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author | Will Deacon <will.deacon@arm.com> | 2012-07-30 23:42:43 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-31 02:25:21 +0200 |
commit | 05ba3f1aa1b04e921068249dd52a80bc84c2aeb4 (patch) | |
tree | 1176cbea1c1272e7f9567d8f2e71c56510f6efcf /arch/alpha | |
parent | ipc: allow compat IPC version field parsing if !ARCH_WANT_OLD_COMPAT_IPC (diff) | |
download | linux-05ba3f1aa1b04e921068249dd52a80bc84c2aeb4.tar.xz linux-05ba3f1aa1b04e921068249dd52a80bc84c2aeb4.zip |
ipc: compat: use signed size_t types for msgsnd and msgrcv
The msgsnd and msgrcv system calls use size_t to represent the size of the
message being transferred. POSIX states that values of msgsz greater than
SSIZE_MAX cause the result to be implementation-defined. On Linux, this
equates to returning -EINVAL if (long) msgsz < 0.
For compat tasks where !CONFIG_ARCH_WANT_OLD_COMPAT_IPC and compat_size_t
is smaller than size_t, negative size values passed from userspace will be
interpreted as positive values by do_msg{rcv,snd} and will fail to exit
early with -EINVAL.
This patch changes the compat prototypes for msg{rcv,snd} so that the
message size is represented as a compat_ssize_t, which we cast to the
native ssize_t type for the core IPC code.
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha')
0 files changed, 0 insertions, 0 deletions