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| author | Eric W. Biederman <ebiederm@xmission.com> | 2020-05-05 12:12:54 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-05-05 16:46:10 -0400 |
| commit | fa4751f454e6b51ef93babfd8b6c8b43a65c9db2 (patch) | |
| tree | 0333e3b9b52243632a204fc5ffafa63e8329d5a1 | |
| parent | c3b3f52476412a3899f2c65b220075aceb18dd2c (diff) | |
| download | linux-fa4751f454e6b51ef93babfd8b6c8b43a65c9db2.tar.gz linux-fa4751f454e6b51ef93babfd8b6c8b43a65c9db2.tar.bz2 linux-fa4751f454e6b51ef93babfd8b6c8b43a65c9db2.zip | |
binfmt_elf: remove the set_fs in fill_siginfo_note
The code in binfmt_elf.c is differnt from the rest of the code that
processes siginfo, as it sends siginfo from a kernel buffer to a file
rather than from kernel memory to userspace buffers. To remove it's
use of set_fs the code needs some different siginfo helpers.
Add the helper copy_siginfo_to_external to copy from the kernel's
internal siginfo layout to a buffer in the siginfo layout that
userspace expects.
Modify fill_siginfo_note to use copy_siginfo_to_external instead of
set_fs and copy_siginfo_to_user.
Update compat_binfmt_elf.c to use the previously added
copy_siginfo_to_external32 to handle the compat case.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/binfmt_elf.c | 5 | ||||
| -rw-r--r-- | fs/compat_binfmt_elf.c | 2 | ||||
| -rw-r--r-- | include/linux/signal.h | 8 |
3 files changed, 10 insertions, 5 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 13f25e241ac4..a1f57e20c3cf 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1556,10 +1556,7 @@ static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata, const kernel_siginfo_t *siginfo) { - mm_segment_t old_fs = get_fs(); - set_fs(KERNEL_DS); - copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo); - set_fs(old_fs); + copy_siginfo_to_external(csigdata, siginfo); fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); } diff --git a/fs/compat_binfmt_elf.c b/fs/compat_binfmt_elf.c index aaad4ca1217e..fa0e24e1b726 100644 --- a/fs/compat_binfmt_elf.c +++ b/fs/compat_binfmt_elf.c @@ -39,7 +39,7 @@ */ #define user_long_t compat_long_t #define user_siginfo_t compat_siginfo_t -#define copy_siginfo_to_user copy_siginfo_to_user32 +#define copy_siginfo_to_external copy_siginfo_to_external32 /* * The machine-dependent core note format types are defined in elfcore-compat.h, diff --git a/include/linux/signal.h b/include/linux/signal.h index 05bacd2ab135..6bb1a3f0258c 100644 --- a/include/linux/signal.h +++ b/include/linux/signal.h @@ -24,6 +24,14 @@ static inline void clear_siginfo(kernel_siginfo_t *info) #define SI_EXPANSION_SIZE (sizeof(struct siginfo) - sizeof(struct kernel_siginfo)) +static inline void copy_siginfo_to_external(siginfo_t *to, + const kernel_siginfo_t *from) +{ + memcpy(to, from, sizeof(*from)); + memset(((char *)to) + sizeof(struct kernel_siginfo), 0, + SI_EXPANSION_SIZE); +} + int copy_siginfo_to_user(siginfo_t __user *to, const kernel_siginfo_t *from); int copy_siginfo_from_user(kernel_siginfo_t *to, const siginfo_t __user *from); |