirent __user *current_dir;
int prev_reclen;
- int count;
int error;
};
@@ -521,12 +520,16 @@ static bool compat_filldir(struct dir_context *ctx, const char *name, int namlen
int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
namlen + 2, sizeof(compat_long_t));
int prev_reclen;
+ unsigned int flags = d_type;
+
+ BUILD_BUG_ON(FILLDIR_FLAG_NOINTR & S_DT_MASK);
+ d_type &= S_DT_MASK;
buf->error = verify_dirent_name(name, namlen);
if (unlikely(buf->error))
return false;
buf->error = -EINVAL; /* only used if we fail.. */
- if (reclen > buf->count)
+ if (reclen > ctx->count)
return false;
d_ino = ino;
if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
@@ -534,7 +537,7 @@ static bool compat_filldir(struct dir_context *ctx, const char *name, int namlen
return false;
}
prev_reclen = buf->prev_reclen;
- if (prev_reclen && signal_pending(current))
+ if (!(flags & FILLDIR_FLAG_NOINTR) && prev_reclen && signal_pending(current))
return false;
dirent = buf->current_dir;
prev = (void __user *) dirent - prev_reclen;
@@ -550,7 +553,7 @@ static bool compat_filldir(struct dir_context *ctx, const char *name, int namlen
buf->prev_reclen = reclen;
buf->current_dir = (void __user *)dirent + reclen;
- buf->count -= reclen;
+ ctx->count -= reclen;
return true;
efault_end:
user_write_access_end();
@@ -562,19 +565,18 @@ efault:
COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
struct compat_linux_dirent __user *, dirent, unsigned int, count)
{
- struct fd f;
+ CLASS(fd_pos, f)(fd);
struct compat_getdents_callback buf = {
.ctx.actor = compat_filldir,
+ .ctx.count = count,
.current_dir = dirent,
- .count = count
};
int error;
- f = fdget_pos(fd);
- if (!f.file)
+ if (fd_empty(f))
return -EBADF;
- error = iterate_dir(f.file, &buf.ctx);
+ error = iterate_dir(fd_file(f), &buf.ctx);
if (error >= 0)
error = buf.error;
if (buf.prev_reclen) {
@@ -584,9 +586,8 @@ COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
if (put_user(buf.ctx.pos, &lastdirent->d_off))
error = -EFAULT;
else
- error = count - buf.count;
+ error = count - buf.ctx.count;
}
- fdput_pos(f);
return error;
}
#endif
generated by cgit (git 2.34.1) at 2025-07-10 04:43:18 +0000