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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 19:18:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 19:18:29 -0700
commit886d7de631da71e30909980fdbf318f7caade262 (patch)
treed79c741b609098ec8c8a3643ba52f26e6a2cd4d1 /fs
parent5bfea2d9b17f1034a68147a8b03b9789af5700f9 (diff)
parent469cbd016157d28c27fda8da6ddc76b856f4e1b9 (diff)
downloadlinux-886d7de631da71e30909980fdbf318f7caade262.tar.bz2
Merge branch 'akpm' (patches from Andrew)
Merge yet more updates from Andrew Morton: - More MM work. 100ish more to go. Mike Rapoport's "mm: remove __ARCH_HAS_5LEVEL_HACK" series should fix the current ppc issue - Various other little subsystems * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (127 commits) lib/ubsan.c: fix gcc-10 warnings tools/testing/selftests/vm: remove duplicate headers selftests: vm: pkeys: fix multilib builds for x86 selftests: vm: pkeys: use the correct page size on powerpc selftests/vm/pkeys: override access right definitions on powerpc selftests/vm/pkeys: test correct behaviour of pkey-0 selftests/vm/pkeys: introduce a sub-page allocator selftests/vm/pkeys: detect write violation on a mapped access-denied-key page selftests/vm/pkeys: associate key on a mapped page and detect write violation selftests/vm/pkeys: associate key on a mapped page and detect access violation selftests/vm/pkeys: improve checks to determine pkey support selftests/vm/pkeys: fix assertion in test_pkey_alloc_exhaust() selftests/vm/pkeys: fix number of reserved powerpc pkeys selftests/vm/pkeys: introduce powerpc support selftests/vm/pkeys: introduce generic pkey abstractions selftests: vm: pkeys: use the correct huge page size selftests/vm/pkeys: fix alloc_random_pkey() to make it really random selftests/vm/pkeys: fix assertion in pkey_disable_set/clear() selftests/vm/pkeys: fix pkey_disable_clear() selftests: vm: pkeys: add helpers for pkey bits ...
Diffstat (limited to 'fs')
-rw-r--r--fs/binfmt_elf.c4
-rw-r--r--fs/binfmt_em86.c6
-rw-r--r--fs/binfmt_misc.c4
-rw-r--r--fs/binfmt_script.c6
-rw-r--r--fs/exec.c52
-rw-r--r--fs/fat/fatent.c103
-rw-r--r--fs/fat/inode.c6
-rw-r--r--fs/proc/array.c8
-rw-r--r--fs/seq_file.c7
9 files changed, 135 insertions, 61 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 44813ceecc47..e5d50bd880e9 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -353,8 +353,6 @@ create_elf_tables(struct linux_binprm *bprm, const struct elfhdr *exec,
return 0;
}
-#ifndef elf_map
-
static unsigned long elf_map(struct file *filep, unsigned long addr,
const struct elf_phdr *eppnt, int prot, int type,
unsigned long total_size)
@@ -394,8 +392,6 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
return(map_addr);
}
-#endif /* !elf_map */
-
static unsigned long total_mapping_size(const struct elf_phdr *cmds, int nr)
{
int i, first_idx = -1, last_idx = -1;
diff --git a/fs/binfmt_em86.c b/fs/binfmt_em86.c
index 995883693cb2..06b9b9fddf70 100644
--- a/fs/binfmt_em86.c
+++ b/fs/binfmt_em86.c
@@ -64,15 +64,15 @@ static int load_em86(struct linux_binprm *bprm)
* user environment and arguments are stored.
*/
remove_arg_zero(bprm);
- retval = copy_strings_kernel(1, &bprm->filename, bprm);
+ retval = copy_string_kernel(bprm->filename, bprm);
if (retval < 0) return retval;
bprm->argc++;
if (i_arg) {
- retval = copy_strings_kernel(1, &i_arg, bprm);
+ retval = copy_string_kernel(i_arg, bprm);
if (retval < 0) return retval;
bprm->argc++;
}
- retval = copy_strings_kernel(1, &i_name, bprm);
+ retval = copy_string_kernel(i_name, bprm);
if (retval < 0) return retval;
bprm->argc++;
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index bc5506619b7e..3880a82da1dc 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -163,13 +163,13 @@ static int load_misc_binary(struct linux_binprm *bprm)
bprm->have_execfd = 1;
/* make argv[1] be the path to the binary */
- retval = copy_strings_kernel(1, &bprm->interp, bprm);
+ retval = copy_string_kernel(bprm->interp, bprm);
if (retval < 0)
goto ret;
bprm->argc++;
/* add the interp as argv[0] */
- retval = copy_strings_kernel(1, &fmt->interpreter, bprm);
+ retval = copy_string_kernel(fmt->interpreter, bprm);
if (retval < 0)
goto ret;
bprm->argc++;
diff --git a/fs/binfmt_script.c b/fs/binfmt_script.c
index 0e8b953d12cf..1b6625e95958 100644
--- a/fs/binfmt_script.c
+++ b/fs/binfmt_script.c
@@ -106,19 +106,19 @@ static int load_script(struct linux_binprm *bprm)
retval = remove_arg_zero(bprm);
if (retval)
return retval;
- retval = copy_strings_kernel(1, &bprm->interp, bprm);
+ retval = copy_string_kernel(bprm->interp, bprm);
if (retval < 0)
return retval;
bprm->argc++;
*((char *)i_end) = '\0';
if (i_arg) {
*((char *)i_sep) = '\0';
- retval = copy_strings_kernel(1, &i_arg, bprm);
+ retval = copy_string_kernel(i_arg, bprm);
if (retval < 0)
return retval;
bprm->argc++;
}
- retval = copy_strings_kernel(1, &i_name, bprm);
+ retval = copy_string_kernel(i_name, bprm);
if (retval)
return retval;
bprm->argc++;
diff --git a/fs/exec.c b/fs/exec.c
index e850ee7dd636..93ff1c4c7ebb 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -590,24 +590,48 @@ out:
}
/*
- * Like copy_strings, but get argv and its values from kernel memory.
+ * Copy and argument/environment string from the kernel to the processes stack.
*/
-int copy_strings_kernel(int argc, const char *const *__argv,
- struct linux_binprm *bprm)
+int copy_string_kernel(const char *arg, struct linux_binprm *bprm)
{
- int r;
- mm_segment_t oldfs = get_fs();
- struct user_arg_ptr argv = {
- .ptr.native = (const char __user *const __user *)__argv,
- };
+ int len = strnlen(arg, MAX_ARG_STRLEN) + 1 /* terminating NUL */;
+ unsigned long pos = bprm->p;
+
+ if (len == 0)
+ return -EFAULT;
+ if (!valid_arg_len(bprm, len))
+ return -E2BIG;
+
+ /* We're going to work our way backwards. */
+ arg += len;
+ bprm->p -= len;
+ if (IS_ENABLED(CONFIG_MMU) && bprm->p < bprm->argmin)
+ return -E2BIG;
- set_fs(KERNEL_DS);
- r = copy_strings(argc, argv, bprm);
- set_fs(oldfs);
+ while (len > 0) {
+ unsigned int bytes_to_copy = min_t(unsigned int, len,
+ min_not_zero(offset_in_page(pos), PAGE_SIZE));
+ struct page *page;
+ char *kaddr;
- return r;
+ pos -= bytes_to_copy;
+ arg -= bytes_to_copy;
+ len -= bytes_to_copy;
+
+ page = get_arg_page(bprm, pos, 1);
+ if (!page)
+ return -E2BIG;
+ kaddr = kmap_atomic(page);
+ flush_arg_page(bprm, pos & PAGE_MASK, page);
+ memcpy(kaddr + offset_in_page(pos), arg, bytes_to_copy);
+ flush_kernel_dcache_page(page);
+ kunmap_atomic(kaddr);
+ put_arg_page(page);
+ }
+
+ return 0;
}
-EXPORT_SYMBOL(copy_strings_kernel);
+EXPORT_SYMBOL(copy_string_kernel);
#ifdef CONFIG_MMU
@@ -1883,7 +1907,7 @@ static int __do_execve_file(int fd, struct filename *filename,
if (retval)
goto out;
- retval = copy_strings_kernel(1, &bprm->filename, bprm);
+ retval = copy_string_kernel(bprm->filename, bprm);
if (retval < 0)
goto out;
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 3647c65a0f48..bbfe18c07417 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -632,20 +632,80 @@ error:
}
EXPORT_SYMBOL_GPL(fat_free_clusters);
-/* 128kb is the whole sectors for FAT12 and FAT16 */
-#define FAT_READA_SIZE (128 * 1024)
+struct fatent_ra {
+ sector_t cur;
+ sector_t limit;
+
+ unsigned int ra_blocks;
+ sector_t ra_advance;
+ sector_t ra_next;
+ sector_t ra_limit;
+};
-static void fat_ent_reada(struct super_block *sb, struct fat_entry *fatent,
- unsigned long reada_blocks)
+static void fat_ra_init(struct super_block *sb, struct fatent_ra *ra,
+ struct fat_entry *fatent, int ent_limit)
{
- const struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
- sector_t blocknr;
- int i, offset;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ const struct fatent_operations *ops = sbi->fatent_ops;
+ sector_t blocknr, block_end;
+ int offset;
+ /*
+ * This is the sequential read, so ra_pages * 2 (but try to
+ * align the optimal hardware IO size).
+ * [BTW, 128kb covers the whole sectors for FAT12 and FAT16]
+ */
+ unsigned long ra_pages = sb->s_bdi->ra_pages;
+ unsigned int reada_blocks;
+ if (ra_pages > sb->s_bdi->io_pages)
+ ra_pages = rounddown(ra_pages, sb->s_bdi->io_pages);
+ reada_blocks = ra_pages << (PAGE_SHIFT - sb->s_blocksize_bits + 1);
+
+ /* Initialize the range for sequential read */
ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
+ ops->ent_blocknr(sb, ent_limit - 1, &offset, &block_end);
+ ra->cur = 0;
+ ra->limit = (block_end + 1) - blocknr;
- for (i = 0; i < reada_blocks; i++)
- sb_breadahead(sb, blocknr + i);
+ /* Advancing the window at half size */
+ ra->ra_blocks = reada_blocks >> 1;
+ ra->ra_advance = ra->cur;
+ ra->ra_next = ra->cur;
+ ra->ra_limit = ra->cur + min_t(sector_t, reada_blocks, ra->limit);
+}
+
+/* Assuming to be called before reading a new block (increments ->cur). */
+static void fat_ent_reada(struct super_block *sb, struct fatent_ra *ra,
+ struct fat_entry *fatent)
+{
+ if (ra->ra_next >= ra->ra_limit)
+ return;
+
+ if (ra->cur >= ra->ra_advance) {
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ const struct fatent_operations *ops = sbi->fatent_ops;
+ struct blk_plug plug;
+ sector_t blocknr, diff;
+ int offset;
+
+ ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
+
+ diff = blocknr - ra->cur;
+ blk_start_plug(&plug);
+ /*
+ * FIXME: we would want to directly use the bio with
+ * pages to reduce the number of segments.
+ */
+ for (; ra->ra_next < ra->ra_limit; ra->ra_next++)
+ sb_breadahead(sb, ra->ra_next + diff);
+ blk_finish_plug(&plug);
+
+ /* Advance the readahead window */
+ ra->ra_advance += ra->ra_blocks;
+ ra->ra_limit += min_t(sector_t,
+ ra->ra_blocks, ra->limit - ra->ra_limit);
+ }
+ ra->cur++;
}
int fat_count_free_clusters(struct super_block *sb)
@@ -653,27 +713,20 @@ int fat_count_free_clusters(struct super_block *sb)
struct msdos_sb_info *sbi = MSDOS_SB(sb);
const struct fatent_operations *ops = sbi->fatent_ops;
struct fat_entry fatent;
- unsigned long reada_blocks, reada_mask, cur_block;
+ struct fatent_ra fatent_ra;
int err = 0, free;
lock_fat(sbi);
if (sbi->free_clusters != -1 && sbi->free_clus_valid)
goto out;
- reada_blocks = FAT_READA_SIZE >> sb->s_blocksize_bits;
- reada_mask = reada_blocks - 1;
- cur_block = 0;
-
free = 0;
fatent_init(&fatent);
fatent_set_entry(&fatent, FAT_START_ENT);
+ fat_ra_init(sb, &fatent_ra, &fatent, sbi->max_cluster);
while (fatent.entry < sbi->max_cluster) {
/* readahead of fat blocks */
- if ((cur_block & reada_mask) == 0) {
- unsigned long rest = sbi->fat_length - cur_block;
- fat_ent_reada(sb, &fatent, min(reada_blocks, rest));
- }
- cur_block++;
+ fat_ent_reada(sb, &fatent_ra, &fatent);
err = fat_ent_read_block(sb, &fatent);
if (err)
@@ -707,9 +760,9 @@ int fat_trim_fs(struct inode *inode, struct fstrim_range *range)
struct msdos_sb_info *sbi = MSDOS_SB(sb);
const struct fatent_operations *ops = sbi->fatent_ops;
struct fat_entry fatent;
+ struct fatent_ra fatent_ra;
u64 ent_start, ent_end, minlen, trimmed = 0;
u32 free = 0;
- unsigned long reada_blocks, reada_mask, cur_block = 0;
int err = 0;
/*
@@ -727,19 +780,13 @@ int fat_trim_fs(struct inode *inode, struct fstrim_range *range)
if (ent_end >= sbi->max_cluster)
ent_end = sbi->max_cluster - 1;
- reada_blocks = FAT_READA_SIZE >> sb->s_blocksize_bits;
- reada_mask = reada_blocks - 1;
-
fatent_init(&fatent);
lock_fat(sbi);
fatent_set_entry(&fatent, ent_start);
+ fat_ra_init(sb, &fatent_ra, &fatent, ent_end + 1);
while (fatent.entry <= ent_end) {
/* readahead of fat blocks */
- if ((cur_block & reada_mask) == 0) {
- unsigned long rest = sbi->fat_length - cur_block;
- fat_ent_reada(sb, &fatent, min(reada_blocks, rest));
- }
- cur_block++;
+ fat_ent_reada(sb, &fatent_ra, &fatent);
err = fat_ent_read_block(sb, &fatent);
if (err)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index e6e68b2274a5..a0cf99debb1e 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1519,6 +1519,12 @@ static int fat_read_bpb(struct super_block *sb, struct fat_boot_sector *b,
goto out;
}
+ if (bpb->fat_fat_length == 0 && bpb->fat32_length == 0) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR, "bogus number of FAT sectors");
+ goto out;
+ }
+
error = 0;
out:
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 043311014db2..713ffac59bbb 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -248,8 +248,8 @@ void render_sigset_t(struct seq_file *m, const char *header,
seq_putc(m, '\n');
}
-static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
- sigset_t *catch)
+static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,
+ sigset_t *sigcatch)
{
struct k_sigaction *k;
int i;
@@ -257,9 +257,9 @@ static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
k = p->sighand->action;
for (i = 1; i <= _NSIG; ++i, ++k) {
if (k->sa.sa_handler == SIG_IGN)
- sigaddset(ign, i);
+ sigaddset(sigign, i);
else if (k->sa.sa_handler != SIG_DFL)
- sigaddset(catch, i);
+ sigaddset(sigcatch, i);
}
}
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 70f5fdf99bf6..4e6239f33c06 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -6,6 +6,8 @@
* initial implementation -- AV, Oct 2001.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/cache.h>
#include <linux/fs.h>
#include <linux/export.h>
@@ -233,9 +235,8 @@ Fill:
p = m->op->next(m, p, &m->index);
if (pos == m->index) {
- pr_info_ratelimited("buggy seq_file .next function %ps "
- "did not updated position index\n",
- m->op->next);
+ pr_info_ratelimited("buggy .next function %ps did not update position index\n",
+ m->op->next);
m->index++;
}
if (!p || IS_ERR(p)) {