diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/genalloc.c | 3 | ||||
| -rw-r--r-- | lib/iov_iter.c | 24 | ||||
| -rw-r--r-- | lib/kstrtox.c | 64 | ||||
| -rw-r--r-- | lib/mpi/mpi-pow.c | 7 | ||||
| -rw-r--r-- | lib/string.c | 29 | ||||
| -rw-r--r-- | lib/strncpy_from_user.c | 2 |
6 files changed, 76 insertions, 53 deletions
diff --git a/lib/genalloc.c b/lib/genalloc.c index 116a166b096f..27aa9c629d13 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -273,7 +273,7 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) struct gen_pool_chunk *chunk; unsigned long addr = 0; int order = pool->min_alloc_order; - int nbits, start_bit = 0, end_bit, remain; + int nbits, start_bit, end_bit, remain; #ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG BUG_ON(in_nmi()); @@ -288,6 +288,7 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) if (size > atomic_read(&chunk->avail)) continue; + start_bit = 0; end_bit = chunk_size(chunk) >> order; retry: start_bit = pool->algo(chunk->bits, end_bit, start_bit, nbits, diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 75232ad0a5e7..daca582a8ed0 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -298,33 +298,13 @@ done: } /* - * Fault in the first iovec of the given iov_iter, to a maximum length - * of bytes. Returns 0 on success, or non-zero if the memory could not be - * accessed (ie. because it is an invalid address). - * - * writev-intensive code may want this to prefault several iovecs -- that - * would be possible (callers must not rely on the fact that _only_ the - * first iovec will be faulted with the current implementation). - */ -int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes) -{ - if (!(i->type & (ITER_BVEC|ITER_KVEC))) { - char __user *buf = i->iov->iov_base + i->iov_offset; - bytes = min(bytes, i->iov->iov_len - i->iov_offset); - return fault_in_pages_readable(buf, bytes); - } - return 0; -} -EXPORT_SYMBOL(iov_iter_fault_in_readable); - -/* * Fault in one or more iovecs of the given iov_iter, to a maximum length of * bytes. For each iovec, fault in each page that constitutes the iovec. * * Return 0 on success, or non-zero if the memory could not be accessed (i.e. * because it is an invalid address). */ -int iov_iter_fault_in_multipages_readable(struct iov_iter *i, size_t bytes) +int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes) { size_t skip = i->iov_offset; const struct iovec *iov; @@ -341,7 +321,7 @@ int iov_iter_fault_in_multipages_readable(struct iov_iter *i, size_t bytes) } return 0; } -EXPORT_SYMBOL(iov_iter_fault_in_multipages_readable); +EXPORT_SYMBOL(iov_iter_fault_in_readable); void iov_iter_init(struct iov_iter *i, int direction, const struct iovec *iov, unsigned long nr_segs, diff --git a/lib/kstrtox.c b/lib/kstrtox.c index 94be244e8441..d8a5cf66c316 100644 --- a/lib/kstrtox.c +++ b/lib/kstrtox.c @@ -321,6 +321,70 @@ int kstrtos8(const char *s, unsigned int base, s8 *res) } EXPORT_SYMBOL(kstrtos8); +/** + * kstrtobool - convert common user inputs into boolean values + * @s: input string + * @res: result + * + * This routine returns 0 iff the first character is one of 'Yy1Nn0', or + * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value + * pointed to by res is updated upon finding a match. + */ +int kstrtobool(const char *s, bool *res) +{ + if (!s) + return -EINVAL; + + switch (s[0]) { + case 'y': + case 'Y': + case '1': + *res = true; + return 0; + case 'n': + case 'N': + case '0': + *res = false; + return 0; + case 'o': + case 'O': + switch (s[1]) { + case 'n': + case 'N': + *res = true; + return 0; + case 'f': + case 'F': + *res = false; + return 0; + default: + break; + } + default: + break; + } + + return -EINVAL; +} +EXPORT_SYMBOL(kstrtobool); + +/* + * Since "base" would be a nonsense argument, this open-codes the + * _from_user helper instead of using the helper macro below. + */ +int kstrtobool_from_user(const char __user *s, size_t count, bool *res) +{ + /* Longest string needed to differentiate, newline, terminator */ + char buf[4]; + + count = min(count, sizeof(buf) - 1); + if (copy_from_user(buf, s, count)) + return -EFAULT; + buf[count] = '\0'; + return kstrtobool(buf, res); +} +EXPORT_SYMBOL(kstrtobool_from_user); + #define kstrto_from_user(f, g, type) \ int f(const char __user *s, size_t count, unsigned int base, type *res) \ { \ diff --git a/lib/mpi/mpi-pow.c b/lib/mpi/mpi-pow.c index 5464c8744ea9..e24388a863a7 100644 --- a/lib/mpi/mpi-pow.c +++ b/lib/mpi/mpi-pow.c @@ -64,8 +64,13 @@ int mpi_powm(MPI res, MPI base, MPI exp, MPI mod) if (!esize) { /* Exponent is zero, result is 1 mod MOD, i.e., 1 or 0 * depending on if MOD equals 1. */ - rp[0] = 1; res->nlimbs = (msize == 1 && mod->d[0] == 1) ? 0 : 1; + if (res->nlimbs) { + if (mpi_resize(res, 1) < 0) + goto enomem; + rp = res->d; + rp[0] = 1; + } res->sign = 0; goto leave; } diff --git a/lib/string.c b/lib/string.c index 0323c0d5629a..1a90db9bc6e1 100644 --- a/lib/string.c +++ b/lib/string.c @@ -630,35 +630,6 @@ bool sysfs_streq(const char *s1, const char *s2) } EXPORT_SYMBOL(sysfs_streq); -/** - * strtobool - convert common user inputs into boolean values - * @s: input string - * @res: result - * - * This routine returns 0 iff the first character is one of 'Yy1Nn0'. - * Otherwise it will return -EINVAL. Value pointed to by res is - * updated upon finding a match. - */ -int strtobool(const char *s, bool *res) -{ - switch (s[0]) { - case 'y': - case 'Y': - case '1': - *res = true; - break; - case 'n': - case 'N': - case '0': - *res = false; - break; - default: - return -EINVAL; - } - return 0; -} -EXPORT_SYMBOL(strtobool); - #ifndef __HAVE_ARCH_MEMSET /** * memset - Fill a region of memory with the given value diff --git a/lib/strncpy_from_user.c b/lib/strncpy_from_user.c index 06ebe4efa1f2..b4aacfc0b4b3 100644 --- a/lib/strncpy_from_user.c +++ b/lib/strncpy_from_user.c @@ -1,5 +1,6 @@ #include <linux/compiler.h> #include <linux/export.h> +#include <linux/thread_info.h> #include <linux/uaccess.h> #include <linux/kernel.h> #include <linux/errno.h> @@ -126,6 +127,7 @@ long strncpy_from_user(char *dst, const char __user *src, long count) unsigned long max = max_addr - src_addr; long retval; + check_object_size(dst, count, false); user_access_begin(); retval = do_strncpy_from_user(dst, src, count, max); user_access_end(); |